public class TimerManager {
 
 //時(shí)間間隔
 private static final long PERIOD_DAY = 24 * 60 * 60 * 1000;
 
 public TimerManager() {
 Calendar calendar = Calendar.getInstance();
    
 /*** 定制每日2:00執(zhí)行方法 ***/
 
 calendar.set(Calendar.HOUR_OF_DAY, 2);
 calendar.set(Calendar.MINUTE, 0);
 calendar.set(Calendar.SECOND, 0);
  
 Date date=calendar.getTime(); //第一次執(zhí)行定時(shí)任務(wù)的時(shí)間
  
 //如果第一次執(zhí)行定時(shí)任務(wù)的時(shí)間 小于 當(dāng)前的時(shí)間
 //此時(shí)要在 第一次執(zhí)行定時(shí)任務(wù)的時(shí)間 加一天，以便此任務(wù)在下個(gè)時(shí)間點(diǎn)執(zhí)行。如果不加一天，任務(wù)會(huì)立即執(zhí)行。
 if (date.before(new Date())) {
   date = this.addDay(date, 1);
 }
  
 Timer timer = new Timer();
  
 NFDFlightDataTimerTask task = new NFDFlightDataTimerTask();
 //安排指定的任務(wù)在指定的時(shí)間開(kāi)始進(jìn)行重復(fù)的固定延遲執(zhí)行。
 timer.schedule(task,date,PERIOD_DAY);
 }
 
 // 增加或減少天數(shù)
 public Date addDay(Date date, int num) {
 Calendar startDT = Calendar.getInstance();
 startDT.setTime(date);
 startDT.add(Calendar.DAY_OF_MONTH, num);
 return startDT.getTime();
 }
 
}

public class NFDFlightDataTimerTask extends TimerTask {
 
 private static Logger log = Logger.getLogger(NFDFlightDataTimerTask.class);
 
 @Override
 public void run() {
 try {
  //在這里寫(xiě)你要執(zhí)行的內(nèi)容
  
 } catch (Exception e) {
  log.info("-------------解析信息發(fā)生異常--------------");
 }
 }
}
 
public class NFDFlightDataTaskListener implements ServletContextListener {
 
 public void contextInitialized(ServletContextEvent event) {
 new TimerManager();
 }
 
 public void contextDestroyed(ServletContextEvent event) {
 }
 
}

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