자바에서 윈도우 레지스트리 읽고 쓰기

함수 호출 코드

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


List<String> list = WinRegistry.readStringSubKeys(
	WinRegistry.HKEY_LOCAL_MACHINE              //HKEY
    , "SYSTEM\\ControlSet001\\Enum\\ACPI\\");   //Key

 

 

레지스트리 호출 코드

package net.samsungds.swservice.Handler.Util;

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<>();
        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<>();
        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;
    }
}

 

출처 : https://stackoverflow.com/questions/62289/read-write-to-windows-registry-using-java