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import java.io.*;

import java.util.*;

/**

* Description:

* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>

* <br/>Copyright (C), 2001-2016, Yeeku.H.Lee

* <br/>This program is protected by copyright laws.

* <br/>Program Name:

* <br/>Date:

* @author Yeeku.H.Lee kongyeeku@163.com

* @version 1.0

*/

public class SystemTest

{

public static void main(String[] args) throws Exception

{

// 获取系统所有的环境变量

Map<String,String> env = System.getenv();

for (String name : env.keySet())

{

System.out.println(name + " ---> " + env.get(name));

}

// 获取指定环境变量的值

System.out.println(System.getenv("JAVA_HOME"));

// 获取所有的系统属性

Properties props = System.getProperties();

// 将所有系统属性保存到props.txt文件中

props.store(new FileOutputStream("props.txt")

, "System Properties");

// 输出特定的系统属性

System.out.println(System.getProperty("os.name"));

}

}