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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());
}

}

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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=libĿ¼
java.class.version=49.0
sun.management.compiler=HotSpot Client Compiler
os.version=5.1
user.home=Óû§Ä¿Â¼
user.timezone=
java.awt.printerjob=sun.awt.windows.WPrinterJob
file.encoding=UTF-8
java.specification.version=1.5
java.class.path=classpath·¾¶
user.name=̞
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