Java 定时任务

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * 设置开始时间开启任务，间隔时间执行任务，结束时间关闭任务
 * 
 * @author 
 *
 */
public class ScheduldeExecutorTest {

	 //线程池能按时间计划来执行任务，允许用户设定计划执行任务的时间，int类型的参数是设定  
	 //线程池中线程的最小数目。当任务较多时，线程池可能会自动创建更多的工作线程来执行任务  
	 //此处用Executors.newSingleThreadScheduledExecutor()更佳。
	     public ScheduledExecutorService scheduExec = Executors.newScheduledThreadPool(1);  

	 //启动计时器  
	 public void lanuchTimer(){  
	      Runnable task = new Runnable() {  
	             public void run() {  
	                      throw new RuntimeException();  
	                  }  
	              };  
	              scheduExec.scheduleWithFixedDelay(task, 1000*5, 1000*10, TimeUnit.MILLISECONDS);  
	 }  
	 
	 //添加新任务  
	 public void addOneTask(){  
	      Runnable task = new Runnable() {  
	              public void run() { 
	            	  //获取本系统时间，如果大于设定的时间就关闭服务
	            	  SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
	            	  String nowDate=df.format(new Date());
	            	  int c=timeCompare("2017-01-20 10:42:00", nowDate);
	            	  if(0>c){
	            		  System.out.println(nowDate+"时间到，关闭任务！");
	            		  scheduExec.shutdown();
	            	  }else{
	            		  System.out.println("==来了"); 
	            	  }
	            }  
	          };  
	          scheduExec.scheduleWithFixedDelay(task, 1000*1, 2000, TimeUnit.MILLISECONDS);  
	 }  
	 /*时间比大小*/  
	    public static int timeCompare(String t1,String t2){  
	        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
	        Calendar c1=Calendar.getInstance();  
	        Calendar c2=Calendar.getInstance();  
	        try {  
	            c1.setTime(formatter.parse(t1));  
	            c2.setTime(formatter.parse(t2));  
	        } catch (Exception e) {  
	            e.printStackTrace();  
	        }  
	        int result=c1.compareTo(c2);  
	        return result;  
	    }  
	
	 
	 public static void main(String[] args) throws Exception { 
		 //开启
		 ScheduldeExecutorTest test = new ScheduldeExecutorTest();  
		          test.lanuchTimer();  
		        //Thread.sleep(1000*5);//5秒钟之后添加新任务  
		          test.addOneTask();		 
		
	} 
}