本例依据Java自身提供的
接口实现,通过
监听器(Listener)和定时器(Timer)定时执行某个任务(Task)。
专业的开源工具可参考
Quartz:http://www.opensymphony.com/quartz/
MyListener:
import java.util.Timer;
import javax.servlet.
ServletContextEvent;
import javax.servlet.ServletContextListener;
public class MyListener implements ServletContextListener {
private Timer timer = null;
public void contextInitialized(ServletContextEvent event) {
timer = new Timer(true);
//设置任务计划,启动和间隔时间
timer.schedule(new MyTask(), 0, 86400000);
}
public void contextDestroyed(ServletContextEvent event) {
timer.
cancel();
}
}
MyTask:
import java.util.TimerTask;
public class MyTask extends TimerTask {
public void run() {
// System.out.println("call at " + (new Date()));
// TODO 此处添加具体任务代码
}
}
web.xml配置:
<listener>
<listener-class>com.fastunit.samples.listener.MyListener</listener-class>
</listener>
来自:http://www.blogjava.net/fastunit/archive/2008/02/15/180116.html