TimerTask定时任务

<listener>
       <listener-class>com.sign.listener.NFDFlightDataTaskListener</listener-class>
    </listener>

package com.sign.listener;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import com.sign.time.TimerManager;

public class NFDFlightDataTaskListener implements ServletContextListener{

         public void contextInitialized(ServletContextEvent event) {
            new TimerManager();
         }
         
         public void contextDestroyed(ServletContextEvent event) {}
   
}

package com.sign.time;

import java.util.Calendar;
import java.util.Date;
import java.util.Timer;

public class TimerManager {
    //时间间隔
     private static final long PERIOD_DAY = 24 * 60 * 60 * 1000;
      
     public TimerManager() {
      Calendar calendar = Calendar.getInstance();
            
      /*** 定制每日11:23执行方法 ***/
     
      calendar.set(Calendar.HOUR_OF_DAY, 11);
      calendar.set(Calendar.MINUTE, 23);
      calendar.set(Calendar.SECOND, 0);
       
      Date date=calendar.getTime(); //第一次执行定时任务的时间
       
      //如果第一次执行定时任务的时间 小于 当前的时间
      //此时要在 第一次执行定时任务的时间 加一天，以便此任务在下个时间点执行。如果不加一天，任务会立即执行。
      if (date.before(new Date())) {
          date = this.addDay(date, 1);
      }
       
      Timer timer = new Timer();
       
      NFDFlightDataTimerTask task = new NFDFlightDataTimerTask();
      //安排指定的任务在指定的时间开始进行重复的固定延迟执行。
      timer.schedule(task,date,PERIOD_DAY);
     }
     
     // 增加或减少天数
     public Date addDay(Date date, int num) {
      Calendar startDT = Calendar.getInstance();
      startDT.setTime(date);
      startDT.add(Calendar.DAY_OF_MONTH, num);
      return startDT.getTime();
     }
      
}

package com.sign.time;

import java.util.Date;
import java.util.TimerTask;

import org.apache.log4j.Logger;

public class NFDFlightDataTimerTask extends TimerTask {
    private static Logger log = Logger.getLogger(NFDFlightDataTimerTask.class);
     
     @Override
     public void run() {
      try {
       //在这里写你要执行的内容
          System.out.println((new Date()).toLocaleString());
          System.out.println("KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK");
        
      } catch (Exception e) {
       log.info("-------------解析信息发生异常--------------");
      }
     }
}