Java系统属性

系统属性是指与用户程序相关的操作系统配置信息以及软件信息。通常与用户程序相关的属性关键字包括：

　　●file.separator:文件分隔符，Windows环境下为“"，Unix环境下为“/”；

　　●user.home：用户主目录；

　　●java.home：Java实时运行环境的安装目录；

　　●java.ext.dirs：JDK的'安装目录；

　　●os.name：操作系统名称；

　　●user.name：用户登录名称；

　　●os.version：操作系统版本；

　　●path.separator：当前操作系统的路径分隔符；

　　●user.dir：当前用户程序所在目录。

如果想要查看所有的系统属性，可以编写如下代码sysEnv.java

import java.util.Iterator;

import java.util.Properties;

public class sysEnv {

public static void main(String args[])

{

Properties props=System.getProperties();

Iterator iter=props.keySet().iterator();

while(iter.hasNext())

{

String key=(String)iter.next();

System.out.println(key+

}

}

}

运行此java代码，就可以看到所有的系统属性和对应的值了。

例如，我本机运行后的结果：

java.runtime.name = Java(TM) 2 Runtime Environment, Standard Edition

sun.boot.library.path = C:\j2sdk1.4.2_09\jre\bin

java.vm.version = 1.4.2_09-b05

java.vm.vendor = Sun Microsystems Inc.

java.vendor.url = http://java.sun.com/

path.separator = ;

java.vm.name = Java HotSpot(TM) Client VM

file.encoding.pkg = sun.io

user.country = CN

sun.os.patch.level = Service Pack 2

java.vm.specification.name = Java Virtual Machine Specification

user.dir = E:\eclipse\testDemo

java.runtime.version = 1.4.2_09-b05

java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment

java.endorsed.dirs = C:\j2sdk1.4.2_09\jre\lib\endorsed

os.arch = x86

java.io.tmpdir = C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\

line.separator =

java.vm.specification.vendor = Sun Microsystems Inc.

user.variant =

os.name = Windows XP

sun.java2d.fontpath =

java.library.path = C:\j2sdk1.4.2_09\bin;.;C:\WINDOWS\system32;C:\WINDOWS;C:\j2sdk1.4.2_09\bin;d:\oracle\ora92\bin;C:\Program Files\Oracle\jre\1.1.8\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;D:\MySQL\MySQL Server 4.1\bin;d:\Program Files\IDM Computer Solutions\UltraEdit-32

java.specification.name = Java Platform API Specification

java.class.version = 48.0

java.util.prefs.PreferencesFactory = java.util.prefs.WindowsPreferencesFactory

os.version = 5.1

user.home = C:\Documents and Settings\Administrator

user.timezone =

java.awt.printerjob = sun.awt.windows.WPrinterJob

file.encoding = GBK

java.specification.version = 1.4

java.class.path = E:\eclipse\testDemo\bin;E:\eclipse\lucene-1.4.3\lucene-2.0.0\lucene-2.0.0\lucene-core-2.0.0.jar;E:\Library\commons\commons-io-1.1.jar;E:\Library\commons\commons-net-1.1.0.jar;F:\everyday\6月\15\je-analysis-1[1].2.2.jar;E:\Library\junit\junit.jar

user.name = Cral

java.vm.specification.version = 1.0

java.home = C:\j2sdk1.4.2_09\jre

sun.arch.data.model = 32

user.language = zh

java.specification.vendor = Sun Microsystems Inc.

awt.toolkit = sun.awt.windows.WToolkit

java.vm.info = mixed mode

java.version = 1.4.2_09

java.ext.dirs = C:\j2sdk1.4.2_09\jre\lib\ext

sun.boot.class.path = C:\j2sdk1.4.2_09\jre\lib\rt.jar;C:\j2sdk1.4.2_09\jre\lib\i18n.jar;C:\j2sdk1.4.2_09\jre\lib\sunrsasign.jar;C:\j2sdk1.4.2_09\jre\lib\jsse.jar;C:\j2sdk1.4.2_09\jre\lib\jce.jar;C:\j2sdk1.4.2_09\jre\lib\charsets.jar;C:\j2sdk1.4.2_09\jre\classes

java.vendor = Sun Microsystems Inc.

file.separator = \

java.vendor.url.bug = http://java.sun.com/cgi-bin/bugreport.cgi

sun.io.unicode.encoding = UnicodeLittle

sun.cpu.endian = little

sun.cpu.isalist = pentium i486 i386