Tuesday, December 23, 2008

System.getProperty()

something about System class
* Among the facilities provided by the System class are 
* 1. standard input, standard output, and error output streams; 
* 2. access to externally defined properties and environment variables; 
* 3. a means of loading files and libraries; 
* 4. and a utility method for quickly copying a portion of an array.
 使用System.getProperties().list(System.out);可以打印出所有的key及值 
Following table is from JDK document:

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
Posted by at

1 comment:

  1. UnknownDecember 23, 2008 at 11:28 PM

    1. for environment variables, you can define in your OS, and get the value via key in getProperty()
    2. for externally predefined properties, there should be two types:
    --one are the properties predefined by Sun, such as java.version, which you can get the details from JDK document.
    -- the other are the properties predefined by you via setProperty() method in System class.For example:
    ========================
    System.setProperty("osgi.parentClassloader", "app");
    System.setProperty("eclipse.ignoreApp", "true");
    System.setProperty("osgi.noShutdown", "true");
    System.setProperty("eclipse.stateSaveDelayInterval",
    "1000");
    System.setProperty("osgi.console", "9000");
    ===========================

    ReplyDelete

Subscribe to: Post Comments (Atom)