通过System获取java环境变量的路径代码为:

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Map;

import java.util.Properties;

public class Sys {

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

//获取素所有的环境变量

Map env = System.getenv();

for (String name : env.keySet()) {

System.out.println(env.get(name));

}

//获取指定环境变量的值

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

//获取所有系统属性

Properties props = System.getProperties();

//将所有的系统文件保存

props.store(new FileOutputStream("C:\\Users\\Administrator\\Desktop\\配置.txt"),"System Properties");

//输出特定的系统属性

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

}

}

输出结果为:

C:\Users\Administrator\AppData\Local

6

NO

MS-20160512ARFF

\\MS-20160512ARFF

C:\jdk64\jdk

Console

C:\ProgramData

x86

C:\Windows\system32\WindowsPowerShell\v1.0\Modules\

C:

Destination=file

C:\Users\Administrator\AppData\Roaming

Administrator

C:\BVTBin\Tests\installpackage\csilogfile.log

C:\Program Files (x86)

C:\Program Files (x86)\Common Files

C:/Program Files (x86)/Java/jre1.8.0_144/bin/client;C:/Program Files (x86)/Java/jre1.8.0_144/bin;C:/Program Files (x86)/Java/jre1.8.0_144/lib/i386;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\jdk64\jdk\bin;C:\jdk64\jdk\jre\bin;D:\JavaIde\bin;C:\Program Files (x86)\Canon\Easy-WebPrint EX\bin;D:\JavaIde\mysql\binC:\jdk64\jdk\bin;C:\jdk64\jdk\jre\bin;;C:\Users\Administrator\eclipse\java-oxygen\eclipse;

.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC

Windows_NT

AMD64

3

MS-20160512ARFF

1

3a09

.;C:\jdk64\jdk\lib;C:\jdk64\jdk\lib\tools.jar

C:\Program Files\Common Files

C:\Windows\system32\cmd.exe

C:\ProgramData

C:\Program Files

\Users\Administrator

C:\Windows

C:\Users\ADMINI~1\AppData\Local\Temp

C:

Intel64 Family 6 Model 58 Stepping 9, GenuineIntel

C:\Users\Administrator

C:\Users\ADMINI~1\AppData\Local\Temp

C:\Program Files (x86)\Common Files

C:\Program Files (x86)

C:\Users\Public

4

C:\Windows

C:\jdk64\jdk

Windows 7