一直做Web应用一般不会用到这些东西，今天在搞一个代码生成器的东西，发现这个值得收藏：

      System.getProperty()参数大全 
     
    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 (" " on UNIX) 
    user.name            User's account name 
    user.home            User's home directory 
    user.dir                User's current working directory  

使用方法很简单：System.getProperty("user.dir")