TimerTask定时任务

web.xml

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

监听器类

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) {}}

设置执行时间类

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();}}

要执行的任务方法

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);@Overridepublic 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--------------");}}
}