获得所有java System属性，实验所得，非文档拷贝，最全

package job;

import java.util.Enumeration;
import java.util.TreeMap;

public class SysProperties {

	/**
	 * @author shijin
	 * @param args
	 */
	public static void main(String[] args) {
		//先获得系统属性的Properties对象，继而获得所有Property名称的枚举
		Enumeration<?> e = System.getProperties().propertyNames();
		//TreeMap是SortedMap的现阶段唯一实现，保证key有序；用来有序地保存系统属性
		TreeMap<String,String> ptmap = new TreeMap<String,String>();
		while(e.hasMoreElements()) {
			String key = (String)e.nextElement();
			String value = System.getProperty(key);
			ptmap.put(key, value);
		}
		for(String key : ptmap.keySet()) {
			//格式化输出，第一个字符串左对齐，宽30
			System.out.format("%-30s%s", key,ptmap.get(key));
			System.out.println();
		}
	}
}

输出：

awt.toolkit                   sun.awt.windows.WToolkit
file.encoding                 GBK
file.encoding.pkg             sun.io
file.separator                \
java.awt.graphicsenv          sun.awt.Win32GraphicsEnvironment
java.awt.printerjob           sun.awt.windows.WPrinterJob
java.class.path               E:\JAVA\workplace\j2eeworkspace\tools\bin
java.class.version            50.0
java.endorsed.dirs            C:\Program Files\Java\jre6\lib\endorsed
java.ext.dirs                 C:\Program Files\Java\jre6\lib\ext;C:\WINDOWS\Sun\Java\lib\ext
java.home                     C:\Program Files\Java\jre6
java.io.tmpdir                C:\DOCUME~1\shijin\LOCALS~1\Temp\
java.library.path             C:\Program Files\Java\jre6\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:/Program Files/Java/jre6/lib/i386;H:\app\shijin\product\11.1.0\db_1\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Common Files\Thunder Network\KanKan\Codecs;C:\Program Files\Java\jdk1.6.0_13\bin;C:\Program Files\Java\jdk1.6.0_13\jre\bin;C:\Program Files\PuTTY;;C:\Program Files\MySQL\MySQL Server 5.0\bin;;C:\Program Files\DBank\ClickUp;C:\Program Files\DBank\ClickUp;H:\eclipse-jee-indigo-SR2-win32\eclipse;;.
java.runtime.name             Java(TM) SE Runtime Environment
java.runtime.version          1.6.0_26-b03
java.specification.name       Java Platform API Specification
java.specification.vendor     Sun Microsystems Inc.
java.specification.version    1.6
java.vendor                   Sun Microsystems Inc.
java.vendor.url               http://java.sun.com/
java.vendor.url.bug           http://java.sun.com/cgi-bin/bugreport.cgi
java.version                  1.6.0_26
java.vm.info                  mixed mode, sharing
java.vm.name                  Java HotSpot(TM) Client VM
java.vm.specification.name    Java Virtual Machine Specification
java.vm.specification.vendor  Sun Microsystems Inc.
java.vm.specification.version 1.0
java.vm.vendor                Sun Microsystems Inc.
java.vm.version               20.1-b02
line.separator                

os.arch                       x86
os.name                       Windows XP
os.version                    5.1
path.separator                ;
sun.arch.data.model           32
sun.boot.class.path           C:\Program Files\Java\jre6\lib\resources.jar;C:\Program Files\Java\jre6\lib\rt.jar;C:\Program Files\Java\jre6\lib\sunrsasign.jar;C:\Program Files\Java\jre6\lib\jsse.jar;C:\Program Files\Java\jre6\lib\jce.jar;C:\Program Files\Java\jre6\lib\charsets.jar;C:\Program Files\Java\jre6\lib\modules\jdk.boot.jar;C:\Program Files\Java\jre6\classes
sun.boot.library.path         C:\Program Files\Java\jre6\bin
sun.cpu.endian                little
sun.cpu.isalist               pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86
sun.desktop                   windows
sun.io.unicode.encoding       UnicodeLittle
sun.java.command              job.SysProperties
sun.java.launcher             SUN_STANDARD
sun.jnu.encoding              GBK
sun.management.compiler       HotSpot Client Compiler
sun.os.patch.level            Service Pack 2
user.country                  CN
user.dir                      E:\JAVA\workplace\j2eeworkspace\tools
user.home                     C:\Documents and Settings\shijin
user.language                 zh
user.name                     shijin
user.timezone                 
user.variant