Lire / écrire dans le registre de Windows en utilisant Java

je sais que cette question Est ancienne, mais c'est le premier résultat de recherche sur google à"java read/write to registry". Récemment, j'ai trouvé cet incroyable morceau de code qui:

• peut lire/écrire dans N'importe quelle partie du registre.
• N'UTILISE PAS JNI.
• N'utilise pas d'APPLICATIONS externes pour fonctionner.
• N'utilise pas L'API WINDOWS (directement)

This est pur, le code Java.

il utilise la réflexion pour travailler, en accédant effectivement aux méthodes privées de la classe java.util.prefs.Preferences . L'intérieur de cette classe sont compliquées, mais la classe elle-même est très facile à utiliser.

par exemple, le code suivant obtient la distribution exacte de windows du registre :

String value = WinRegistry.readString (
    WinRegistry.HKEY_LOCAL_MACHINE,                             //HKEY
   "SOFTWARE\Microsoft\Windows NT\CurrentVersion",           //Key
   "ProductName");                                              //ValueName
    System.out.println("Windows Distribution = " + value);          

Voici la classe originale. Il suffit de copier le coller et il devrait fonctionner:

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.ArrayList;
import java.util.List;
import java.util.prefs.Preferences;

public class WinRegistry {
  public static final int HKEY_CURRENT_USER = 0x80000001;
  public static final int HKEY_LOCAL_MACHINE = 0x80000002;
  public static final int REG_SUCCESS = 0;
  public static final int REG_NOTFOUND = 2;
  public static final int REG_ACCESSDENIED = 5;

  private static final int KEY_ALL_ACCESS = 0xf003f;
  private static final int KEY_READ = 0x20019;
  private static final Preferences userRoot = Preferences.userRoot();
  private static final Preferences systemRoot = Preferences.systemRoot();
  private static final Class<? extends Preferences> userClass = userRoot.getClass();
  private static final Method regOpenKey;
  private static final Method regCloseKey;
  private static final Method regQueryValueEx;
  private static final Method regEnumValue;
  private static final Method regQueryInfoKey;
  private static final Method regEnumKeyEx;
  private static final Method regCreateKeyEx;
  private static final Method regSetValueEx;
  private static final Method regDeleteKey;
  private static final Method regDeleteValue;

  static {
    try {
      regOpenKey = userClass.getDeclaredMethod("WindowsRegOpenKey",
          new Class[] { int.class, byte[].class, int.class });
      regOpenKey.setAccessible(true);
      regCloseKey = userClass.getDeclaredMethod("WindowsRegCloseKey",
          new Class[] { int.class });
      regCloseKey.setAccessible(true);
      regQueryValueEx = userClass.getDeclaredMethod("WindowsRegQueryValueEx",
          new Class[] { int.class, byte[].class });
      regQueryValueEx.setAccessible(true);
      regEnumValue = userClass.getDeclaredMethod("WindowsRegEnumValue",
          new Class[] { int.class, int.class, int.class });
      regEnumValue.setAccessible(true);
      regQueryInfoKey = userClass.getDeclaredMethod("WindowsRegQueryInfoKey1",
          new Class[] { int.class });
      regQueryInfoKey.setAccessible(true);
      regEnumKeyEx = userClass.getDeclaredMethod(  
          "WindowsRegEnumKeyEx", new Class[] { int.class, int.class,  
              int.class });  
      regEnumKeyEx.setAccessible(true);
      regCreateKeyEx = userClass.getDeclaredMethod(  
          "WindowsRegCreateKeyEx", new Class[] { int.class,  
              byte[].class });  
      regCreateKeyEx.setAccessible(true);  
      regSetValueEx = userClass.getDeclaredMethod(  
          "WindowsRegSetValueEx", new Class[] { int.class,  
              byte[].class, byte[].class });  
      regSetValueEx.setAccessible(true); 
      regDeleteValue = userClass.getDeclaredMethod(  
          "WindowsRegDeleteValue", new Class[] { int.class,  
              byte[].class });  
      regDeleteValue.setAccessible(true); 
      regDeleteKey = userClass.getDeclaredMethod(  
          "WindowsRegDeleteKey", new Class[] { int.class,  
              byte[].class });  
      regDeleteKey.setAccessible(true); 
    }
    catch (Exception e) {
      throw new RuntimeException(e);
    }
  }

  private WinRegistry() {  }

  /**
   * Read a value from key and value name
   * @param hkey   HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @param valueName
   * @return the value
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static String readString(int hkey, String key, String valueName) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      return readString(systemRoot, hkey, key, valueName);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      return readString(userRoot, hkey, key, valueName);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Read value(s) and value name(s) form given key 
   * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @return the value name(s) plus the value(s)
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static Map<String, String> readStringValues(int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      return readStringValues(systemRoot, hkey, key);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      return readStringValues(userRoot, hkey, key);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Read the value name(s) from a given key
   * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @return the value name(s)
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static List<String> readStringSubKeys(int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      return readStringSubKeys(systemRoot, hkey, key);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      return readStringSubKeys(userRoot, hkey, key);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Create a key
   * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void createKey(int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    int [] ret;
    if (hkey == HKEY_LOCAL_MACHINE) {
      ret = createKey(systemRoot, hkey, key);
      regCloseKey.invoke(systemRoot, new Object[] { new Integer(ret[0]) });
    }
    else if (hkey == HKEY_CURRENT_USER) {
      ret = createKey(userRoot, hkey, key);
      regCloseKey.invoke(userRoot, new Object[] { new Integer(ret[0]) });
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
    if (ret[1] != REG_SUCCESS) {
      throw new IllegalArgumentException("rc=" + ret[1] + "  key=" + key);
    }
  }

  /**
   * Write a value in a given key/value name
   * @param hkey
   * @param key
   * @param valueName
   * @param value
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void writeStringValue
    (int hkey, String key, String valueName, String value) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      writeStringValue(systemRoot, hkey, key, valueName, value);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      writeStringValue(userRoot, hkey, key, valueName, value);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Delete a given key
   * @param hkey
   * @param key
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void deleteKey(int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    int rc = -1;
    if (hkey == HKEY_LOCAL_MACHINE) {
      rc = deleteKey(systemRoot, hkey, key);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      rc = deleteKey(userRoot, hkey, key);
    }
    if (rc != REG_SUCCESS) {
      throw new IllegalArgumentException("rc=" + rc + "  key=" + key);
    }
  }

  /**
   * delete a value from a given key/value name
   * @param hkey
   * @param key
   * @param value
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void deleteValue(int hkey, String key, String value) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    int rc = -1;
    if (hkey == HKEY_LOCAL_MACHINE) {
      rc = deleteValue(systemRoot, hkey, key, value);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      rc = deleteValue(userRoot, hkey, key, value);
    }
    if (rc != REG_SUCCESS) {
      throw new IllegalArgumentException("rc=" + rc + "  key=" + key + "  value=" + value);
    }
  }

  // =====================

  private static int deleteValue
    (Preferences root, int hkey, String key, String value)
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_ALL_ACCESS) });
    if (handles[1] != REG_SUCCESS) {
      return handles[1];  // can be REG_NOTFOUND, REG_ACCESSDENIED
    }
    int rc =((Integer) regDeleteValue.invoke(root,  
        new Object[] { 
          new Integer(handles[0]), toCstr(value) 
          })).intValue();
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return rc;
  }

  private static int deleteKey(Preferences root, int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    int rc =((Integer) regDeleteKey.invoke(root,  
        new Object[] { new Integer(hkey), toCstr(key) })).intValue();
    return rc;  // can REG_NOTFOUND, REG_ACCESSDENIED, REG_SUCCESS
  }

  private static String readString(Preferences root, int hkey, String key, String value)
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_READ) });
    if (handles[1] != REG_SUCCESS) {
      return null; 
    }
    byte[] valb = (byte[]) regQueryValueEx.invoke(root, new Object[] {
        new Integer(handles[0]), toCstr(value) });
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return (valb != null ? new String(valb).trim() : null);
  }

  private static Map<String,String> readStringValues
    (Preferences root, int hkey, String key)
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    HashMap<String, String> results = new HashMap<String,String>();
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_READ) });
    if (handles[1] != REG_SUCCESS) {
      return null;
    }
    int[] info = (int[]) regQueryInfoKey.invoke(root,
        new Object[] { new Integer(handles[0]) });

    int count = info[0]; // count  
    int maxlen = info[3]; // value length max
    for(int index=0; index<count; index++)  {
      byte[] name = (byte[]) regEnumValue.invoke(root, new Object[] {
          new Integer
            (handles[0]), new Integer(index), new Integer(maxlen + 1)});
      String value = readString(hkey, key, new String(name));
      results.put(new String(name).trim(), value);
    }
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return results;
  }

  private static List<String> readStringSubKeys
    (Preferences root, int hkey, String key)
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    List<String> results = new ArrayList<String>();
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_READ) 
        });
    if (handles[1] != REG_SUCCESS) {
      return null;
    }
    int[] info = (int[]) regQueryInfoKey.invoke(root,
        new Object[] { new Integer(handles[0]) });

    int count  = info[0]; // Fix: info[2] was being used here with wrong results. Suggested by davenpcj, confirmed by Petrucio
    int maxlen = info[3]; // value length max
    for(int index=0; index<count; index++)  {
      byte[] name = (byte[]) regEnumKeyEx.invoke(root, new Object[] {
          new Integer
            (handles[0]), new Integer(index), new Integer(maxlen + 1)
          });
      results.add(new String(name).trim());
    }
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return results;
  }

  private static int [] createKey(Preferences root, int hkey, String key)
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    return  (int[]) regCreateKeyEx.invoke(root,
        new Object[] { new Integer(hkey), toCstr(key) });
  }

  private static void writeStringValue 
    (Preferences root, int hkey, String key, String valueName, String value) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_ALL_ACCESS) });

    regSetValueEx.invoke(root,  
        new Object[] { 
          new Integer(handles[0]), toCstr(valueName), toCstr(value) 
          }); 
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
  }

  // utility
  private static byte[] toCstr(String str) {
    byte[] result = new byte[str.length() + 1];

    for (int i = 0; i < str.length(); i++) {
      result[i] = (byte) str.charAt(i);
    }
    result[str.length()] = 0;
    return result;
  }
}

j'ai été incapable de trouver et de donner crédit à l'auteur original de ce code. Si vous trouvez des détails, veuillez ajouter un commentaire et je l'ajouterai ici.

vous n'avez pas vraiment besoin d'un paquet tiers. Windows a un utilitaire reg pour toutes les opérations de registre. Pour obtenir la commande format, allez sur le dos propmt et tapez:

reg /?

Vous pouvez appeler reg par le biais de la classe d'Exécution:

Runtime.getRuntime().exec("reg <your parameters here>");

éditer des clés et en ajouter de nouvelles est simple en utilisant la commande ci-dessus. Pour lire le registre, vous devez obtenir la sortie reg , et c'est un peu délicate. Voici le code:

import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;

/**
 * @author Oleg Ryaboy, based on work by Miguel Enriquez 
 */
public class WindowsReqistry {

    /**
     * 
     * @param location path in the registry
     * @param key registry key
     * @return registry value or null if not found
     */
    public static final String readRegistry(String location, String key){
        try {
            // Run reg query, then read output with StreamReader (internal class)
            Process process = Runtime.getRuntime().exec("reg query " + 
                    '"'+ location + "\" /v " + key);

            StreamReader reader = new StreamReader(process.getInputStream());
            reader.start();
            process.waitFor();
            reader.join();
            String output = reader.getResult();

            // Output has the following format:
            // \n<Version information>\n\n<key>\t<registry type>\t<value>
            if( ! output.contains("\t")){
                    return null;
            }

            // Parse out the value
            String[] parsed = output.split("\t");
            return parsed[parsed.length-1];
        }
        catch (Exception e) {
            return null;
        }

    }

    static class StreamReader extends Thread {
        private InputStream is;
        private StringWriter sw= new StringWriter();

        public StreamReader(InputStream is) {
            this.is = is;
        }

        public void run() {
            try {
                int c;
                while ((c = is.read()) != -1)
                    sw.write(c);
            }
            catch (IOException e) { 
        }
        }

        public String getResult() {
            return sw.toString();
        }
    }
    public static void main(String[] args) {

        // Sample usage
        String value = WindowsReqistry.readRegistry("HKCU\Software\Microsoft\Windows\CurrentVersion\" 
                 + "Explorer\Shell Folders", "Personal");
        System.out.println(value);
    }
}

Java Native Access (JNA) est un excellent projet pour travailler avec les bibliothèques natives et a le soutien pour le registre de Windows dans la bibliothèque plate-forme (plate-forme.jar) par Advapi32Util et Advapi32 .

mise à jour: voici un extrait avec quelques exemples de la façon dont il est facile d'utiliser JNA pour travailler avec le registre de Windows en utilisant JNA 3.4.1,

import com.sun.jna.platform.win32.Advapi32Util;
import com.sun.jna.platform.win32.WinReg;

public class WindowsRegistrySnippet {
    public static void main(String[] args) {
        // Read a string
        String productName = Advapi32Util.registryGetStringValue(
            WinReg.HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows NT\CurrentVersion", "ProductName");
        System.out.printf("Product Name: %s\n", productName);

        // Read an int (& 0xFFFFFFFFL for large unsigned int)
        int timeout = Advapi32Util.registryGetIntValue(
            WinReg.HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows", "ShutdownWarningDialogTimeout");
        System.out.printf("Shutdown Warning Dialog Timeout: %d (%d as unsigned long)\n", timeout, timeout & 0xFFFFFFFFL);

        // Create a key and write a string
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "SOFTWARE\StackOverflow");
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER, "SOFTWARE\StackOverflow", "url", "http://stackoverflow.com/a/6287763/277307");

        // Delete a key
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "SOFTWARE\StackOverflow");
    }
}

j'ai incrémenté le code java pur Initialement posté par David pour permettre l'accès à la section 32 bits du Registre à partir d'une JVM 64 bits, et vice-versa. Je ne pense pas que les autres réponses traitent de ça.

le voici:

/**
 * Pure Java Windows Registry access.
 * Modified by petrucio@stackoverflow(828681) to add support for
 * reading (and writing but not creating/deleting keys) the 32-bits
 * registry view from a 64-bits JVM (KEY_WOW64_32KEY)
 * and 64-bits view from a 32-bits JVM (KEY_WOW64_64KEY).
 *****************************************************************************/

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.ArrayList;
import java.util.List;
import java.util.prefs.Preferences;

public class WinRegistry {
  public static final int HKEY_CURRENT_USER = 0x80000001;
  public static final int HKEY_LOCAL_MACHINE = 0x80000002;
  public static final int REG_SUCCESS = 0;
  public static final int REG_NOTFOUND = 2;
  public static final int REG_ACCESSDENIED = 5;

  public static final int KEY_WOW64_32KEY = 0x0200;
  public static final int KEY_WOW64_64KEY = 0x0100;

  private static final int KEY_ALL_ACCESS = 0xf003f;
  private static final int KEY_READ = 0x20019;
  private static Preferences userRoot = Preferences.userRoot();
  private static Preferences systemRoot = Preferences.systemRoot();
  private static Class<? extends Preferences> userClass = userRoot.getClass();
  private static Method regOpenKey = null;
  private static Method regCloseKey = null;
  private static Method regQueryValueEx = null;
  private static Method regEnumValue = null;
  private static Method regQueryInfoKey = null;
  private static Method regEnumKeyEx = null;
  private static Method regCreateKeyEx = null;
  private static Method regSetValueEx = null;
  private static Method regDeleteKey = null;
  private static Method regDeleteValue = null;

  static {
    try {
      regOpenKey     = userClass.getDeclaredMethod("WindowsRegOpenKey",     new Class[] { int.class, byte[].class, int.class });
      regOpenKey.setAccessible(true);
      regCloseKey    = userClass.getDeclaredMethod("WindowsRegCloseKey",    new Class[] { int.class });
      regCloseKey.setAccessible(true);
      regQueryValueEx= userClass.getDeclaredMethod("WindowsRegQueryValueEx",new Class[] { int.class, byte[].class });
      regQueryValueEx.setAccessible(true);
      regEnumValue   = userClass.getDeclaredMethod("WindowsRegEnumValue",   new Class[] { int.class, int.class, int.class });
      regEnumValue.setAccessible(true);
      regQueryInfoKey=userClass.getDeclaredMethod("WindowsRegQueryInfoKey1",new Class[] { int.class });
      regQueryInfoKey.setAccessible(true);
      regEnumKeyEx   = userClass.getDeclaredMethod("WindowsRegEnumKeyEx",   new Class[] { int.class, int.class, int.class });  
      regEnumKeyEx.setAccessible(true);
      regCreateKeyEx = userClass.getDeclaredMethod("WindowsRegCreateKeyEx", new Class[] { int.class, byte[].class });
      regCreateKeyEx.setAccessible(true);  
      regSetValueEx  = userClass.getDeclaredMethod("WindowsRegSetValueEx",  new Class[] { int.class, byte[].class, byte[].class });  
      regSetValueEx.setAccessible(true); 
      regDeleteValue = userClass.getDeclaredMethod("WindowsRegDeleteValue", new Class[] { int.class, byte[].class });  
      regDeleteValue.setAccessible(true); 
      regDeleteKey   = userClass.getDeclaredMethod("WindowsRegDeleteKey",   new Class[] { int.class, byte[].class });  
      regDeleteKey.setAccessible(true); 
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  private WinRegistry() {  }

  /**
   * Read a value from key and value name
   * @param hkey   HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @param valueName
   * @param wow64  0 for standard registry access (32-bits for 32-bit app, 64-bits for 64-bits app)
   *               or KEY_WOW64_32KEY to force access to 32-bit registry view,
   *               or KEY_WOW64_64KEY to force access to 64-bit registry view
   * @return the value
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static String readString(int hkey, String key, String valueName, int wow64) 
    throws IllegalArgumentException, IllegalAccessException,
    InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      return readString(systemRoot, hkey, key, valueName, wow64);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      return readString(userRoot, hkey, key, valueName, wow64);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Read value(s) and value name(s) form given key 
   * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @param wow64  0 for standard registry access (32-bits for 32-bit app, 64-bits for 64-bits app)
   *               or KEY_WOW64_32KEY to force access to 32-bit registry view,
   *               or KEY_WOW64_64KEY to force access to 64-bit registry view
   * @return the value name(s) plus the value(s)
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static Map<String, String> readStringValues(int hkey, String key, int wow64) 
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      return readStringValues(systemRoot, hkey, key, wow64);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      return readStringValues(userRoot, hkey, key, wow64);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Read the value name(s) from a given key
   * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @param wow64  0 for standard registry access (32-bits for 32-bit app, 64-bits for 64-bits app)
   *               or KEY_WOW64_32KEY to force access to 32-bit registry view,
   *               or KEY_WOW64_64KEY to force access to 64-bit registry view
   * @return the value name(s)
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static List<String> readStringSubKeys(int hkey, String key, int wow64) 
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      return readStringSubKeys(systemRoot, hkey, key, wow64);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      return readStringSubKeys(userRoot, hkey, key, wow64);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Create a key
   * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
   * @param key
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void createKey(int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    int [] ret;
    if (hkey == HKEY_LOCAL_MACHINE) {
      ret = createKey(systemRoot, hkey, key);
      regCloseKey.invoke(systemRoot, new Object[] { new Integer(ret[0]) });
    }
    else if (hkey == HKEY_CURRENT_USER) {
      ret = createKey(userRoot, hkey, key);
      regCloseKey.invoke(userRoot, new Object[] { new Integer(ret[0]) });
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
    if (ret[1] != REG_SUCCESS) {
      throw new IllegalArgumentException("rc=" + ret[1] + "  key=" + key);
    }
  }

  /**
   * Write a value in a given key/value name
   * @param hkey
   * @param key
   * @param valueName
   * @param value
   * @param wow64  0 for standard registry access (32-bits for 32-bit app, 64-bits for 64-bits app)
   *               or KEY_WOW64_32KEY to force access to 32-bit registry view,
   *               or KEY_WOW64_64KEY to force access to 64-bit registry view
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void writeStringValue
    (int hkey, String key, String valueName, String value, int wow64) 
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    if (hkey == HKEY_LOCAL_MACHINE) {
      writeStringValue(systemRoot, hkey, key, valueName, value, wow64);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      writeStringValue(userRoot, hkey, key, valueName, value, wow64);
    }
    else {
      throw new IllegalArgumentException("hkey=" + hkey);
    }
  }

  /**
   * Delete a given key
   * @param hkey
   * @param key
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void deleteKey(int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    int rc = -1;
    if (hkey == HKEY_LOCAL_MACHINE) {
      rc = deleteKey(systemRoot, hkey, key);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      rc = deleteKey(userRoot, hkey, key);
    }
    if (rc != REG_SUCCESS) {
      throw new IllegalArgumentException("rc=" + rc + "  key=" + key);
    }
  }

  /**
   * delete a value from a given key/value name
   * @param hkey
   * @param key
   * @param value
   * @param wow64  0 for standard registry access (32-bits for 32-bit app, 64-bits for 64-bits app)
   *               or KEY_WOW64_32KEY to force access to 32-bit registry view,
   *               or KEY_WOW64_64KEY to force access to 64-bit registry view
   * @throws IllegalArgumentException
   * @throws IllegalAccessException
   * @throws InvocationTargetException
   */
  public static void deleteValue(int hkey, String key, String value, int wow64) 
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    int rc = -1;
    if (hkey == HKEY_LOCAL_MACHINE) {
      rc = deleteValue(systemRoot, hkey, key, value, wow64);
    }
    else if (hkey == HKEY_CURRENT_USER) {
      rc = deleteValue(userRoot, hkey, key, value, wow64);
    }
    if (rc != REG_SUCCESS) {
      throw new IllegalArgumentException("rc=" + rc + "  key=" + key + "  value=" + value);
    }
  }

  //========================================================================
  private static int deleteValue(Preferences root, int hkey, String key, String value, int wow64)
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_ALL_ACCESS | wow64)
    });
    if (handles[1] != REG_SUCCESS) {
      return handles[1];  // can be REG_NOTFOUND, REG_ACCESSDENIED
    }
    int rc =((Integer) regDeleteValue.invoke(root, new Object[] { 
          new Integer(handles[0]), toCstr(value) 
          })).intValue();
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return rc;
  }

  //========================================================================
  private static int deleteKey(Preferences root, int hkey, String key) 
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    int rc =((Integer) regDeleteKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key)
    })).intValue();
    return rc;  // can REG_NOTFOUND, REG_ACCESSDENIED, REG_SUCCESS
  }

  //========================================================================
  private static String readString(Preferences root, int hkey, String key, String value, int wow64)
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_READ | wow64)
    });
    if (handles[1] != REG_SUCCESS) {
      return null; 
    }
    byte[] valb = (byte[]) regQueryValueEx.invoke(root, new Object[] {
        new Integer(handles[0]), toCstr(value)
    });
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return (valb != null ? new String(valb).trim() : null);
  }

  //========================================================================
  private static Map<String,String> readStringValues(Preferences root, int hkey, String key, int wow64)
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    HashMap<String, String> results = new HashMap<String,String>();
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_READ | wow64)
    });
    if (handles[1] != REG_SUCCESS) {
      return null;
    }
    int[] info = (int[]) regQueryInfoKey.invoke(root, new Object[] {
        new Integer(handles[0])
    });

    int count  = info[2]; // count  
    int maxlen = info[3]; // value length max
    for(int index=0; index<count; index++)  {
      byte[] name = (byte[]) regEnumValue.invoke(root, new Object[] {
          new Integer(handles[0]), new Integer(index), new Integer(maxlen + 1)
      });
      String value = readString(hkey, key, new String(name), wow64);
      results.put(new String(name).trim(), value);
    }
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return results;
  }

  //========================================================================
  private static List<String> readStringSubKeys(Preferences root, int hkey, String key, int wow64)
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    List<String> results = new ArrayList<String>();
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_READ | wow64) 
        });
    if (handles[1] != REG_SUCCESS) {
      return null;
    }
    int[] info = (int[]) regQueryInfoKey.invoke(root, new Object[] {
        new Integer(handles[0])
    });

    int count  = info[0]; // Fix: info[2] was being used here with wrong results. Suggested by davenpcj, confirmed by Petrucio
    int maxlen = info[3]; // value length max
    for(int index=0; index<count; index++)  {
      byte[] name = (byte[]) regEnumKeyEx.invoke(root, new Object[] {
          new Integer(handles[0]), new Integer(index), new Integer(maxlen + 1)
          });
      results.add(new String(name).trim());
    }
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
    return results;
  }

  //========================================================================
  private static int [] createKey(Preferences root, int hkey, String key)
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    return (int[]) regCreateKeyEx.invoke(root, new Object[] {
      new Integer(hkey), toCstr(key)
    });
  }

  //========================================================================
  private static void writeStringValue(Preferences root, int hkey, String key, String valueName, String value, int wow64)
    throws IllegalArgumentException, IllegalAccessException, InvocationTargetException 
  {
    int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {
        new Integer(hkey), toCstr(key), new Integer(KEY_ALL_ACCESS | wow64)
    });
    regSetValueEx.invoke(root, new Object[] { 
          new Integer(handles[0]), toCstr(valueName), toCstr(value) 
          }); 
    regCloseKey.invoke(root, new Object[] { new Integer(handles[0]) });
  }

  //========================================================================
  // utility
  private static byte[] toCstr(String str) {
    byte[] result = new byte[str.length() + 1];

    for (int i = 0; i < str.length(); i++) {
      result[i] = (byte) str.charAt(i);
    }
    result[str.length()] = 0;
    return result;
  }
}

j'ai fait cela avant d'utiliser jRegistryKey . C'est une bibliothèque Java/JNI LGPL qui peut faire ce dont vous avez besoin. Voici un exemple de la façon dont je l'ai utilisé pour activer l'édition de Registre par regedit et aussi l'option "Afficher les Options de dossier" pour moi-même dans Windows via le registre.

import java.io.File;
import ca.beq.util.win32.registry.RegistryKey;
import ca.beq.util.win32.registry.RegistryValue;
import ca.beq.util.win32.registry.RootKey;
import ca.beq.util.win32.registry.ValueType;


public class FixStuff {

private static final String REGEDIT_KEY = "Software\Microsoft\Windows\CurrentVersion\Policies\System";
private static final String REGEDIT_VALUE = "DisableRegistryTools";
private static final String REGISTRY_LIBRARY_PATH = "\lib\jRegistryKey.dll";
private static final String FOLDER_OPTIONS_KEY = "Software\Microsoft\Windows\CurrentVersion\Policies\Explorer";
private static final String FOLDER_OPTIONS_VALUE = "NoFolderOptions";

public static void main(String[] args) {
    //Load JNI library
    RegistryKey.initialize( new File(".").getAbsolutePath()+REGISTRY_LIBRARY_PATH );

    enableRegistryEditing(true);        
    enableShowFolderOptions(true);
}

private static void enableShowFolderOptions(boolean enable) {
    RegistryKey key = new RegistryKey(RootKey.HKEY_CURRENT_USER,FOLDER_OPTIONS_KEY);
    RegistryKey key2 = new RegistryKey(RootKey.HKEY_LOCAL_MACHINE,FOLDER_OPTIONS_KEY);
    RegistryValue value = new RegistryValue();
    value.setName(FOLDER_OPTIONS_VALUE);
    value.setType(ValueType.REG_DWORD_LITTLE_ENDIAN);
    value.setData(enable?0:1);

    if(key.hasValue(FOLDER_OPTIONS_VALUE)) {
        key.setValue(value);
    }
    if(key2.hasValue(FOLDER_OPTIONS_VALUE)) {
        key2.setValue(value);
    }           
}

private static void enableRegistryEditing(boolean enable) {
    RegistryKey key = new RegistryKey(RootKey.HKEY_CURRENT_USER,REGEDIT_KEY);
    RegistryValue value = new RegistryValue();
    value.setName(REGEDIT_VALUE);
    value.setType(ValueType.REG_DWORD_LITTLE_ENDIAN);
    value.setData(enable?0:1);

    if(key.hasValue(REGEDIT_VALUE)) {
        key.setValue(value);
    }
}

}

Oui, en utilisant le java.util.API Préférences, depuis la mise en œuvre Windows de celui-ci utilise le Registre comme un backend.

à la fin, cela dépend de ce que vous voulez faire: stocker les préférences pour votre application est ce que les préférences font tout simplement génial. Si vous voulez réellement changer les clés de registre n'ayant pas à faire avec votre application, vous aurez besoin de certains JNI app, comme décrit par Mark (sans honte voler ici):

sur google: Vérifiez le WinPack pour JNIWrapper. Il a le plein soutien D'accès au Registre de Windows comprenant la lecture et L'écriture.

la démo WinPack a le visualiseur de Registre implémenté comme un exemple.

contrôle à http://www.teamdev.com/jniwrapper/winpack/#registry_access

et...

Il ya aussi essayer JNIRegistry @ http://www.trustice.com/java/jnireg /

il y a aussi la possibilité d'invoquer une application externe, qui est responsable de la lecture / écriture du registre.

d'un rapide google:

vérifiez le WinPack pour JNIWrapper. Il a plein accès au Registre de Windows soutien, y compris la lecture et L'écriture.

La WinPack Démo a Visionneuse Registre mis en œuvre comme un exemple.

à Vérifier http://www.teamdev.com/jniwrapper/winpack/#registry_access

et...

Il ya aussi essayer JNIRegistry @ http://www.trustice.com/java/jnireg /

il y a aussi la possibilité d'invoquer une application externe, qui est responsable de la lecture / écriture du registre.

Voici une version modifiée de la solution d'Oleg. J'ai remarqué que sur mon système (Windows server 2003), la sortie de "requête reg" n'est pas séparée par des onglets ('\t'), mais par 4 espaces.

j'ai aussi simplifié la solution, car un thread n'est pas nécessaire.

public static final String readRegistry(String location, String key)
{
  try
  {
      // Run reg query, then read output with StreamReader (internal class)
      Process process = Runtime.getRuntime().exec("reg query " + 
              '"'+ location + "\" /v " + key);

      InputStream is = process.getInputStream();
      StringBuilder sw = new StringBuilder();

      try
      {
         int c;
         while ((c = is.read()) != -1)
             sw.append((char)c);
      }
      catch (IOException e)
      { 
      }

      String output = sw.toString();

      // Output has the following format:
      // \n<Version information>\n\n<key>    <registry type>    <value>\r\n\r\n
      int i = output.indexOf("REG_SZ");
      if (i == -1)
      {
          return null;
      }

      sw = new StringBuilder();
      i += 6; // skip REG_SZ

      // skip spaces or tabs
      for (;;)
      {
         if (i > output.length())
             break;
         char c = output.charAt(i);
         if (c != ' ' && c != '\t')
             break;
         ++i;
      }

      // take everything until end of line
      for (;;)
      {
         if (i > output.length())
             break;
         char c = output.charAt(i);
         if (c == '\r' || c == '\n')
             break;
         sw.append(c);
         ++i;
      }

      return sw.toString();
  }
  catch (Exception e)
  {
      return null;
  }

}

comme il a été noté, L'API Préférences utilise le Registre pour stocker les préférences, mais ne peut pas être utilisée pour accéder à l'ensemble du registre.

cependant, un pirate appelé David Croft a travaillé sur qu'il est possible d'utiliser des méthodes dans la mise en œuvre de Sun de L'API de préférences pour la lecture du registre de Windows de Java sans JNI . Il y a certains dangers, mais il vaut le détour.

il y a peu de fournisseurs de services JNDI pour travailler avec Windows registry.

on pouvait observer http://java.sun.com/products/jndi/serviceproviders.html .

merci à l'original post. J'ai relancé cette classe utilitaire et suis venu sur les défauts qu'il avait plus tôt, pensé qu'il pourrait aider d'autres donc poster ici. J'ai aussi ajouté des méthodes d'utilité supplémentaires. Maintenant, il est capable de lire n'importe quel fichier dans le registre de windows(y compris REG_DWORD, REG_BINARY, REG_EXPAND_SZ etc.). Toutes les méthodes fonctionnent comme un charme. Il suffit de copier-coller et il devrait fonctionner. Voici la classe reskinned et modified:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;
import java.util.prefs.Preferences;

public class WinRegistry {

    private static final int REG_SUCCESS = 0;
    private static final int REG_NOTFOUND = 2;
    private static final int KEY_READ = 0x20019;
    private static final int REG_ACCESSDENIED = 5;
    private static final int KEY_ALL_ACCESS = 0xf003f;
    public static final int HKEY_CLASSES_ROOT = 0x80000000;
    public static final int HKEY_CURRENT_USER = 0x80000001;
    public static final int HKEY_LOCAL_MACHINE = 0x80000002;
    private static final String CLASSES_ROOT = "HKEY_CLASSES_ROOT";
    private static final String CURRENT_USER = "HKEY_CURRENT_USER";
    private static final String LOCAL_MACHINE = "HKEY_LOCAL_MACHINE";
    private static Preferences userRoot = Preferences.userRoot();
    private static Preferences systemRoot = Preferences.systemRoot();
    private static Class<? extends Preferences> userClass = userRoot.getClass();
    private static Method regOpenKey = null;
    private static Method regCloseKey = null;
    private static Method regQueryValueEx = null;
    private static Method regEnumValue = null;
    private static Method regQueryInfoKey = null;
    private static Method regEnumKeyEx = null;
    private static Method regCreateKeyEx = null;
    private static Method regSetValueEx = null;
    private static Method regDeleteKey = null;
    private static Method regDeleteValue = null;

    static {
        try {
            regOpenKey = userClass.getDeclaredMethod("WindowsRegOpenKey", new Class[] {int.class, byte[].class, int.class});
            regOpenKey.setAccessible(true);
            regCloseKey = userClass.getDeclaredMethod("WindowsRegCloseKey", new Class[] {int.class});
            regCloseKey.setAccessible(true);
            regQueryValueEx = userClass.getDeclaredMethod("WindowsRegQueryValueEx", new Class[] {int.class, byte[].class});
            regQueryValueEx.setAccessible(true);
            regEnumValue = userClass.getDeclaredMethod("WindowsRegEnumValue", new Class[] {int.class, int.class, int.class});
            regEnumValue.setAccessible(true);
            regQueryInfoKey = userClass.getDeclaredMethod("WindowsRegQueryInfoKey1", new Class[] {int.class});
            regQueryInfoKey.setAccessible(true);
            regEnumKeyEx = userClass.getDeclaredMethod("WindowsRegEnumKeyEx", new Class[] {int.class, int.class, int.class});  
            regEnumKeyEx.setAccessible(true);
            regCreateKeyEx = userClass.getDeclaredMethod("WindowsRegCreateKeyEx", new Class[] {int.class, byte[].class});  
            regCreateKeyEx.setAccessible(true);
            regSetValueEx = userClass.getDeclaredMethod("WindowsRegSetValueEx", new Class[] {int.class, byte[].class, byte[].class});  
            regSetValueEx.setAccessible(true);
            regDeleteValue = userClass.getDeclaredMethod("WindowsRegDeleteValue", new Class[] {int.class, byte[].class});  
            regDeleteValue.setAccessible(true);
            regDeleteKey = userClass.getDeclaredMethod("WindowsRegDeleteKey", new Class[] {int.class, byte[].class});  
            regDeleteKey.setAccessible(true);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Reads value for the key from given path
     * @param hkey   HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param path
     * @param key
     * @return the value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     * @throws IOException 
     */
    public static String valueForKey(int hkey, String path, String key) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        if (hkey == HKEY_LOCAL_MACHINE)
            return valueForKey(systemRoot, hkey, path, key);
        else if (hkey == HKEY_CURRENT_USER)
            return valueForKey(userRoot, hkey, path, key);
        else
            return valueForKey(null, hkey, path, key);
    }

    /**
     * Reads all key(s) and value(s) from given path
     * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param path
     * @return the map of key(s) and corresponding value(s)
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     * @throws IOException 
     */
    public static Map<String, String> valuesForPath(int hkey, String path) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        if (hkey == HKEY_LOCAL_MACHINE)
            return valuesForPath(systemRoot, hkey, path);
        else if (hkey == HKEY_CURRENT_USER)
            return valuesForPath(userRoot, hkey, path);
        else
            return valuesForPath(null, hkey, path);
    }

    /**
     * Read all the subkey(s) from a given path
     * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param path
     * @return the subkey(s) list
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static List<String> subKeysForPath(int hkey, String path)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        if (hkey == HKEY_LOCAL_MACHINE)
            return subKeysForPath(systemRoot, hkey, path);
        else if (hkey == HKEY_CURRENT_USER)
            return subKeysForPath(userRoot, hkey, path);
        else
            return subKeysForPath(null, hkey, path);
    }

    /**
     * Create a key
     * @param hkey  HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param key
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void createKey(int hkey, String key) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        int [] ret;
        if (hkey == HKEY_LOCAL_MACHINE) {
            ret = createKey(systemRoot, hkey, key);
            regCloseKey.invoke(systemRoot, new Object[] { new Integer(ret[0]) });
        } else if (hkey == HKEY_CURRENT_USER) {
            ret = createKey(userRoot, hkey, key);
            regCloseKey.invoke(userRoot, new Object[] { new Integer(ret[0]) });
        } else
            throw new IllegalArgumentException("hkey=" + hkey);
        if (ret[1] != REG_SUCCESS)
            throw new IllegalArgumentException("rc=" + ret[1] + "  key=" + key);
    }

    /**
     * Write a value in a given key/value name
     * @param hkey
     * @param key
     * @param valueName
     * @param value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void writeStringValue(int hkey, String key, String valueName, String value) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        if (hkey == HKEY_LOCAL_MACHINE)
            writeStringValue(systemRoot, hkey, key, valueName, value);
        else if (hkey == HKEY_CURRENT_USER)
            writeStringValue(userRoot, hkey, key, valueName, value);
        else
            throw new IllegalArgumentException("hkey=" + hkey);
    }

    /**
     * Delete a given key
     * @param hkey
     * @param key
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void deleteKey(int hkey, String key) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        int rc = -1;
        if (hkey == HKEY_LOCAL_MACHINE)
            rc = deleteKey(systemRoot, hkey, key);
        else if (hkey == HKEY_CURRENT_USER)
            rc = deleteKey(userRoot, hkey, key);
        if (rc != REG_SUCCESS)
            throw new IllegalArgumentException("rc=" + rc + "  key=" + key);
    }

    /**
     * delete a value from a given key/value name
     * @param hkey
     * @param key
     * @param value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void deleteValue(int hkey, String key, String value) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        int rc = -1;
        if (hkey == HKEY_LOCAL_MACHINE)
            rc = deleteValue(systemRoot, hkey, key, value);
        else if (hkey == HKEY_CURRENT_USER)
            rc = deleteValue(userRoot, hkey, key, value);
        if (rc != REG_SUCCESS)
            throw new IllegalArgumentException("rc=" + rc + "  key=" + key + "  value=" + value);
    }

    // =====================

    private static int deleteValue(Preferences root, int hkey, String key, String value)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {new Integer(hkey), toCstr(key), new Integer(KEY_ALL_ACCESS)});
        if (handles[1] != REG_SUCCESS)
            return handles[1];                                  // can be REG_NOTFOUND, REG_ACCESSDENIED
        int rc =((Integer) regDeleteValue.invoke(root, new Object[] {new Integer(handles[0]), toCstr(value)})).intValue();
        regCloseKey.invoke(root, new Object[] { new Integer(handles[0])});
        return rc;
    }

    private static int deleteKey(Preferences root, int hkey, String key) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        int rc =((Integer) regDeleteKey.invoke(root, new Object[] {new Integer(hkey), toCstr(key)})).intValue();
        return rc;                                                  // can REG_NOTFOUND, REG_ACCESSDENIED, REG_SUCCESS
    }

    private static String valueForKey(Preferences root, int hkey, String path, String key)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {new Integer(hkey), toCstr(path), new Integer(KEY_READ)});
        if (handles[1] != REG_SUCCESS)
            throw new IllegalArgumentException("The system can not find the specified path: '"+getParentKey(hkey)+"\"+path+"'");
        byte[] valb = (byte[]) regQueryValueEx.invoke(root, new Object[] {new Integer(handles[0]), toCstr(key)});
        regCloseKey.invoke(root, new Object[] {new Integer(handles[0])});
        return (valb != null ? parseValue(valb) : queryValueForKey(hkey, path, key));
    }

    private static String queryValueForKey(int hkey, String path, String key) throws IOException {
        return queryValuesForPath(hkey, path).get(key);
    }

    private static Map<String,String> valuesForPath(Preferences root, int hkey, String path)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        HashMap<String, String> results = new HashMap<String,String>();
        int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {new Integer(hkey), toCstr(path), new Integer(KEY_READ)});
        if (handles[1] != REG_SUCCESS)
            throw new IllegalArgumentException("The system can not find the specified path: '"+getParentKey(hkey)+"\"+path+"'");
        int[] info = (int[]) regQueryInfoKey.invoke(root, new Object[] {new Integer(handles[0])});
        int count = info[2];                            // Fixed: info[0] was being used here
        int maxlen = info[4];                           // while info[3] was being used here, causing wrong results
        for(int index=0; index<count; index++) {
            byte[] valb = (byte[]) regEnumValue.invoke(root, new Object[] {new Integer(handles[0]), new Integer(index), new Integer(maxlen + 1)});
            String vald = parseValue(valb);
            if(valb == null || vald.isEmpty())
                return queryValuesForPath(hkey, path);
            results.put(vald, valueForKey(root, hkey, path, vald));
        }
        regCloseKey.invoke(root, new Object[] {new Integer(handles[0])});
        return results;
    }

    /**
     * Searches recursively into the path to find the value for key. This method gives 
     * only first occurrence value of the key. If required to get all values in the path 
     * recursively for this key, then {@link #valuesForKeyPath(int hkey, String path, String key)} 
     * should be used.
     * @param hkey
     * @param path
     * @param key
     * @param list
     * @return the value of given key obtained recursively
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     * @throws IOException
     */
    public static String valueForKeyPath(int hkey, String path, String key)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        String val;
        try {
            val = valuesForKeyPath(hkey, path, key).get(0);
        } catch(IndexOutOfBoundsException e) {
            throw new IllegalArgumentException("The system can not find the key: '"+key+"' after "
                    + "searching the specified path: '"+getParentKey(hkey)+"\"+path+"'");
        }
        return val;
    }

    /**
     * Searches recursively into given path for particular key and stores obtained value in list
     * @param hkey
     * @param path
     * @param key
     * @param list
     * @return list containing values for given key obtained recursively
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     * @throws IOException
     */
    public static List<String> valuesForKeyPath(int hkey, String path, String key)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        List<String> list = new ArrayList<String>();
        if (hkey == HKEY_LOCAL_MACHINE)
            return valuesForKeyPath(systemRoot, hkey, path, key, list);
        else if (hkey == HKEY_CURRENT_USER)
            return valuesForKeyPath(userRoot, hkey, path, key, list);
        else
            return valuesForKeyPath(null, hkey, path, key, list);
    }

    private static List<String> valuesForKeyPath(Preferences root, int hkey, String path, String key, List<String> list)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        if(!isDirectory(root, hkey, path)) {
            takeValueInListForKey(hkey, path, key, list);
        } else {
            List<String> subKeys = subKeysForPath(root, hkey, path);
            for(String subkey: subKeys) {
                String newPath = path+"\"+subkey;
                if(isDirectory(root, hkey, newPath))
                    valuesForKeyPath(root, hkey, newPath, key, list);
                takeValueInListForKey(hkey, newPath, key, list);
            }
        }
        return list;
    }

    /**
     * Takes value for key in list
     * @param hkey
     * @param path
     * @param key
     * @param list
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     * @throws IOException
     */
    private static void takeValueInListForKey(int hkey, String path, String key, List<String> list)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IOException {
        String value = valueForKey(hkey, path, key);
        if(value != null)
            list.add(value);
    }

    /**
     * Checks if the path has more subkeys or not
     * @param root
     * @param hkey
     * @param path
     * @return true if path has subkeys otherwise false
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    private static boolean isDirectory(Preferences root, int hkey, String path)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        return !subKeysForPath(root, hkey, path).isEmpty();
    }

    private static List<String> subKeysForPath(Preferences root, int hkey, String path)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        List<String> results = new ArrayList<String>();
        int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {new Integer(hkey), toCstr(path), new Integer(KEY_READ)});
        if (handles[1] != REG_SUCCESS)
            throw new IllegalArgumentException("The system can not find the specified path: '"+getParentKey(hkey)+"\"+path+"'");
        int[] info = (int[]) regQueryInfoKey.invoke(root, new Object[] {new Integer(handles[0])});
        int count  = info[0]; // Fix: info[2] was being used here with wrong results. Suggested by davenpcj, confirmed by Petrucio
        int maxlen = info[3]; // value length max
        for(int index=0; index<count; index++) {
            byte[] valb = (byte[]) regEnumKeyEx.invoke(root, new Object[] {new Integer(handles[0]), new Integer(index), new Integer(maxlen + 1)});
            results.add(parseValue(valb));
        }
        regCloseKey.invoke(root, new Object[] {new Integer(handles[0])});
        return results;
    }

    private static int [] createKey(Preferences root, int hkey, String key)
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        return (int[]) regCreateKeyEx.invoke(root, new Object[] {new Integer(hkey), toCstr(key)});
    }

    private static void writeStringValue(Preferences root, int hkey, String key, String valueName, String value) 
            throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        int[] handles = (int[]) regOpenKey.invoke(root, new Object[] {new Integer(hkey), toCstr(key), new Integer(KEY_ALL_ACCESS)});
        regSetValueEx.invoke(root, new Object[] {new Integer(handles[0]), toCstr(valueName), toCstr(value)}); 
        regCloseKey.invoke(root, new Object[] {new Integer(handles[0])});
    }

    /**
     * Makes cmd query for the given hkey and path then executes the query
     * @param hkey
     * @param path
     * @return the map containing all results in form of key(s) and value(s) obtained by executing query
     * @throws IOException
     */
    private static Map<String, String> queryValuesForPath(int hkey, String path) throws IOException {
        String line;
        StringBuilder builder = new StringBuilder();
        Map<String, String> map = new HashMap<String, String>();
        Process process = Runtime.getRuntime().exec("reg query \""+getParentKey(hkey)+"\" + path + "\"");
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        while((line = reader.readLine()) != null) {
            if(!line.contains("REG_"))
                continue;
            StringTokenizer tokenizer = new StringTokenizer(line, " \t");
            while(tokenizer.hasMoreTokens()) {
                String token = tokenizer.nextToken();
                if(token.startsWith("REG_"))
                    builder.append("\t ");
                else
                    builder.append(token).append(" ");
            }
            String[] arr = builder.toString().split("\t");
            map.put(arr[0].trim(), arr[1].trim());
            builder.setLength(0);
        }
        return map;
    }

    /**
     * Determines the string equivalent of hkey
     * @param hkey
     * @return string equivalent of hkey
     */
    private static String getParentKey(int hkey) {
        if(hkey == HKEY_CLASSES_ROOT)
            return CLASSES_ROOT;
        else if(hkey == HKEY_CURRENT_USER)
            return CURRENT_USER;
        else if(hkey == HKEY_LOCAL_MACHINE)
            return LOCAL_MACHINE;
        return null;
    }

    /**
     *Intern method which adds the trailing "151900920" for the handle with java.dll
     * @param str String
     * @return byte[] 
     */
    private static byte[] toCstr(String str) {
        if(str == null)
            str = "";
        return (str += ""151900920"").getBytes();
    }

    /**
     * Method removes the trailing "151900920" which is returned from the java.dll (just if the last sign is a "151900920")
     * @param buf the byte[] buffer which every read method returns
     * @return String a parsed string without the trailing "151900920"
     */
    private static String parseValue(byte buf[]) {
        if(buf == null)
            return null;
        String ret = new String(buf);
        if(ret.charAt(ret.length()-1) == '"151900920"')
            return ret.substring(0, ret.length()-1);
        return ret;
    }
}  

L'échantillon de l'utilisation des méthodes est comme suit:

ci-dessous la méthode récupère la valeur de la clé du chemin donné:

String hex = WinRegistry.valueForKey(WinRegistry.HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update", "AUOptions");

cette méthode récupère toutes les données pour le chemin spécifié (sous forme de clés et de valeurs):

Map<String, String> map = WinRegistry.valuesForPath(WinRegistry.HKEY_LOCAL_MACHINE, "SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN");

cette méthode récupère la valeur récursivement pour la clé à partir du chemin donné:

String val = WinRegistry.valueForKeyPath(WinRegistry.HKEY_LOCAL_MACHINE, "System", "TypeID");

et celui-ci récupère toutes les valeurs de façon récursive pour une clé du chemin donné:

List<String> list = WinRegistry.valuesForKeyPath(
                   WinRegistry.HKEY_LOCAL_MACHINE,                  //HKEY                               "SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall",   //path                 "DisplayName"         //Key
            );

ici dans le code ci-dessus, j'ai récupéré tous les noms de logiciels installés dans le système de windows.

Note: voir la documentation de ces méthodes

et celui-ci récupère tous les sous-clés du chemin donné:

List<String> list3 = WinRegistry.subKeysForPath(WinRegistry.HKEY_CURRENT_USER, "Software");

Note importante: je n'ai modifié que les méthodes de but de lecture dans ce processus, pas les méthodes de but d'écriture comme createKey, deleteKey etc. Ils sont toujours les mêmes que je les ai reçus.

L'approche API Préférences ne vous donne pas accès à toutes les branches du registre. En fait, il ne vous donne accès qu'à l'endroit où L'API Préférences stocke ses préférences. Ce n'est pas un registre générique qui gère L'API, comme le

pour lire / écrire chaque clé je suppose que JNI ou un outil externe serait l'approche à prendre, comme le montre Mark.

la meilleure façon d'écrire au Registre est probablement d'utiliser la commande reg import native Windows et de lui donner le chemin du fichier .reg qui a été généré en exportant quelque chose du registre.

se fait avec la commande reg query . Voir aussi la documentation: https://technet.microsoft.com/en-us/library/cc742028.aspx

par conséquent, le code suivant doit être Sans objet en français:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;

public class WindowsRegistry
{
    public static void importSilently(String regFilePath) throws IOException,
            InterruptedException
    {
        if (!new File(regFilePath).exists())
        {
            throw new FileNotFoundException();
        }

        Process importer = Runtime.getRuntime().exec("reg import " + regFilePath);

        importer.waitFor();
    }

    public static void overwriteValue(String keyPath, String keyName,
            String keyValue) throws IOException, InterruptedException
    {
        Process overwriter = Runtime.getRuntime().exec(
                "reg add " + keyPath + " /t REG_SZ /v \"" + keyName + "\" /d "
                        + keyValue + " /f");

        overwriter.waitFor();
    }

    public static String getValue(String keyPath, String keyName)
            throws IOException, InterruptedException
    {
        Process keyReader = Runtime.getRuntime().exec(
                "reg query \"" + keyPath + "\" /v \"" + keyName + "\"");

        BufferedReader outputReader;
        String readLine;
        StringBuffer outputBuffer = new StringBuffer();

        outputReader = new BufferedReader(new InputStreamReader(
                keyReader.getInputStream()));

        while ((readLine = outputReader.readLine()) != null)
        {
            outputBuffer.append(readLine);
        }

        String[] outputComponents = outputBuffer.toString().split("    ");

        keyReader.waitFor();

        return outputComponents[outputComponents.length - 1];
    }
}

Vous pouvez essayer de WinRun4J . Il s'agit d'un lanceur Windows java et de l'hôte de service, mais il fournit également une bibliothèque pour accéder au registre.

(btw, je travail sur ce projet, alors laissez-moi savoir si vous avez des questions)

ma précédente édition de la réponse de @David a été rejetée. Voici quelques informations utiles à ce sujet.

cette "magie" fonctionne parce que Sun implémente la classe Preferences Pour Windows dans le cadre de JDK, mais c'est package private . Certaines parties de la mise en œuvre utilisent JNI.

• Colis privé de classe à partir du JDK java.util.prefs.WindowsPreferences : http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/java/util/prefs/WindowsPreferences.java
• JNI: http://hg.openjdk.java.net/jdk7/jdk7/jdk/file/9b8c96f96a0f/src/windows/native/java/util/WindowsPreferences.c

l'implémentation est sélectionnée à l'exécution en utilisant une méthode d'usine ici: http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/java/util/prefs/Preferences.java#Preferences.0factory

la vraie question: Pourquoi OpenJDK n'expose-t-il pas cette API au public?

le paquet java.util.prefs fournit un moyen pour les applications de stocker et de récupérer les préférences de l'utilisateur et du système et la configuration des données. Ces données de préférence seront stockées de façon continue dans un support dépendant de la mise en œuvre. Par exemple, dans le système D'exploitation Windows Dans sera stocké dans le registre Windows.

pour écrire et lire ces données, nous utilisons la classe java.util.prefs.Preferences . Le code ci-dessous montre comment lire et écrire à la HKCU et HKLM dans le registre.

import java.util.prefs.Preferences;

public class RegistryDemo {
    public static final String PREF_KEY = "org.username";
    public static void main(String[] args) {
        //
        // Write Preferences information to HKCU (HKEY_CURRENT_USER),
        // HKCU\Software\JavaSoft\Prefs\org.username
        //
        Preferences userPref = Preferences.userRoot();
        userPref.put(PREF_KEY, "xyz");

        //
        // Below we read back the value we've written in the code above.
        //
        System.out.println("Preferences = "
                + userPref.get(PREF_KEY, PREF_KEY + " was not found."));

        //
        // Write Preferences information to HKLM (HKEY_LOCAL_MACHINE),
        // HKLM\Software\JavaSoft\Prefs\org.username
        //
        Preferences systemPref = Preferences.systemRoot();
        systemPref.put(PREF_KEY, "xyz");

        //
        // Read back the value we've written in the code above.
        //
        System.out.println("Preferences = "
                + systemPref.get(PREF_KEY, PREF_KEY + " was not found."));
    }
}

encore une autre bibliothèque...

https://code.google.com/p/java-registry /

Ce on lance reg.exe sous les couvertures, la lecture/écriture aux fichiers temporaires. Je n'ai pas fini par l'utiliser, mais ça ressemble à une implémentation assez complète. Si je l'utilisais, je pourrais plonger et ajouter une meilleure gestion des processus enfant.

bien que ce soit assez vieux, mais je suppose que le meilleur utilitaire à utiliser sur la plate-forme windows serait regini :

Un seul appel à des processus:

Runtime.getRuntime().exec("regini <your script file abs path here>");

fera toute la magie. J'ai essayé, tout en faisant jar comme service windows en utilisant servany.exe qui nécessite des modifications apportées à made in registry pour ajouter javaw.exe arguments et il fonctionne parfaitement. Vous pourriez vouloir lire ceci: http://support.microsoft.com/kb/264584

C'était fou... J'ai pris le code d'un des messages ici, n'a pas vu qu'il y avait 18 commentaires supplémentaires dans lequel on a déclaré qu'il ne lit pas une valeur dword...

dans tous les cas, j'ai refactorisé ce code en quelque chose avec moins de si et de méthodes...

l'Enum pourrait être affiné un peu, mais dès que j'ai lutté pour lire une valeur numérique ou un tableau d'octets et échoué, j'ai abandonné...

alors voilà est:

package com.nu.art.software.utils;


import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.ArrayList;
import java.util.List;
import java.util.prefs.Preferences;

/**
 *
 * @author TacB0sS
 */
public class WinRegistry_TacB0sS {

    public static final class RegistryException
            extends Exception {

        private static final long serialVersionUID = -8799947496460994651L;

        public RegistryException(String message, Throwable e) {
            super(message, e);
        }

        public RegistryException(String message) {
            super(message);
        }


    }

    public static final int KEY_WOW64_32KEY = 0x0200;

    public static final int KEY_WOW64_64KEY = 0x0100;

    public static final int REG_SUCCESS = 0;

    public static final int REG_NOTFOUND = 2;

    public static final int REG_ACCESSDENIED = 5;

    private static final int KEY_ALL_ACCESS = 0xf003f;

    private static final int KEY_READ = 0x20019;

    public enum WinRegistryKey {
        User(Preferences.userRoot(), 0x80000001), ;

        // System(Preferences.systemRoot(), 0x80000002);

        private final Preferences preferencesRoot;

        private final Integer key;

        private WinRegistryKey(Preferences preferencesRoot, int key) {
            this.preferencesRoot = preferencesRoot;
            this.key = key;
        }
    }

    private enum WinRegistryMethod {
        OpenKey("WindowsRegOpenKey", int.class, byte[].class, int.class) {

            @Override
            protected void verifyReturnValue(Object retValue)
                    throws RegistryException {
                int[] retVal = (int[]) retValue;
                if (retVal[1] != REG_SUCCESS)
                    throw new RegistryException("Action Failed, Return Code: " + retVal[1]);
            }
        },
        CreateKeyEx("WindowsRegCreateKeyEx", int.class, byte[].class) {

            @Override
            protected void verifyReturnValue(Object retValue)
                    throws RegistryException {
                int[] retVal = (int[]) retValue;
                if (retVal[1] != REG_SUCCESS)
                    throw new RegistryException("Action Failed, Return Code: " + retVal[1]);
            }
        },
        DeleteKey("WindowsRegDeleteKey", int.class, byte[].class) {

            @Override
            protected void verifyReturnValue(Object retValue)
                    throws RegistryException {
                int retVal = ((Integer) retValue).intValue();
                if (retVal != REG_SUCCESS)
                    throw new RegistryException("Action Failed, Return Code: " + retVal);
            }
        },
        DeleteValue("WindowsRegDeleteValue", int.class, byte[].class) {

            @Override
            protected void verifyReturnValue(Object retValue)
                    throws RegistryException {
                int retVal = ((Integer) retValue).intValue();
                if (retVal != REG_SUCCESS)
                    throw new RegistryException("Action Failed, Return Code: " + retVal);
            }
        },
        CloseKey("WindowsRegCloseKey", int.class),
        QueryValueEx("WindowsRegQueryValueEx", int.class, byte[].class),
        EnumKeyEx("WindowsRegEnumKeyEx", int.class, int.class, int.class),
        EnumValue("WindowsRegEnumValue", int.class, int.class, int.class),
        QueryInfoKey("WindowsRegQueryInfoKey", int.class),
        SetValueEx("WindowsRegSetValueEx", int.class, byte[].class, byte[].class);

        private Method method;

        private WinRegistryMethod(String methodName, Class<?>... classes) {
            // WinRegistryKey.User.preferencesRoot.getClass().getMDeclaredMethods()
            try {
                method = WinRegistryKey.User.preferencesRoot.getClass().getDeclaredMethod(methodName, classes);
            } catch (Exception e) {
                System.err.println("Error");
                System.err.println(e);
            }
            method.setAccessible(true);
        }

        public Object invoke(Preferences root, Object... objects)
                throws RegistryException {
            Object retValue;
            try {
                retValue = method.invoke(root, objects);
                verifyReturnValue(retValue);
            } catch (Throwable e) {
                String params = "";
                if (objects.length > 0) {
                    params = objects[0].toString();
                    for (int i = 1; i < objects.length; i++) {
                        params += ", " + objects[i];
                    }
                }
                throw new RegistryException("Error invoking method: " + method + ", with params: (" + params + ")", e);
            }
            return retValue;
        }

        protected void verifyReturnValue(Object retValue)
                throws RegistryException {}
    }

    private WinRegistry_TacB0sS() {}

    public static String readString(WinRegistryKey regKey, String key, String valueName)
            throws RegistryException {
        int retVal = ((int[]) WinRegistryMethod.OpenKey.invoke(regKey.preferencesRoot, regKey.key, toCstr(key),
                new Integer(KEY_READ)))[0];

        byte[] retValue = (byte[]) WinRegistryMethod.QueryValueEx.invoke(regKey.preferencesRoot, retVal,
                toCstr(valueName));
        WinRegistryMethod.CloseKey.invoke(regKey.preferencesRoot, retVal);

        /*
         * Should this return an Empty String.
         */
        return (retValue != null ? new String(retValue).trim() : null);
    }

    public static Map<String, String> readStringValues(WinRegistryKey regKey, String key)
            throws RegistryException {
        HashMap<String, String> results = new HashMap<String, String>();
        int retVal = ((int[]) WinRegistryMethod.OpenKey.invoke(regKey.preferencesRoot, regKey.key, toCstr(key),
                new Integer(KEY_READ)))[0];

        int[] info = (int[]) WinRegistryMethod.QueryInfoKey.invoke(regKey.preferencesRoot, retVal);

        int count = info[2]; // count
        int maxlen = info[3]; // value length max
        for (int index = 0; index < count; index++) {
            byte[] name = (byte[]) WinRegistryMethod.EnumValue.invoke(regKey.preferencesRoot, retVal,
                    new Integer(index), new Integer(maxlen + 1));
            String value = readString(regKey, key, new String(name));
            results.put(new String(name).trim(), value);
        }

        WinRegistryMethod.CloseKey.invoke(regKey.preferencesRoot, retVal);
        return results;
    }

    public static List<String> readStringSubKeys(WinRegistryKey regKey, String key)
            throws RegistryException {
        List<String> results = new ArrayList<String>();
        int retVal = ((int[]) WinRegistryMethod.OpenKey.invoke(regKey.preferencesRoot, regKey.key, toCstr(key),
                new Integer(KEY_READ)))[0];

        int[] info = (int[]) WinRegistryMethod.QueryInfoKey.invoke(regKey.preferencesRoot, retVal);

        int count = info[0]; // Fix: info[2] was being used here with wrong results. Suggested by davenpcj, confirmed by
                                // Petrucio
        int maxlen = info[3]; // value length max
        for (int index = 0; index < count; index++) {
            byte[] name = (byte[]) WinRegistryMethod.EnumValue.invoke(regKey.preferencesRoot, retVal,
                    new Integer(index), new Integer(maxlen + 1));
            results.add(new String(name).trim());
        }

        WinRegistryMethod.CloseKey.invoke(regKey.preferencesRoot, retVal);
        return results;
    }

    public static void createKey(WinRegistryKey regKey, String key)
            throws RegistryException {
        int[] retVal = (int[]) WinRegistryMethod.CreateKeyEx.invoke(regKey.preferencesRoot, regKey.key, toCstr(key));
        WinRegistryMethod.CloseKey.invoke(regKey.preferencesRoot, retVal[0]);
    }

    public static void writeStringValue(WinRegistryKey regKey, String key, String valueName, String value)
            throws RegistryException {
        int retVal = ((int[]) WinRegistryMethod.OpenKey.invoke(regKey.preferencesRoot, regKey.key, toCstr(key),
                new Integer(KEY_ALL_ACCESS)))[0];

        WinRegistryMethod.SetValueEx.invoke(regKey.preferencesRoot, retVal, toCstr(valueName), toCstr(value));
        WinRegistryMethod.CloseKey.invoke(regKey.preferencesRoot, retVal);
    }

    public static void deleteKey(WinRegistryKey regKey, String key)
            throws RegistryException {
        WinRegistryMethod.DeleteKey.invoke(regKey.preferencesRoot, regKey.key, toCstr(key));
    }

    public static void deleteValue(WinRegistryKey regKey, String key, String value)
            throws RegistryException {
        int retVal = ((int[]) WinRegistryMethod.OpenKey.invoke(regKey.preferencesRoot, regKey.key, toCstr(key),
                new Integer(KEY_ALL_ACCESS)))[0];
        WinRegistryMethod.DeleteValue.invoke(regKey.preferencesRoot, retVal, toCstr(value));
        WinRegistryMethod.CloseKey.invoke(regKey.preferencesRoot, retVal);
    }

    // utility
    private static byte[] toCstr(String str) {
        byte[] result = new byte[str.length() + 1];

        for (int i = 0; i < str.length(); i++) {
            result[i] = (byte) str.charAt(i);
        }
        result[str.length()] = '"151900920"';
        return result;
    }
}

NOTE: CECI NE LIT RIEN D'AUTRE QUE DES CORDES!!!!!

La WinPack Démo a Visionneuse Registre mis en œuvre comme un exemple.

à Vérifier http://www.jniwrapper.com/winpack_features.jsp#registry

BTW, WinPack a été déplacé à l'adresse suivante:

http://www.teamdev.com/jniwrapper/winpack /

cela utilise les mêmes API internes Java que dans dans la réponse de David , mais je l'ai réécrit complètement. C'est plus courts et plus agréable à utiliser. J'ai aussi ajouté le support pour HKEY_CLASSES_ROOT et d'autres ruches. Il a cependant quelques autres limitations (comme aucune prise en charge DWORD et pas de prise en charge Unicode) qui sont dues à L'API sous-jacente et sont malheureusement inévitables avec cette approche. Cependant, si vous n'avez besoin que de la lecture/écriture de la chaîne de base et que vous ne voulez pas charger un natif DLL, c'est pratique.

je suis sûr que vous pouvez comprendre comment l'utiliser.

Domaine public. Amuser.

import java.util.*;
import java.lang.reflect.Method;

/**
 * Simple registry access class implemented using some private APIs
 * in java.util.prefs. It has no other prerequisites.
 */
public final class WindowsRegistry {
    /**
     * Tells if the Windows registry functions are available.
     * (They will not be available when not running on Windows, for example.)
     */
    public static boolean isAvailable() {
        return initError == null;
    }



    /** Reads a string value from the given key and value name. */
    public static String readValue(String keyName, String valueName) {
        try (Key key = Key.open(keyName, KEY_READ)) {
            return fromByteArray(invoke(regQueryValueEx, key.handle, toByteArray(valueName)));
        }
    }



    /** Returns a map of all the name-value pairs in the given key. */
    public static Map<String,String> readValues(String keyName) {
        try (Key key = Key.open(keyName, KEY_READ)) {
            int[] info = invoke(regQueryInfoKey, key.handle);
            checkError(info[INFO_ERROR_CODE]);
            int count = info[INFO_COUNT_VALUES];
            int maxlen = info[INFO_MAX_VALUE_LENGTH] + 1;
            Map<String,String> values = new HashMap<>();
            for (int i = 0; i < count; i++) {
                String valueName = fromByteArray(invoke(regEnumValue, key.handle, i, maxlen));
                values.put(valueName, readValue(keyName, valueName));
            }
            return values;
        }
    }



    /** Returns a list of the names of all the subkeys of a key. */
    public static List<String> readSubkeys(String keyName) {
        try (Key key = Key.open(keyName, KEY_READ)) {
            int[] info = invoke(regQueryInfoKey, key.handle);
            checkError(info[INFO_ERROR_CODE]);
            int count = info[INFO_COUNT_KEYS];
            int maxlen = info[INFO_MAX_KEY_LENGTH] + 1;
            List<String> subkeys = new ArrayList<>(count);
            for (int i = 0; i < count; i++) {
                subkeys.add(fromByteArray(invoke(regEnumKeyEx, key.handle, i, maxlen)));
            }
            return subkeys;
        }
    }



    /** Writes a string value with a given key and value name. */
    public static void writeValue(String keyName, String valueName, String value) {
        try (Key key = Key.open(keyName, KEY_WRITE)) {
            checkError(invoke(regSetValueEx, key.handle, toByteArray(valueName), toByteArray(value)));
        }
    }



    /** Deletes a value within a key. */
    public static void deleteValue(String keyName, String valueName) {
        try (Key key = Key.open(keyName, KEY_WRITE)) {
            checkError(invoke(regDeleteValue, key.handle, toByteArray(valueName)));
        }
    }



    /**
     * Deletes a key and all values within it. If the key has subkeys, an
     * "Access denied" error will be thrown. Subkeys must be deleted separately.
     */
    public static void deleteKey(String keyName) {
        checkError(invoke(regDeleteKey, keyParts(keyName)));
    }



    /**
     * Creates a key. Parent keys in the path will also be created if necessary.
     * This method returns without error if the key already exists.
     */
    public static void createKey(String keyName) {
        int[] info = invoke(regCreateKeyEx, keyParts(keyName));
        checkError(info[INFO_ERROR_CODE]);
        invoke(regCloseKey, info[INFO_HANDLE]);
    }



    /**
     * The exception type that will be thrown if a registry operation fails.
     */
    public static class RegError extends RuntimeException {
        public RegError(String message, Throwable cause) {
            super(message, cause);
        }
    }





    // *************
    // PRIVATE STUFF
    // *************

    private WindowsRegistry() {}


    // Map of registry hive names to constants from winreg.h
    private static final Map<String,Integer> hives = new HashMap<>();
    static {
        hives.put("HKEY_CLASSES_ROOT",   0x80000000); hives.put("HKCR", 0x80000000);
        hives.put("HKEY_CURRENT_USER",   0x80000001); hives.put("HKCU", 0x80000001);
        hives.put("HKEY_LOCAL_MACHINE",  0x80000002); hives.put("HKLM", 0x80000002);
        hives.put("HKEY_USERS",          0x80000003); hives.put("HKU",  0x80000003);
        hives.put("HKEY_CURRENT_CONFIG", 0x80000005); hives.put("HKCC", 0x80000005);
    }


    // Splits a path such as HKEY_LOCAL_MACHINE\Software\Microsoft into a pair of
    // values used by the underlying API: An integer hive constant and a byte array
    // of the key path within that hive.
    private static Object[] keyParts(String fullKeyName) {
        int x = fullKeyName.indexOf('\');
        String hiveName = x >= 0 ? fullKeyName.substring(0, x)  : fullKeyName;
        String keyName  = x >= 0 ? fullKeyName.substring(x + 1) : "";
        Integer hkey = hives.get(hiveName);
        if (hkey == null) throw new RegError("Unknown registry hive: " + hiveName, null);
        return new Object[] { hkey, toByteArray(keyName) };
    }


    // Type encapsulating a native handle to a registry key
    private static class Key implements AutoCloseable {
        final int handle;

        private Key(int handle) {
            this.handle = handle;
        }

        static Key open(String keyName, int accessMode) {
            Object[] keyParts = keyParts(keyName);
            int[] ret = invoke(regOpenKey, keyParts[0], keyParts[1], accessMode);
            checkError(ret[INFO_ERROR_CODE]);
            return new Key(ret[INFO_HANDLE]);
        }

        @Override
        public void close() {
            invoke(regCloseKey, handle);
        }
    }


    // Array index constants for results of regOpenKey, regCreateKeyEx, and regQueryInfoKey
    private static final int
        INFO_HANDLE = 0,
        INFO_COUNT_KEYS = 0,
        INFO_ERROR_CODE = 1,
        INFO_COUNT_VALUES = 2,
        INFO_MAX_KEY_LENGTH = 3,
        INFO_MAX_VALUE_LENGTH = 4;


    // Registry access mode constants from winnt.h
    private static final int
        KEY_READ = 0x20019,
        KEY_WRITE = 0x20006;


    // Error constants from winerror.h
    private static final int
        ERROR_SUCCESS = 0,
        ERROR_FILE_NOT_FOUND = 2,
        ERROR_ACCESS_DENIED = 5;

    private static void checkError(int e) {
        if (e == ERROR_SUCCESS) return;
        throw new RegError(
            e == ERROR_FILE_NOT_FOUND ? "Key not found" :
            e == ERROR_ACCESS_DENIED ? "Access denied" :
            ("Error number " + e), null);
    }


    // Registry access methods in java.util.prefs.WindowsPreferences
    private static final Method
        regOpenKey = getMethod("WindowsRegOpenKey", int.class, byte[].class, int.class),
        regCloseKey = getMethod("WindowsRegCloseKey", int.class),
        regQueryValueEx = getMethod("WindowsRegQueryValueEx", int.class, byte[].class),
        regQueryInfoKey = getMethod("WindowsRegQueryInfoKey", int.class),
        regEnumValue = getMethod("WindowsRegEnumValue", int.class, int.class, int.class),
        regEnumKeyEx = getMethod("WindowsRegEnumKeyEx", int.class, int.class, int.class),
        regSetValueEx = getMethod("WindowsRegSetValueEx", int.class, byte[].class, byte[].class),
        regDeleteValue = getMethod("WindowsRegDeleteValue", int.class, byte[].class),
        regDeleteKey = getMethod("WindowsRegDeleteKey", int.class, byte[].class),
        regCreateKeyEx = getMethod("WindowsRegCreateKeyEx", int.class, byte[].class);

    private static Throwable initError;

    private static Method getMethod(String methodName, Class<?>... parameterTypes) {
        try {
            Method m = java.util.prefs.Preferences.systemRoot().getClass()
                .getDeclaredMethod(methodName, parameterTypes);
            m.setAccessible(true);
            return m;
        } catch (Throwable t) {
            initError = t;
            return null;
        }
    }

    @SuppressWarnings("unchecked")
    private static <T> T invoke(Method method, Object... args) {
        if (initError != null)
            throw new RegError("Registry methods are not available", initError);
        try {
            return (T)method.invoke(null, args);
        } catch (Exception e) {
            throw new RegError(null, e);
        }
    }


    // Conversion of strings to/from null-terminated byte arrays.
    // There is no support for Unicode; sorry, this is a limitation
    // of the underlying methods that Java makes available.
    private static byte[] toByteArray(String str) {
        byte[] bytes = new byte[str.length() + 1];
        for (int i = 0; i < str.length(); i++)
            bytes[i] = (byte)str.charAt(i);
        return bytes;
    }

    private static String fromByteArray(byte[] bytes) {
        if (bytes == null) return null;
        char[] chars = new char[bytes.length - 1];
        for (int i = 0; i < chars.length; i++)
            chars[i] = (char)((int)bytes[i] & 0xFF);
        return new String(chars);
    }
}

un jour, Java aura intégré foreign function interface pour un accès facile aux API natives, et ce genre de piratage sera inutile.

en réponse à David réponse - je ferais quelques améliorations:

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.prefs.Preferences;

public class WinRegistry {

    public static final int HKEY_CURRENT_USER = 0x80000001,
            HKEY_LOCAL_MACHINE = 0x80000002,
            REG_SUCCESS = 0,
            REG_NOTFOUND = 2,
            REG_ACCESSDENIED = 5,
            KEY_ALL_ACCESS = 0xf003f,
            KEY_READ = 0x20019;
    private static final Preferences userRoot = Preferences.userRoot(),
            systemRoot = Preferences.systemRoot();
    private static final Class<? extends Preferences> userClass = userRoot.getClass();
    private static Method regOpenKey,
            regCloseKey,
            regQueryValueEx,
            regEnumValue,
            regQueryInfoKey,
            regEnumKeyEx,
            regCreateKeyEx,
            regSetValueEx,
            regDeleteKey,
            regDeleteValue;

    static {
        try {
            (regOpenKey = userClass.getDeclaredMethod("WindowsRegOpenKey", new Class[]{int.class, byte[].class, int.class})).setAccessible(true);
            (regCloseKey = userClass.getDeclaredMethod("WindowsRegCloseKey", new Class[]{int.class})).setAccessible(true);
            (regQueryValueEx = userClass.getDeclaredMethod("WindowsRegQueryValueEx", new Class[]{int.class, byte[].class})).setAccessible(true);
            (regEnumValue = userClass.getDeclaredMethod("WindowsRegEnumValue", new Class[]{int.class, int.class, int.class})).setAccessible(true);
            (regQueryInfoKey = userClass.getDeclaredMethod("WindowsRegQueryInfoKey1", new Class[]{int.class})).setAccessible(true);
            (regEnumKeyEx = userClass.getDeclaredMethod("WindowsRegEnumKeyEx", new Class[]{int.class, int.class, int.class})).setAccessible(true);
            (regCreateKeyEx = userClass.getDeclaredMethod("WindowsRegCreateKeyEx", new Class[]{int.class, byte[].class})).setAccessible(true);
            (regSetValueEx = userClass.getDeclaredMethod("WindowsRegSetValueEx", new Class[]{int.class, byte[].class, byte[].class})).setAccessible(true);
            (regDeleteValue = userClass.getDeclaredMethod("WindowsRegDeleteValue", new Class[]{int.class, byte[].class})).setAccessible(true);
            (regDeleteKey = userClass.getDeclaredMethod("WindowsRegDeleteKey", new Class[]{int.class, byte[].class})).setAccessible(true);
        } catch (NoSuchMethodException | SecurityException ex) {
            Logger.getLogger(WinRegistry.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Read a value from key and value name
     *
     * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param key
     * @param valueName
     * @return the value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static String readString(int hkey, String key, String valueName) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        switch (hkey) {
            case HKEY_LOCAL_MACHINE:
                return readString(systemRoot, hkey, key, valueName);
            case HKEY_CURRENT_USER:
                return readString(userRoot, hkey, key, valueName);
            default:
                throw new IllegalArgumentException("hkey=" + hkey);
        }
    }

    /**
     * Read value(s) and value name(s) form given key
     *
     * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param key
     * @return the value name(s) plus the value(s)
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static Map<String, String> readStringValues(int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        switch (hkey) {
            case HKEY_LOCAL_MACHINE:
                return readStringValues(systemRoot, hkey, key);
            case HKEY_CURRENT_USER:
                return readStringValues(userRoot, hkey, key);
            default:
                throw new IllegalArgumentException("hkey=" + hkey);
        }
    }

    /**
     * Read the value name(s) from a given key
     *
     * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param key
     * @return the value name(s)
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static List<String> readStringSubKeys(int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        switch (hkey) {
            case HKEY_LOCAL_MACHINE:
                return readStringSubKeys(systemRoot, hkey, key);
            case HKEY_CURRENT_USER:
                return readStringSubKeys(userRoot, hkey, key);
            default:
                throw new IllegalArgumentException("hkey=" + hkey);
        }
    }

    /**
     * Create a key
     *
     * @param hkey HKEY_CURRENT_USER/HKEY_LOCAL_MACHINE
     * @param key
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void createKey(int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        int[] ret;
        switch (hkey) {
            case HKEY_LOCAL_MACHINE:
                ret = createKey(systemRoot, hkey, key);
                regCloseKey.invoke(systemRoot, new Object[]{ret[0]});
                break;
            case HKEY_CURRENT_USER:
                ret = createKey(userRoot, hkey, key);
                regCloseKey.invoke(userRoot, new Object[]{ret[0]});
                break;
            default:
                throw new IllegalArgumentException("hkey=" + hkey);
        }

        if (ret[1] != REG_SUCCESS) {
            throw new IllegalArgumentException("rc=" + ret[1] + " key=" + key);
        }
    }

    /**
     * Write a value in a given key/value name
     *
     * @param hkey
     * @param key
     * @param valueName
     * @param value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void writeStringValue(int hkey, String key, String valueName, String value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        switch (hkey) {
            case HKEY_LOCAL_MACHINE:
                writeStringValue(systemRoot, hkey, key, valueName, value);
                break;
            case HKEY_CURRENT_USER:
                writeStringValue(userRoot, hkey, key, valueName, value);
                break;
            default:
                throw new IllegalArgumentException("hkey=" + hkey);
        }
    }

    /**
     * Delete a given key
     *
     * @param hkey
     * @param key
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void deleteKey(int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        int rc = -1;
        switch (hkey) {
            case HKEY_LOCAL_MACHINE:
                rc = deleteKey(systemRoot, hkey, key);
                break;
            case HKEY_CURRENT_USER:
                rc = deleteKey(userRoot, hkey, key);
        }

        if (rc != REG_SUCCESS) {
            throw new IllegalArgumentException("rc=" + rc + " key=" + key);
        }
    }

    /**
     * delete a value from a given key/value name
     *
     * @param hkey
     * @param key
     * @param value
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws InvocationTargetException
     */
    public static void deleteValue(int hkey, String key, String value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        int rc = -1;
        switch (hkey) {
            case HKEY_LOCAL_MACHINE:
                rc = deleteValue(systemRoot, hkey, key, value);
                break;
            case HKEY_CURRENT_USER:
                rc = deleteValue(userRoot, hkey, key, value);
        }

        if (rc != REG_SUCCESS) {
            throw new IllegalArgumentException("rc=" + rc + " key=" + key + " value=" + value);
        }
    }

    private static int deleteValue(Preferences root, int hkey, String key, String value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        int[] handles = (int[]) regOpenKey.invoke(root, new Object[]{hkey, toCstr(key), KEY_ALL_ACCESS});
        if (handles[1] != REG_SUCCESS) {
            return handles[1];//Can be REG_NOTFOUND, REG_ACCESSDENIED
        }
        int rc = ((Integer) regDeleteValue.invoke(root, new Object[]{handles[0], toCstr(value)}));
        regCloseKey.invoke(root, new Object[]{handles[0]});
        return rc;
    }

    private static int deleteKey(Preferences root, int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        int rc = ((Integer) regDeleteKey.invoke(root, new Object[]{hkey, toCstr(key)}));
        return rc;  //Can be REG_NOTFOUND, REG_ACCESSDENIED, REG_SUCCESS
    }

    private static String readString(Preferences root, int hkey, String key, String value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        int[] handles = (int[]) regOpenKey.invoke(root, new Object[]{hkey, toCstr(key), KEY_READ});
        if (handles[1] != REG_SUCCESS) {
            return null;
        }
        byte[] valb = (byte[]) regQueryValueEx.invoke(root, new Object[]{handles[0], toCstr(value)});
        regCloseKey.invoke(root, new Object[]{handles[0]});
        return (valb != null ? new String(valb).trim() : null);
    }

    private static Map<String, String> readStringValues(Preferences root, int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        HashMap<String, String> results = new HashMap<>();
        int[] handles = (int[]) regOpenKey.invoke(root, new Object[]{hkey, toCstr(key), KEY_READ});
        if (handles[1] != REG_SUCCESS) {
            return null;
        }
        int[] info = (int[]) regQueryInfoKey.invoke(root, new Object[]{handles[0]});

        int count = info[0]; //Count  
        int maxlen = info[3]; //Max value length
        for (int index = 0; index < count; index++) {
            byte[] name = (byte[]) regEnumValue.invoke(root, new Object[]{handles[0], index, maxlen + 1});
            String value = readString(hkey, key, new String(name));
            results.put(new String(name).trim(), value);
        }
        regCloseKey.invoke(root, new Object[]{handles[0]});
        return results;
    }

    private static List<String> readStringSubKeys(Preferences root, int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        List<String> results = new ArrayList<>();
        int[] handles = (int[]) regOpenKey.invoke(root, new Object[]{hkey, toCstr(key), KEY_READ});
        if (handles[1] != REG_SUCCESS) {
            return null;
        }
        int[] info = (int[]) regQueryInfoKey.invoke(root, new Object[]{handles[0]});

        int count = info[0];//Count
        int maxlen = info[3]; //Max value length
        for (int index = 0; index < count; index++) {
            byte[] name = (byte[]) regEnumKeyEx.invoke(root, new Object[]{handles[0], index, maxlen + 1});
            results.add(new String(name).trim());
        }
        regCloseKey.invoke(root, new Object[]{handles[0]});
        return results;
    }

    private static int[] createKey(Preferences root, int hkey, String key) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        return (int[]) regCreateKeyEx.invoke(root, new Object[]{hkey, toCstr(key)});
    }

    private static void writeStringValue(Preferences root, int hkey, String key, String valueName, String value) throws IllegalArgumentException, IllegalAccessException, InvocationTargetException {

        int[] handles = (int[]) regOpenKey.invoke(root, new Object[]{hkey, toCstr(key), KEY_ALL_ACCESS});
        regSetValueEx.invoke(root, new Object[]{handles[0], toCstr(valueName), toCstr(value)});
        regCloseKey.invoke(root, new Object[]{handles[0]});
    }

    private static byte[] toCstr(String str) {

        byte[] result = new byte[str.length() + 1];
        for (int i = 0; i < str.length(); i++) {
            result[i] = (byte) str.charAt(i);
        }
        result[str.length()] = 0;
        return result;
    }
}

vous pouvez exécuter la commande" requête REG "en utilisant le code java .

essayez de l'exécuter à partir de l'invite de commande et exécutez la commande à partir du code java.

HKEY_LOCAL_MACHINE "SOFTWARE\Microsoft\Windows NT\CurrentVersion"

pour rechercher des détails comme la version du nom de produit, etc.. utilisation /v amd "nom".

HKEY_LOCAL_MACHINE "SOFTWARE\Microsoft\Windows NT\CurrentVersion" / v "ProductName"

je préfère utiliser java.util.préf.Préférences classe.

un exemple simple serait

// Write Operation
Preferences p = Preferences.userRoot();
p.put("key","value"); 
// also there are various other methods such as putByteArray(), putDouble() etc.
p.flush();
//Read Operation
Preferences p = Preferences.userRoot();
String value = p.get("key");