如何通过java访问Windows注册表？ [英] How can I access windows registry by java?

问题描述

我想在特殊键中创建并写入一个值。

提前谢谢。



我是什么尝试过：



我测试'WinRegistry Class'但是我无法在key中创建和写入值也尝试了一些我发现它们的其他类在网上搜索。遗憾的是，它们都没有解决我的问题。

I want to create and write a value in a special key.
Thank you in advance.

What I have tried:

I test 'WinRegistry Class' but I could not create and write a value in key also try some other class which I found them by searching on the net. unfortunately, none of them solve my problem.

推荐答案

如果你想用Java访问windows注册表，你可以使用Java Runtime class

If you want to access the windows registry with Java you can use the Java Runtime class

Runtime.getRuntime().exec("REG ADD HKCU\\SOFTWARE\\TEST")

这是我编写的一个小示例应用程序，用于显示Windows命令行注册表工具与Java Runtime类结合使用的一些可能性。 />


此代码使用m

Here is a little sample application i've wrote to show some possibilities of the windows commandline registry tool in combination with the Java Runtime class.

This code uses the m

reg.exe工具。



如果要创建，修改或删除HKEY_LOCAL_MACHINE或HKEY_CURRENT_CONFIG等特殊注册表项，您可能需要提升系统权限。

reg.exe tool.

If you want to create, modify or delete special registry keys like HKEY_LOCAL_MACHINE or HKEY_CURRENT_CONFIG you may need elevated privileges on your system.

import java.io.IOException;
import java.util.Scanner;


/**
 * Sample Java Application to access to windows registry through 
 * the windows commandline application reg.exe
 * 
 * Just a sample application: 
 * 
 * Open your command prompt and enter REG /? to add missing features
 * 
 * 
 */
public class WinReg {
	
	/**
	 * Success status code
	 */
	public static final int REG_SUCCESS = 0;
	
	/**
	 * Failure status code
	 */
	public static final int REG_FAILURE = 1;

	
	
	/**
	 * Implemented root-keys<br>
	 * HKLM HKEY_LOCAL_MACHINE elevated privileges needed<br>
	 * HKCU HKEY_CURRENT_USER <br>
	 * HKCR HKEY_CLASSES_ROOT elevated privileges needed<br>
	 * HKU HKEY_USER  <br>
	 * HKCC HKEY_CURRENT_CONFIG elevated privileges needed<br>
	 *
	 */
	private enum WRKey {
		HKLM,  HKCU , HKCR , HKU , HKCC
	}
	
	
	/**
	 * Registry data-types
	 */
	private enum WRType {
        REG_SZ, REG_MULTI_SZ, REG_EXPAND_SZ,
        REG_DWORD, REG_QWORD, REG_BINARY, REG_NONE
	}
	
	/**
	 * Creates a new string for the registry cli.
	 * 
	 * @param hkey the  root key [ HKLM , HKCU ] 
	 * @param key the name of the key  SOFTWARE\WINDOWS
	 * @param valueName the name of the value
	 * @param data 
	 * @param type 
	 * @param force override an existing key ?
	 * 
	 * @see WRKey
	 * @see WRType
	 * @return the string value to the registry cli
	 */
	
	public String createRegString(WRKey hkey, String key, String valueName, byte[] data,  WRType type, boolean force) {
		String keyString = " "+hkey+"\\" + key; 
		String valueString = valueName!=null 	? " /v "+ valueName : "" ;
		String dataString =  data != null 		? (" " + ( data.length>0 ? " /d " + new String(data) : "")):"";
		String typeString = type != null 		? " /t " + type : "";
		
		return keyString + valueString + dataString + typeString +  (force ? " /f" : "");
	}
	
	/**
	 * Adds a new key to the windows registry
	 * 
	 * @param hkey The root-key [ HKLM , HKCU ] 
	 * @param key the key name to create eg. SOFTWARE\TEST\ABCD
	 * @return true on success
	 * @throws IOException
	 * @throws InterruptedException
	 * 
	 * @see WRKEY
	 * 	
	 */
	public boolean addKey(WRKey hkey, String key) throws IOException, InterruptedException{
		Process proc = Runtime.getRuntime().exec("REG ADD "+hkey+"\\" + key + " /f");
		proc.waitFor();
		
		return proc.exitValue() == REG_SUCCESS;
	}
	
	/**
	 * Adds a value to an existing registry key
	 * @param hkey The root-key [ HKLM , HKCU ] 
	 * @param key the key name to create eg. SOFTWARE\TEST\ABCD
	 * @param valueName the name of the value to add the data
	 * @param data the data as a byte array
	 * @param type the type of data [ REG_STRING ,REG_DWORD ]
	 * @return true on success
	 * @throws IOException
	 * @throws InterruptedException
	 * 
	 * @see WRKey
	 * @see WRType
	 */

	public boolean addValue(WRKey hkey, String key, String valueName, byte[] data,  WRType type) throws IOException, InterruptedException {
		String regString = createRegString(hkey,key,valueName,data,type,true);
		Process proc = Runtime.getRuntime().exec("REG ADD " + regString);
		proc.waitFor();
		
		return proc.exitValue() == REG_SUCCESS;
		
	}

	/**
	 * Shows a registry value
	 * @param hkey The root-key [ HKLM , HKCU ] 
	 * @param key the key name to open eg. SOFTWARE\TEST\ABCD
	 * @param valueName the name of the value 
	 * @return true on success
	 * @throws IOException
	 * @throws InterruptedException
	 * 
	 * @see WRKey
	 */
	public boolean showValue(WRKey hkey, String key, String valueName)  throws IOException, InterruptedException{
		String regString = createRegString(hkey,key,valueName,null,null,true);
		Process proc = Runtime.getRuntime().exec("REG QUERY " + regString);
		proc.waitFor();
		
		if(proc.exitValue()==REG_SUCCESS) {
		
			Scanner sc = new Scanner(proc.getInputStream());
			String str = "";
			do {
				str = sc.nextLine();
				System.out.println(str);
			}while(str != null);
		}
		else {
			System.err.println("Query failure..");
		}
		
		return proc.exitValue()==REG_SUCCESS;
	}
	
	
	/**
	 * 
	 * @param hkey The root-key [ HKLM , HKCU ] 
	 * @param key the key name to open eg. SOFTWARE\TEST\ABCD
	 * @param valueName the name of the value 
	 * @param withChildren view all subdirectories
	 * @return true on success
	 * @throws IOException
	 * @throws InterruptedException
	 * 
	 * @see WRKey
	 */
	public boolean showAllValues(WRKey hkey, String key, String valueName, boolean withChildren) throws IOException, InterruptedException {
		String regString = createRegString(hkey,key,null,null,null,false);
		Process proc = Runtime.getRuntime().exec("REG QUERY " + regString + "\\" + valueName + " " + (withChildren? " /s" :" "));
		proc.waitFor();
		
		
		if(proc.exitValue()==REG_SUCCESS) {
		
			Scanner sc = new Scanner(proc.getInputStream());
			
			String str = "";
			do {
				str = sc.nextLine();
				System.out.println(str);
				
			}while(sc.hasNext() && str != null);
			if(sc!=null) {
				sc.close();
			}
		}
		else {
			System.err.println("Query failure..\n" + regString);
		}
		
		
		return proc.exitValue()==REG_SUCCESS;
	}
	
	
	/**
	 * Sample program to access the windows registry
	 * 
	 * <br>
	 * NOTE: To create, modify or delete entries on HKEY_LOCAL_MACHINE you'll need elevated privileges
	 * 
	 * @param args
	 */
	public static void main(String ... args) {
		
		WinReg reg = new WinReg();
		
		try {
			
			// create a new registry key on HKEY_CURRENT_USER\\SOFTWARE\AAAA
			if( reg.addKey(WRKey.HKCU, "SOFTWARE\\AAAA") ) {
				System.out.println("Key created");
			}
			else {
				System.err.println("Error: could not create the key");
			}
			
			// create a new registry value on HKEY_CURRENT_USER\\SOFTWARE\AAAA  Name: sampleValue Type REG_SZ
			if( reg.addValue(WRKey.HKCU, "SOFTWARE\\AAAA", "sampleValue", "Tesalue".getBytes(), WRType.REG_SZ) ) {
				System.out.println("value created");
			}
			else {
				System.err.println("Error: could not create the value");
			}
			
			
			
			// list all registry values at HKEY_CURRENT_USER\\SOFTWARE\AAAA  with subdirectories
			if(! reg.showAllValues(WRKey.HKCU, "SOFTWARE\\AAAA", "", true) ) {
				System.err.println("Error: could not show the values");
			}
			
		}
		catch( InterruptedException | IOException e) {
			System.err.println("An error occurred. " + e.getMessage() );
		}
	}
	
}

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