(1)、程式碼如下：
	package com.sundy.task;

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

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

	public class MyTimerTask implements ServletContextListener{
		private Timer timer;
		@Override
		public void contextDestroyed(ServletContextEvent arg0) {
			if(timer!=null) timer.cancel();
		}

		@Override
		public void contextInitialized(ServletContextEvent arg0) {
			timer = new Timer();
			timer.schedule(new TimerTask() {
				
				@Override
				public void run() {
					work();
				}
			}, 1000, 15*1000);// 一秒後執行，間隔十五秒執行一次。
		}
		
		private void work() {
			System.out.println("定時任務....");
		}
	}
(2)、需要在web.xml中增加
	<listener>
		<listener-class>com.sundy.task.MyTimerTask</listener-class>
	</listener>
 

二、JavaWeb專案中Spring自帶的定時任務的使用簡介

1)、非註解的開發
	1.1、普通的JavaBean
	package com.sundy.task;

	public class MyTask {
		public void task(){
			System.out.println("定時任務...");
		}
	}
1.2、在applicationContext.xml中的配置如下。
	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:task="http://www.springframework.org/schema/task"
		xmlns:context="http://www.springframework.org/schema/context"
		xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/task
		http://www.springframework.org/schema/task/spring-task-4.2.xsd">
		
		<bean id="myTask" class="com.sundy.task.MyTask"></bean>
		 <task:scheduled-tasks> 
			<!-- cron的表示式可參考《http://blog.csdn.net/evilcry2012/article/details/51991791》 -->
			<task:scheduled ref="myTask" method="task" cron="*/5 * * * * ?"/> <!-- 每隔五秒執行一次com.sundy.task.MyTask類中的task()方法 -->
		</task:scheduled-tasks> 
	</beans>
1.3、在web中記得增加：
	<!-- 載入spring容器 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:applicationContext.xml</param-value>
	</context-param>
	
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
(2)、註解的開發
2.1、普通的JavaBean
	package com.sundy.task;

	import org.springframework.scheduling.annotation.Scheduled;
	import org.springframework.stereotype.Component;

	@Component
	public class MyTask {
		@Scheduled(cron="*/5 * * * * ?")
		public void task1(){
			System.out.println("定時任務...");
		}
	}
2.2、在applicationContext.xml中的配置
	<context:component-scan base-package="com.sundy.task"/>
	<!-- 配置任務線性池 -->  
    <task:executor id="executor" pool-size="10" />  
    <task:scheduler id="scheduler" pool-size="10" />  
	<task:annotation-driven scheduler="scheduler" executor="executor" proxy-target-class="true"/>
 

三、定時任務quartz的簡單使用

(1)、官網下載地址：http://www.quartz-scheduler.org/downloads/
	任務排程開源框架Quartz動態新增、修改和刪除定時任務 地址：http://blog.csdn.net/luo201227/article/details/37511137
(2)、非註解的簡單示例(參考：http://veiking.iteye.com/blog/2371511)
1.1、普通的JavaBean
	package com.sundy.quartz;

	public class SimpleJob {
		public void runTask() {
			System.out.println("runTask()....");
		}
	}
1.2、Spring配置檔案
	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:task="http://www.springframework.org/schema/task"
		xmlns:context="http://www.springframework.org/schema/context"
		xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/task
		http://www.springframework.org/schema/task/spring-task-4.2.xsd">
		
		<bean id="simpleJob" class="com.sundy.quartz.SimpleJob"></bean> 
		 
		 <bean id="simpleJobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
			<property name="targetObject" ref="simpleJob"/>    
			<property name="targetMethod" value="runTask"/>    
			<property name="concurrent" value="false"/>    
			<!-- concurrent : false表示等上一個任務執行完後再開啟新的任務 -->   
		 </bean>   
		<!-- 配置任務排程的時間/週期、延時 -->    
		<bean id="simpleJobDetailTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">    
			<property name="jobDetail" ref="simpleJobDetail"/>  
			<property name="cronExpression" value="*/10 * * * * ?"/>    
			<property name="startDelay" value="3000"/>  
		</bean> 
		<!-- 配置任務排程中心 -->  
		<bean id="schedulerFactoryBean"  class="org.springframework.scheduling.quartz.SchedulerFactoryBean">    
			<property name="triggers">    
				<list>    
				 <ref bean="simpleJobDetailTrigger"/>  
				</list>  
			</property>    
		</bean>  
	</beans>