如何使用Java读取/写入Windows注册表？

解决方案

回答

是的，使用java.util.Preferences API，因为它的Windows实现使用注册表作为后端。

最后，这取决于我们要执行的操作：存储应用程序的首选项才是Preferences最好的选择。如果我们实际上想更改与应用程序无关的注册表项，则需要一些JNI应用程序，如Mark所描述的(这里是无耻的窃取)：

From a quick google:
  Check the WinPack for JNIWrapper. It has full Windows Registry access support including Reading and Writing.
  
  The WinPack Demo has Registry Viewer implemented as an example.
  
  Check at http://www.teamdev.com/jniwrapper/winpack/#registry_access
  
  And...
  
  There is also try JNIRegistry @ http://www.trustice.com/java/jnireg/
  
  There is also the option of invoking an external app, which is responsible for reading / writing the registry.

回答

从快速的Google：

Check the WinPack for JNIWrapper. It
  has full Windows Registry access
  support including Reading and Writing.
  
  The WinPack Demo has Registry Viewer
  implemented as an example.
  
  Check at
  http://www.teamdev.com/jniwrapper/winpack/#registry_access

和...

There is also try JNIRegistry @
  http://www.trustice.com/java/jnireg/

还可以选择调用外部应用程序，该应用程序负责读取/写入注册表。

回答

首选项API方法不能让我们访问注册表的所有分支。实际上，它仅使我们可以访问Preferences API存储其首选项的位置。它不是通用的注册表处理API，例如.NET的

正如Mark所示，我想采用JNI或者外部工具来读取/写入每个密钥。

回答

很少有JNDI服务提供商可以使用Windows注册表。

可以观察http://java.sun.com/products/jndi/serviceproviders.html。

回答

在使用jRegistryKey之前，我已经完成了此操作。这是一个LGPL Java / JNI库，可以满足需求。这是一个示例，说明了如何使用它通过regedit启用注册表编辑以及通过注册表在Windows中为自己启用"显示文件夹选项"选项。

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);
    }
}

}

回答

The WinPack Demo has Registry Viewer
  implemented as an example.
  
  Check at
  http://www.jniwrapper.com/winpack_features.jsp#registry

顺便说一句，WinPack已移至以下地址：

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

回答

我们可以尝试WinRun4J。这是Windows Java启动器和服务主机，但它也提供用于访问注册表的库。

(顺便说一下，我正在从事这个项目，所以如果我们有任何疑问，请告诉我)

回答

我们实际上不需要第三者套餐。 Windows具有用于所有注册表操作的reg实用程序。要获取命令格式，请转到DOS属性并键入：

reg /?

我们可以通过Runtime类调用reg：

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

使用上面的命令，编辑密钥和添加新密钥非常简单。要读取注册表，我们需要获取reg的输出，这有些棘手。这是代码：

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);
    }
}