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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<listener>
<listener-class>com.TimeLister</listener-class>
</listener>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
package com;
import java.util.Timer;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class TimeLister implements ServletContextListener {
private Timer timer;
public void contextDestroyed(ServletContextEvent sce) {
timer.cancel();
System.out.println("定时器销毁!");
}
public void contextInitialized(ServletContextEvent sce) {
timer=new Timer(true);
TimeTest timeTest=new TimeTest();
System.out.println("定时器销毁!");
timer.schedule(timeTest,1000,2000);
//1000是启动后1秒后开始运行
//2000是每次运行后2秒后再次运行,你要每小时那就是1000*60*60
//timer.schedule(timeTest,1000,1000*60*60);
}
}
package com;
import java.util.Date;
import java.util.TimerTask;
public class TimeTest extends TimerTask{
public void run() {
Date date =new Date();
System.out.println("操作开始:"+date.toLocaleString());
System.out.println("正在操作,请稍候!");
try {
Thread.sleep(2000);//让线程停2秒,你不想要可以去掉。
//写你的操作!!!!!!!!!!!!!!!!!!!!!!!!!!!
//这里的数据库操作我就不给你做了,这个你肯定会的。
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("操作结束:"+date.toLocaleString());
System.out.println("");
}
}