System.getProperty(String key)的用法

System.getProperty(String key)是个很有用的方法，这个方法很简单，使用中主要问题是这个函数的参数key是系统预设的。下面列出的是sunJava doc里面给出的key值：

Key	Description of Associated Value
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

 

url：http://java.sun.com/j2se/1.5.0/docs/api/java/lang/System.html#getProperties()

 

这些key值是常用的，不同的系统还有不同的key值。如果想查看当前系统的其他属性key值，可用下面的语句：

    java.util.Properties properties = System.getProperties();
    properties.list(System.out);