网海渔夫

1:编写定时执行任务

package test;

import java.util.Timer;
import java.util.TimerTask;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class TimeTastDemo implements ServletContextListener {

 public void contextDestroyed(ServletContextEvent arg0) {
  // TODO Auto-generated method stub

 }

 public void contextInitialized(ServletContextEvent arg0) {
  TimerTask task = new TimerTask() {
   public void run() {
    System.out.println("Run Task.....");
   }
  };
  Timer timer = new Timer();
  timer.schedule(task, 0, 2000);

 }
}

2:在web.xml添加

 <listener>
      <listener-class>test.TimeTastDemo</listener-class>
  </listener>