多线程－ScheduledExecutorService

落日映苍穹つ 2022-07-15 00:21 170阅读 0赞

转载：　http://blog.csdn.net/tsyj810883979/article/details/8481621

package cn.stu;
    
    import java.text.DateFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.concurrent.Executors;
    import java.util.concurrent.ScheduledExecutorService;
    import java.util.concurrent.TimeUnit;
    
    public class Main {
    	
    	static int count; 
    	
    	public static void main(String[] args){
    		
    	    final ScheduledExecutorService  executor = Executors.newScheduledThreadPool(1);
    	    
    //	    fixedDelay(executor);
    	    fixedRate(executor);
    	}
    
    	/**
    	 * 
    	* @Title: fixedRate 
    	* @Description: TODO   到了时间点就走， 订死的时间处理业务。 
    	* @param @param executor    设定文件 
    	* @return void    返回类型 
    	* @throws
    	 */
    	private static void fixedRate(final ScheduledExecutorService executor){
    	    long oneDay = 24 * 60 * 60 * 1000;  
    	    long initDelay  = getTimeMillis("16:19:00") - System.currentTimeMillis();  
    	    initDelay = initDelay > 0 ? initDelay : oneDay + initDelay;  
    	  
    	    executor.scheduleAtFixedRate(  
    	            new Runnable() {
    					
    					@Override
    					public void run() {
    						 
    						System.out.println("到点执行了......");
    						
    						executor.shutdown();
    					}
    				},  
    	            initDelay,  
    	            oneDay,  
    	            TimeUnit.MILLISECONDS);
    		
    	}
    	
    	
        /** 
         * 获取指定时间对应的毫秒数 
         * @param time "HH:mm:ss" 
         * @return 
         */  
        private static long getTimeMillis(String time) {  
            try {  
                DateFormat dateFormat = new SimpleDateFormat("yy-MM-dd HH:mm:ss");  
                DateFormat dayFormat = new SimpleDateFormat("yy-MM-dd");  
                Date curDate = dateFormat.parse(dayFormat.format(new Date()) + " " + time);  
                return curDate.getTime();  
            } catch (ParseException e) {  
                e.printStackTrace();  
            }  
            return 0;  
        }  
    	
    	
        /**
         * 
        * @Title: fixedDelay 
        * @Description: TODO  更偏向于计划， 计划几分钟等这样的， 不是一个固定死的时间来处理任务。 
        * @param @param executor    设定文件 
        * @return void    返回类型 
        * @throws
         */
    	private static void fixedDelay(final ScheduledExecutorService executor) {
    		executor.scheduleWithFixedDelay(new Runnable() {
    			
    			@Override
    			public void run() {
    
                     System.out.println("间隔2秒调用一次....");
                     count++;
                     if(count == 10){
                    	 executor.shutdown();
                     }
    			}
    		}, 0, 2000, TimeUnit.MILLISECONDS);
    	}
    
    }