JAVA Web定时执行任务

JAVA Web定时执行任务

1. 配置监听器

   在web.xml中添加监听器

   <listener>  
       <listener-class>com.aa.timer.TaskManagerlistener-class>  
   listener>

   监听类TaskManager

   import java.util.Calendar;
   import java.util.Timer;
   import javax.servlet.ServletContextEvent;
   import javax.servlet.ServletContextListener;
   import org.apache.commons.lang.time.DateUtils;
   
   public class TaskManager implements ServletContextListener{
        public  long t=DateUtils.MILLIS_PER_SECOND;
        /**  
         * 定时器  
         */  
       private Timer timer;  
       @Override
       public void contextDestroyed(ServletContextEvent sce) {
           // TODO Auto-generated method stub
           sce.getServletContext().log("[INFO]:timer shut down.");
       }
       @Override
       public void contextInitialized(ServletContextEvent sce) {
           // TODO Auto-generated method stub
           //定义定时器   
           sce.getServletContext().log("[INFO]:timer start.");  
           timer = new Timer("消息发送",true);    
           //启动备份任务,每月(4个星期)执行一次   
           //schedule(A,B,C) A:定时执行的函数，B：首次执行的时间（日期或延时） C：执行的时间间隔
           //timer.schedule(new MessagePusher(),t,30000); 
           timer.schedule(new MessagePusher(),t*10); 
       }
   }

2. 配置定时器MessagePusher

import java.util.Date;
import java.util.TimerTask;
import org.apache.log4j.Logger;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.zauther.weixin.service.ReminderService;

public class MessagePusher extends TimerTask{
    private static Logger logger = Logger.getLogger(MessagePusher.class);
    @Override
    public void run() {
        // TODO Auto-generated method stub
        System.out.println(new Date().toLocaleString());
        ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
        MessageSender messageSender=(MessageSender) ac.getBean("messageSender");
        messageSender.sendMessage();    
    }
}