JavaWeb Timer&TimerTask 定时任务

JavaWeb 在程序启动时，定时执行计划任务。利用ServletContextListener在web服务启动时，启动计划任务

1.实现ServletContextListener接口，在contextInitialized()方法里建立Timer和TimerTask；

2.在TimerTask实现类里的run方法里写业务；

3.在web.xml配置配置；

代理片段：

1.

public class DealTableTimer implements ServletContextListener {
private static Timer timer = null;
public static Timer getTimer(){
if(timer==null) {
return timer = new Timer();
}
return timer;
}

public DealTableTimer() {
super();
}

@Override
public void contextInitialized(ServletContextEvent servletContextEvent) {
if(timer == null) {
getTimer();
}
servletContextEvent.getServletContext().log("【INFO】定时器启动.");
timer.schedule(new DealTableTimerTask(),1000,5000);
}

@Override
public void contextDestroyed(ServletContextEvent servletContextEvent) {
timer.cancel();
servletContextEvent.getServletContext().log("【INFO】定时器结束.");
}

}

2.

public class DealTableTimerTask extends TimerTask {
@Override
public void run() {
//.....
}
}

3.web.xml

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