获得系统属性

System.getProperty()参数大全 
查资料用:
java.version Java Runtime Environment version
java.vendor Java Runtime Environment vendor
java.vendor.url Java vendor URL
java.home Java installation directory
java.vm.specification.version Java Virtual Machine specification version
java.vm.specification.vendor Java Virtual Machine specification vendor
java.vm.specification.name Java Virtual Machine specification name
java.vm.version Java Virtual Machine implementation version
java.vm.vendor Java Virtual Machine implementation vendor
java.vm.name Java Virtual Machine implementation name
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor
java.specification.name Java Runtime Environment specification name
java.class.version Java class format version number
java.class.path Java class path
java.library.path List of paths to search when loading libraries
java.io.tmpdir Default temp file path

java.compiler Name of JIT compiler to use
java.ext.dirs Path of extension directory or directories
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's account name
user.home User's home directory
user.dir User's current working directory

中文对照：

java.version Java 运行时环境版本

java.vendor Java 运行时环境供应商

java.vendor.url Java 供应商的 URL

java.home Java 安装目录

java.vm.specification.version Java 虚拟机规范版本

java.vm.specification.vendor Java 虚拟机规范供应商

java.vm.specification.name Java 虚拟机规范名称

java.vm.version Java 虚拟机实现版本
java.vm.vendor Java 虚拟机实现供应商

java.vm.name Java 虚拟机实现名称

java.specification.version Java 运行时环境规范版本

java.specification.vendor Java 运行时环境规范供应商

java.specification.name Java 运行时环境规范名称

java.class.version Java 类格式版本号

java.class.path Java 类路径

java.library.path 加载库时搜索的路径列表

java.io.tmpdir 默认的临时文件路径

java.compiler 要使用的 JIT 编译器的名称

java.ext.dirs 一个或多个扩展目录的路径

os.name 操作系统的名称

os.arch 操作系统的架构

os.version 操作系统的版本

file.separator 文件分隔符（在 UNIX 系统中是“/”）

path.separator 路径分隔符（在 UNIX 系统中是“:”）

line.separator 行分隔符（在 UNIX 系统中是“/n”）

user.name 用户的账户名称

user.home 用户的主目录

user.dir 用户的当前工作目录

 

代码：

public static void main(String[] args) {
   System.out.println("java.version:" + System.getProperty("java.version"));
   System.out.println("java.vendor:" + System.getProperty("java.vendor"));
   System.out.println("java.vendor.url:" + System.getProperty("java.vendor.url"));
   System.out.println("java.home:" + System.getProperty("java.home"));
   System.out.println("java.vm.specification.version:" + System.getProperty("java.vm.specification.version"));
   System.out.println("java.vm.specification.vendor:" + System.getProperty("java.vm.specification.vendor"));
   System.out.println("java.vm.specification.name:" + System.getProperty("java.vm.specification.name"));
   System.out.println("java.vm.version:" + System.getProperty("java.vm.version"));
   System.out.println("java.vm.vendor:" + System.getProperty("java.vm.vendor"));
   System.out.println("java.vm.name:" + System.getProperty("java.vm.name"));
   System.out.println("java.specification.version:" + System.getProperty("java.specification.version"));
   System.out.println("java.specification.vendor:" + System.getProperty("java.specification.vendor"));
   System.out.println("java.specification.name:" + System.getProperty("java.specification.name"));
   System.out.println("java.class.version:" + System.getProperty("java.class.version"));
   System.out.println("java.class.path:" + System.getProperty("java.class.path"));
   System.out.println("java.library.path:" + System.getProperty("java.library.path"));
   System.out.println("java.io.tmpdir:" + System.getProperty("java.io.tmpdir"));
   System.out.println("java.compiler:" + System.getProperty("java.compiler"));
   System.out.println("java.ext.dirs:" + System.getProperty("java.ext.dirs"));
   System.out.println("os.name:" + System.getProperty("os.name"));
   System.out.println("os.arch:" + System.getProperty("os.arch"));
   System.out.println("os.version:" + System.getProperty("os.version"));
   System.out.println("file.separator:" + System.getProperty("file.separator"));
   System.out.println("line.separator:" + System.getProperty("line.separator"));
   System.out.println("user.name:" + System.getProperty("user.name"));
   System.out.println("user.home:" + System.getProperty("user.home"));
   System.out.println("user.dir:" + System.getProperty("user.dir"));
}

运行结果：

java.version:1.6.0_02
java.vendor:Sun Microsystems Inc.
java.vendor.url:http://java.sun.com/
java.home:D:/Program Files/Java/jdk1.6.0_02/jre
java.vm.specification.version:1.0
java.vm.specification.vendor:Sun Microsystems Inc.
java.vm.specification.name:Java Virtual Machine Specification
java.vm.version:1.6.0_02-b06
java.vm.vendor:Sun Microsystems Inc.
java.vm.name:Java HotSpot(TM) Client VM
java.specification.version:1.6
java.specification.vendor:Sun Microsystems Inc.
java.specification.name:Java Platform API Specification
java.class.version:50.0
java.class.path:E:/workspace/test/WebRoot/WEB-INF/classes;E:/workspace/test/WebRoot/WEB-INF/lib/activation.jar;

java.library.path:D:/Program Files/Java/jdk1.6.0_02/bin;.;C:/WINDOWS/Sun/Java/bin;C:/WINDOWS/system32;C:/WINDOWS;C:/WINDOWS/system32;C:/WINDOWS;C:/WINDOWS/System32/Wbem;C:/Program Files/Common Files/Thunder Network/KanKan/Codecs;C:/Program Files/Microsoft SQL Server/80/Tools/BINN;C:/Program Files/Microsoft SQL Server/80/Tools/Binn/;C:/Program Files/Microsoft SQL Server/90/DTS/Binn/;C:/Program Files/Microsoft SQL Server/90/Tools/binn/;C:/Program Files/Microsoft SQL Server/90/Tools/Binn/VSShell/Common7/IDE/;C:/Program Files/Microsoft Visual Studio 8/Common7/IDE/PrivateAssemblies/;D:/Program Files/Java/jdk1.6.0_02/bin;C:/Program Files/Common Files/Adobe/AGL;C:/Program Files/SinoVoice/jTTS 5.0 Desktop/Bin;E:/J2EE/plugins/ant/apache-ant-1.7.1/bin;C:/Program Files/CVSNT;C:/Program Files/StormII/Codec;C:/Program Files/StormII
java.io.tmpdir:C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/
java.compiler:null
java.ext.dirs:D:/Program Files/Java/jdk1.6.0_02/jre/lib/ext;C:/WINDOWS/Sun/Java/lib/ext
os.name:Windows 2003
os.arch:x86
os.version:5.2
file.separator:/
line.separator:

user.name:Administrator
user.home:C:/Documents and Settings/Administrator
user.dir:E:/workspace/mvnforum