Tomcat 定时器 Timer

/**
 * TimerTaskCount.java
 * com.linkage.util
 *
 * Function： TODO 
 *
 *   ver     date      		author
 * ──────────────────────────────────
 *   		 Mar 10, 2010 		chengYu
 *
 * Copyright (c) 2010,  All Rights Reserved.
*/

package com.linkage.util.count;
/**
 * ClassName:TimerTaskCount
 * Project: 
 * Company: LINKAGE
 *
 * @author   chengYu
 * @version  
 * @since    Ver 1.1
 * @Date	 Mar 10, 2010		4:47:34 PM
 *
 * @see 	 
 */
import java.util.Timer;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TimerTaskCount implements ServletContextListener
{
	private final static Logger log = LoggerFactory.getLogger(TimerTaskCount.class);
	private Timer timer = null;
	public void contextInitialized(ServletContextEvent event)
	{
		log.info("-----------------监听器启动-----------------------");
//		在这里初始化监听器，在tomcat启动的时候监听器启动，可以在这里实现定时器功能
	    timer = new Timer(true);
	    log.info("---------------------------------------------------");
	    event.getServletContext().log("定时器已启动");//添加日志，可在tomcat日志中查看到
	    timer.schedule(new exportHistoryBean(event.getServletContext()),0l,(60*60*1000));
//	    调用exportHistoryBean，0表示任务无延迟，5*1000表示每隔5秒执行任务，60*60*1000表示一个小时。
	    event.getServletContext().log("已经添加任务");
	}
	public void contextDestroyed(ServletContextEvent event)
	{
//		在这里关闭监听器，所以在这里销毁定时器。
	    timer.cancel();
	    event.getServletContext().log("定时器销毁");
	}
}

/**
 * exportHistoryBean.java
 * com.linkage.util.count
 *
 * Function： TODO 
 *
 *   ver     date      		author
 * ──────────────────────────────────
 *   		 Mar 10, 2010 		chengYu
 *
 * Copyright (c) 2010,  All Rights Reserved.
*/

package com.linkage.util.count;
/**
 * ClassName:exportHistoryBean
 * Project: 
 * Company: LINKAGE
 *
 * @author   chengYu
 * @version  
 * @since    Ver 1.1
 * @Date	 Mar 10, 2010		5:15:18 PM
 *
 * @see 	 
 */
import java.util.Calendar;
import java.util.TimerTask;
import javax.servlet.ServletContext;
public class exportHistoryBean extends TimerTask
{
  private static final int C_SCHEDULE_HOUR = 0;
  private static boolean isRunning = false;
  private ServletContext context = null; 
  public exportHistoryBean(ServletContext context)
  {
      this.context = context; 
  }
 
  public void run()
  {
    Calendar c = Calendar.getInstance();
    if(!isRunning)
    {
      if(C_SCHEDULE_HOUR == c.get(Calendar.HOUR_OF_DAY))
      {
        isRunning = true;
        context.log("开始执行指定任务");
        //-------------------开始保存当日历史记录
       
       
        //在这里编写自己的功能，例：
        //File file = new File("temp");
        //file.mkdir();
        //启动tomcat，可以发现在tomcat根目录下，会自动创建temp文件夹
        
        //-------------------结束
        isRunning = false;
        context.log("指定任务执行结束");
      }
      else
      {
        context.log("上一次任务执行还未结束");
      }
    }
  }
}

web.xml

<!-- 定时器 -->
	<listener>
		<listener-class>com.linkage.util.count.TimerTaskCount</listener-class>
	</listener>