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)。
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);
timer.schedule(new MyTask(), 0, 86400000);// milliseconds
}
public void contextDestroyed(ServletContextEvent event) {
timer.cancel();
}
}
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);
timer.schedule(new MyTask(), 0, 86400000);// milliseconds
}
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
}
}
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 >
< listener-class > com.fastunit.samples.listener.MyListener </ listener-class >
</ listener >