Java获得系统 SystemProperties

 package com.tianze.jmsn.test;
import java.util.*;

public class SystemProperties
{

        public static void main(String[] args)
        {  
            Properties props = System.getProperties();
            List keyList = new ArrayList();
            keyList.addAll( props.keySet());
            Collections.sort(keyList);
            for(int i=0;i<keyList.size();i++){
                String key = (String)keyList.get(i);
                System.out.println(key+"="+props.getProperty(key));
            }
           
            System.out.println( new Date() );
            try{
                 Thread.sleep(60*1000);
            }catch(Exception e){
                   
            }
            System.out.println( new Date() );
           
        }

}