本例以Windows, JDK1.8 为基础，来演示使用Java 获取当前系统属性。

系统属性包括很多，如下：

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java.version         //Java version number
java.vendor          //Java vendor specific string
java.vendor.url      //Java vendor URL
java.home            //Java installation directory
java.class.version   //Java class version number
java.class.path      //Java classpath
os.name              //Operating System Name
os.arch              //Operating System Architecture
os.version           //Operating System Version
file.separator       //File separator ("/" on Unix)
path.separator       //Path separator (":" on Unix)
line.separator       //Line separator ("\n" on Unix)
user.name            //User account name
user.home            //User home directory
user.dir             //User's current working directory

获取系统指定属性

CurrentSystem.java

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package com.devnp.system;

public class CurrentSystem {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println("Java Version : " + System.getProperty("java.version")); 	//Java 版本
		System.out.println("Java Vendor : " + System.getProperty("java.vendor")); 	//Java 供应商
		System.out.println("Java vendor URL : " + System.getProperty("java.vendor.url")); 	//Java 供应商URL地址
		
		System.out.println("Java Installation Directory : " + System.getProperty("java.home")); 	//Java 安装路径
		System.out.println("Java class version number : " + System.getProperty("java.class.version")); 	//Java 版本号
		System.out.println("Java classpath : " + System.getProperty("java.class.path"));	//Java 类路径
		
		System.out.println("Operating System Name : " + System.getProperty("os.name"));		//操作系统名称
		System.out.println("Operating System Architecture : " + System.getProperty("os.arch"));		//操作系统架构
		System.out.println("Operating System Version : " + System.getProperty("os.version"));		//操作系统版本
		
		System.out.println("File separator : " + System.getProperty("file.separator"));		//文件分隔符
		System.out.println("Path separator : " + System.getProperty("path.separator"));		//路径分隔符
		System.out.println("Line separator : " + System.getProperty("line.separator"));		//行分隔符
		
		System.out.println("User account name : " + System.getProperty("user.name"));	//用户帐号名称
		System.out.println("User home directory : " + System.getProperty("user.home"));		//用户主目录
		System.out.println("User current working directory : " + System.getProperty("user.dir"));	//用户当前工作目录
		
	}

}
运行
以本地系统为测试： 
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Java Version : 1.8.0_111
Java Vendor : Oracle Corporation
Java vendor URL : http://java.oracle.com/
Java Installation Directory : D:\Java\jdk1.8.0_111\jre
Java class version number : 52.0
Java classpath : D:\eclipseworklace\personworkplace\Devnp-System\target\classes;D:\Program Files\apache-maven-3.1.0\osrepo\mysql\mysql-connector-java\5.1.28\mysql-connector-java-5.1.28.jar;D:\Program Files\apache-maven-3.1.0\osrepo\org\slf4j\slf4j-api\1.7.9\slf4j-api-1.7.9.jar;D:\Program Files\apache-maven-3.1.0\osrepo\org\slf4j\slf4j-log4j12\1.7.9\slf4j-log4j12-1.7.9.jar;D:\Program Files\apache-maven-3.1.0\osrepo\log4j\log4j\1.2.17\log4j-1.2.17.jar
Operating System Name : Windows 7
Operating System Architecture : amd64
Operating System Version : 6.1
File separator : \
Path separator : ;
Line separator : 

User account name : duliu
User home directory : C:\Users\duliu
User current working directory : D:\eclipseworklace\personworkplace\Devnp-System

获取系统全部属性

我们可以通过如下方法，来一次性获取全部属性： 
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Properties properties = System.getProperties() ;

如果想打印出全部属性，可以使用：

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System.getProperties().list(System.out);

或者使用：

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Properties properties = System.getProperties() ;

Enumeration enumeration = properties.propertyNames() ;

while (enumeration.hasMoreElements()) {
	String key = (String) enumeration.nextElement() ;
	
	System.out.println(key + " = " + properties.getProperty(key));
}