java获取所有系统变量

public static void getSysProp(){
Properties props = System.getProperties();
Set<Entry<Object,Object>> res = props.entrySet();
Iterator it = res.iterator();
while (it.hasNext())
{
Map.Entry e = (Map.Entry)it.next();
System.out.println(e.getKey()+"="+e.getValue());
}

}

结果

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

sun.boot.library.path=C:/Program Files/Java/jre1.5.0_16/bin

java.vm.version=1.5.0_16-b02

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

sun.java.launcher=SUN_STANDARD

user.country=CN

sun.os.patch.level=Service Pack 3

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

user.dir=D:/myeclipse-eclipse/workspace/JavaMail

java.runtime.version=1.5.0_16-b02

java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment

java.endorsed.dirs=C:/Program Files/Java/jre1.5.0_16/lib/endorsed

os.arch=x86

java.io.tmpdir=C:/DOCUME~1/WEIJIA~1.ZHO/LOCALS~1/Temp/

line.separator=

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

user.variant=

os.name=Windows XP

sun.jnu.encoding=GBK

java.library.path=lib目录

java.class.version=49.0

sun.management.compiler=HotSpot Client Compiler

os.version=5.1

user.home=用户目录

user.timezone=

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

file.encoding=UTF-8

java.specification.version=1.5

java.class.path=classpath路径

user.name=用户名

java.vm.specification.version=1.0

java.home=C:/Program Files/Java/jre1.5.0_16

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, sharing

java.version=1.5.0_16

java.ext.dirs=C:/Program Files/Java/jre1.5.0_16/lib/ext

sun.boot.class.path=C:/Program
Files/Java/jre1.5.0_16/lib/rt.jar;C:/Program
Files/Java/jre1.5.0_16/lib/i18n.jar;C:/Program
Files/Java/jre1.5.0_16/lib/sunrsasign.jar;C:/Program
Files/Java/jre1.5.0_16/lib/jsse.jar;C:/Program
Files/Java/jre1.5.0_16/lib/jce.jar;C:/Program
Files/Java/jre1.5.0_16/lib/charsets.jar;C:/Program
Files/Java/jre1.5.0_16/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.desktop=windows

sun.cpu.isalist=pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86