java笔记

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System.getProperty("user.dir").这个是我在程序当中用的最多的，也是比较容易混淆的地方。解释为:用户当前的工作目录。所谓的当前的工作目录是指 ： 程序在那个地方运行这个目录就在那里。举个列子 ------

C:\Documents and Settings\sundl>D:
D:\>cd workspaces\Html
D:\workspaces\Html>java Test

这时，user.dir就成了D:\workspaces\Html