回答:
私はこの質問が古いことを知っていますが、それはグーグルで「レジストリにJava読み取り/書き込み」する最初の検索結果です。最近私はこの驚くべきコードを見つけました：
これは純粋なJavaコードです。
実際にjava.util.prefs.Preferencesクラスのプライベートメソッドにアクセスすることにより、リフレクションを使用して機能します。このクラスの内部は複雑ですが、クラス自体は非常に使いやすいです。
たとえば、次のコードは、レジストリから正確なWindowsディストリビューションを取得します。
String value = WinRegistry.readString (
WinRegistry.HKEY_LOCAL_MACHINE, //HKEY
"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", //Key
"ProductName"); //ValueName
System.out.println("Windows Distribution = " + value); これが元のクラスです。コピーして貼り付けるだけで動作します。
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;
}
}原作者：Apache。
ライブラリソース：https : //github.com/apache/npanday/tree/trunk/components/dotnet-registry/src/main/java/npanday/registry
Java 9：それは次の警告を生成するのでAn illegal reflective access operation has occurred
実際にはサードパーティのパッケージは必要ありません。Windowsには、すべてのレジストリ操作用のregユーティリティがあります。コマンド形式を取得するには、DOSプロンプトに移動して次のように入力します。
reg /?Runtimeクラスを介してregを呼び出すことができます。
Runtime.getRuntime().exec("reg <your parameters here>");上記のコマンドを使用すると、キーの編集と新しいキーの追加は簡単です。レジストリを読み取るには、regの出力を取得する必要がありますが、少し注意が必要です。これがコードです：
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）は、ネイティブライブラリを操作するための優れたプロジェクトであり、Advapi32UtilおよびAdvapi32を介してプラットフォームライブラリ（platform.jar）のWindowsレジストリをサポートしています。
更新：これは、JNAを使用してJNA 3.4.1を使用するWindowsレジストリを操作するのがいかに簡単かを示すいくつかの例を含むスニペットです
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");
}
}Davidが最初に投稿したPure Javaコードをインクリメントして、64ビットのJVMからレジストリの32ビットのセクションにアクセスできるようにしました。逆も同様です。他の回答はこれに対処しないと思います。
ここにあります：
/**
* 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;
}
}intにlong再びこの作品を作るために。
jRegistryKeyを使用する前にこれを行いました。これは、必要なことを実行できるLGPL Java / JNIライブラリです。これは、regeditを使用してレジストリ編集を有効にする方法と、Windowsでレジストリを使用して[フォルダオプションを表示]オプションを有効にする方法の例です。
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);
}
}
}はい、java.util.Preferences APIを使用しています。これは、Windowsの実装がレジストリをバックエンドとして使用しているためです。
結局、それはあなたが何をしたいかによります：あなたのアプリの設定を保存することは設定がちょうど素晴らしいことです。アプリに関係のないレジストリキーを実際に変更したい場合は、Markが説明しているように、JNIアプリが必要です（ここでは恥知らずな盗み）。
簡単なグーグルから：WinPack for JNIWrapperを確認してください。読み取りと書き込みを含む完全なWindowsレジストリアクセスサポートがあります。
WinPackデモには、例としてRegistry Viewerが実装されています。
http://www.teamdev.com/jniwrapper/winpack/#registry_accessで確認してください
そして...
JNIRegistry @ http://www.trustice.com/java/jnireg/も試してください
レジストリの読み取り/書き込みを行う外部アプリを呼び出すオプションもあります。
簡単なグーグルから：
WinPackでJNIWrapperを確認します。読み取りと書き込みを含む完全なWindowsレジストリアクセスサポートがあります。
WinPackデモには、例としてRegistry Viewerが実装されています。
http://www.teamdev.com/jniwrapper/winpack/#registry_accessで確認して ください
そして...
JNIRegistry @ http://www.trustice.com/java/jnireg/も試して ください
レジストリの読み取り/書き込みを行う外部アプリを呼び出すオプションもあります。
以下は、Olegのソリューションの修正バージョンです。私のシステム（Windows server 2003）では、「reg query」の出力がタブ（ '\ t'）ではなく4つのスペースで区切られていることに気付きました。
スレッドが必要ないため、ソリューションも簡略化しました。
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;
}}
元の投稿に感謝します。私はこのユーティリティクラスを作り直し、それが以前に持っていた欠陥を見つけました、他の人を助けるかもしれないと思ったので、ここに投稿してください。また、追加のユーティリティメソッドをいくつか追加しました。これで、Windowsレジストリ（REG_DWORD、REG_BINARY、REG_EXPAND_SZなどを含む）内の任意のファイルを読み取ることができます。すべての方法が魅力のように機能します。コピーして貼り付けるだけで動作します。以下は、スキンを変更して変更したクラスです。
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 \0 for the handle with java.dll
* @param str String
* @return byte[]
*/
private static byte[] toCstr(String str) {
if(str == null)
str = "";
return (str += "\0").getBytes();
}
/**
* Method removes the trailing \0 which is returned from the java.dll (just if the last sign is a \0)
* @param buf the byte[] buffer which every read method returns
* @return String a parsed string without the trailing \0
*/
private static String parseValue(byte buf[]) {
if(buf == null)
return null;
String ret = new String(buf);
if(ret.charAt(ret.length()-1) == '\0')
return ret.substring(0, ret.length()-1);
return ret;
}
} メソッドの使用例は次のとおりです。
以下のメソッドは、指定されたパスからキーの値を取得します。
String hex = WinRegistry.valueForKey(WinRegistry.HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\WindowsUpdate\\Auto Update", "AUOptions");このメソッドは、指定されたパスのすべてのデータを（キーと値の形式で）取得します。
Map<String, String> map = WinRegistry.valuesForPath(WinRegistry.HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\WSMAN");このメソッドは、指定されたパスからキーの値を再帰的に取得します。
String val = WinRegistry.valueForKeyPath(WinRegistry.HKEY_LOCAL_MACHINE, "System", "TypeID");これは、指定されたパスからキーのすべての値を再帰的に取得します。
List<String> list = WinRegistry.valuesForKeyPath(
WinRegistry.HKEY_LOCAL_MACHINE, //HKEY "SOFTWARE\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall", //path "DisplayName" //Key
);上記のコードで、Windowsシステムにインストールされているすべてのソフトウェア名を取得しました。
注：これらのメソッドのドキュメントを参照してください
そして、これは与えられたパスのすべてのサブキーを取得します：
List<String> list3 = WinRegistry.subKeysForPath(WinRegistry.HKEY_CURRENT_USER, "Software");重要な注意：このプロセスでは、読み取り専用のメソッドのみを変更しました。createKey、deleteKeyなどの書き込み専用のメソッドは変更していません。これらは、受け取ったものと同じです。
レジスタに書き込む最善の方法は、おそらくreg importネイティブのWindowsコマンドを使用して.reg、レジストリから何かをエクスポートすることによって生成されたファイルへのファイルパスを与えることです。
読み取りはreg queryコマンドで行われます。ドキュメントも参照してください：https :
//technet.microsoft.com/en-us/library/cc742028.aspx
したがって、次のコードは自明です。
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];
}
}前述のように、Preferences APIはレジストリを使用して設定を保存しますが、レジストリ全体にアクセスするために使用することはできません。
ただし、David Croftと呼ばれる海賊が、SunのPreferences APIの実装でメソッドを使用して、JNIなしでJavaからWindowsレジストリを読み取ることができることを発見しました。これにはいくつかの危険がありますが、一見の価値があります。
Windowsレジストリを操作するJNDIサービスプロバイダーはほとんどありません。
http://java.sun.com/products/jndi/serviceproviders.htmlを観察できます。
Preferences APIのアプローチでは、レジストリのすべてのブランチにアクセスできるわけではありません。実際、Preferences APIがその設定を保存する場所へのアクセスのみを提供します。.NETのような一般的なレジストリ処理APIではありません。
マークが示すように、すべてのキーを読み書きするには、JNIまたは外部ツールを使用するアプローチが考えられます。
@Davidの回答に対する以前の編集は拒否されました。これに関するいくつかの有用な情報があります。
この「魔法」は、Sun PreferencesがJDKの一部としてWindows用のクラスを実装しているため機能しますが、パッケージプライベートです。実装の一部はJNIを使用します。
java.util.prefs.WindowsPreferences：http : //grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/java/util/prefs/WindowsPreferences.java実装は、ここでファクトリメソッドを使用して実行時に選択されます。http：//grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/java/util/prefs/Preferences.java# Preferences.0factory
本当の質問：OpenJDKはなぜこのAPIを公開しないのですか？
このjava.util.prefsパッケージは、アプリケーションがユーザーとシステムの設定およびデータ構成を格納および取得する方法を提供します。これらの設定データは、実装に依存するバッキングに永続的に格納されます。たとえば、Windowsオペレーティングシステムでは、Windowsレジストリに保存されます。
これらのデータを読み書きするには、java.util.prefs.Preferencesクラスを使用します。コードショー未満に読み書きする方法HKCUとHKLM、レジストリに。
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."));
}
}さらに別のライブラリ...
https://code.google.com/p/java-registry/
これはreg.exeを内部で起動し、一時ファイルの読み取り/書き込みを行います。最終的には使用しませんでしたが、かなり包括的な実装のように見えます。私がそれを使用した場合、私は飛び込んで、子プロセスのいくつかのより良い管理を追加するかもしれません。
これはかなり古いですが、Windowsプラットフォームで使用するより良いユーティリティは次のようになると思いますregini：
処理する単一の呼び出し：
Runtime.getRuntime().exec("regini <your script file abs path here>");すべての魔法を行います。私はそれを試しましたが、servany.exeを使用してjarをWindowsサービスとして作成しましたが、javaw.exe引数を追加するためにレジストリを変更する必要があり、完全に機能します。これを読むことをお勧めします：http : //support.microsoft.com/kb/264584
これはクレイジーでした...私はここの投稿の1つからコードを取得しましたが、dword値を読み取らないと述べたコメントが18件以上あることを確認できませんでした...
とにかく、私はそのコードの地獄をifsとメソッドの少ないものにリファクタリングしました...
Enumは少し洗練される可能性がありますが、数値またはバイト配列を読み取るための方法を試して失敗するとすぐに、私はあきらめました...
だからここにあります：
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()] = '\0';
return result;
}
}注：これは他の文字列を読み取るものではありません!!!!!
WinPackデモには、例としてRegistry Viewerが実装されています。
http://www.jniwrapper.com/winpack_features.jsp#registryで確認して ください
ところで、WinPackは次のアドレスに移動されました。
これは、Davidの回答と同じJava内部APIを使用していますが、完全に書き直しました。現在は短く、使いやすくなっています。HKEY_CLASSES_ROOTおよびその他のハイブのサポートも追加しました。ただし、基盤となるAPIが原因であり、残念ながらこのアプローチでは避けられない他の制限（DWORDサポートやUnicodeサポートがないなど）もいくつかあります。それでも、基本的な文字列の読み取り/書き込みだけが必要で、ネイティブDLLをロードしたくない場合は、便利です。
きっと使い方がわかると思います。
パブリックドメイン。楽しんで。
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);
}
}ある日、JavaにはネイティブAPIに簡単にアクセスできる組み込みの外部関数インターフェースがあり、この種のハックは不要になります。
デビッドの答えに応えて-私はいくつかの拡張を行います：
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;
}
}これらの「REG QUERY」コマンドは、Javaコードを使用して実行できます。
コマンドプロンプトからこれを実行し、Javaコードからコマンドを実行してみてください。
HKEY_LOCAL_MACHINE "SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion"
製品名バージョンなどの詳細を検索するには、/ v amd "name"を使用します。
HKEY_LOCAL_MACHINE "SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion" / v "ProductName"
私はjava.util.prefs.Preferencesクラスを使用することを好みます。
簡単な例は
// 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");
com.sun.deploy.association.utility.WinRegistryWrapper