通过System获取java环境变量的路径

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<String,String> 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:UsersAdministratorAppDataLocal
6
NO
MS-20160512ARFF
\MS-20160512ARFF
C:jdk64jdk
Console
C:ProgramData
x86
C:Windowssystem32WindowsPowerShellv1.0Modules
C:
Destination=file
C:UsersAdministratorAppDataRoaming
Administrator
C:BVTBinTestsinstallpackagecsilogfile.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:ProgramDataOracleJavajavapath;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:jdk64jdkin;C:jdk64jdkjrein;D:JavaIdein;C:Program Files (x86)CanonEasy-WebPrint EXin;D:JavaIdemysqlinC:jdk64jdkin;C:jdk64jdkjrein;;C:UsersAdministratoreclipsejava-oxygeneclipse;
.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
Windows_NT
AMD64
3
MS-20160512ARFF
1
3a09
.;C:jdk64jdklib;C:jdk64jdklib	ools.jar
C:Program FilesCommon Files
C:Windowssystem32cmd.exe
C:ProgramData
C:Program Files
UsersAdministrator
C:Windows
C:UsersADMINI~1AppDataLocalTemp
C:
Intel64 Family 6 Model 58 Stepping 9, GenuineIntel
C:UsersAdministrator
C:UsersADMINI~1AppDataLocalTemp
C:Program Files (x86)Common Files
C:Program Files (x86)
C:UsersPublic
4
C:Windows
C:jdk64jdk
Windows 7