java读写注册表

用java的Preferences有很大限制，最好是下载jRegistryKey,解压出jRegistryKey.jar和jRegistryKey.dll引入项目中

import java.util.Iterator;

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 CaRegTest1 {

    public static void main(String[] args) {

        //列出HKEY_CURRENT_USER的子键
        RegistryKey current_user = new RegistryKey(RootKey.HKEY_CURRENT_USER);
        if (current_user.hasSubkeys()){
            Iterator<RegistryKey> keys = current_user.subkeys();
            while (keys.hasNext()) {
                RegistryKey k = keys.next();
                System.out.println(k.getName());
            }
        }

        //列出 HKEY_CURRENT_USER/Environment 的所有键值的名称、类型和数据
        RegistryKey env = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Environment" );
        if (env.hasValues()) {
            Iterator<RegistryValue> values = env.values();
            while (values.hasNext()) {
                RegistryValue v = values.next();
                System.out.println(v.getName()+ "\t" +v.getType());
                System.out.println( "\t" +v.getData());
            }
        }

        //写入注册表
        RegistryKey newKey = new RegistryKey(RootKey.HKEY_CURRENT_USER, "Environment\\NewKey" );
        newKey.create(); //创建新的键HKEY_CURRENT_USER/Environment/NewKey
        RegistryValue value = new RegistryValue( "My Paht" ,ValueType.REG_SZ, "hahah\\lalal" );
        newKey.setValue(value); //在新创建的键里写入键值,在注册表中按F5刷新一下能看到变化了吧
    }

}