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 ("\n" 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：System.getProperty("user.dir")