Spring的简单定时任务的实现

搭建最简单的Spring定时任务工程：

1.把Spring通过web.xml注册进来：

1 <!-- 加载spring容器 -->
2     <context-param>
3         <param-name>contextConfigLocation</param-name>
4         <param-value>/WEB-INF/classes/spring/applicationContext-*.xml</param-value>
5     </context-param>
6     <listener>
7         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
8     </listener>

2.需要告诉Spring去哪儿扫描组件，在此我使用的是注解的方式，所以要告诉Spring我们是使用注解方式注册任务的，我的配置文件是applicationContext-service.xml

 1 <beans xmlns="http://www.springframework.org/schema/beans"
 2     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3     xmlns:mvc="http://www.springframework.org/schema/mvc"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop"
 6     xmlns:tx="http://www.springframework.org/schema/tx"
 7     xmlns:task="http://www.springframework.org/schema/task"
 8     xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
 9         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
10         http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd
11         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
12         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
13         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
14     <!-- 新闻的service -->
15     <!-- <bean id="newsService" class="com.ssm.service.impl.NewsServiceImpl" /> -->
16     <context:component-scan base-package="com.ssm.service.*"></context:component-scan>
17     <context:annotation-config />
18     <task:annotation-driven/>//使用的注解方式来实现Spring的定时任务
19
20     <!-- 开启这个配置，spring才能识别@Scheduled注解     -->
21     <!-- <task:annotation-driven scheduler="qbScheduler" mode="proxy"/>
22     <task:scheduler id="qbScheduler" pool-size="10"/>  -->
23 </beans>

3.注册一个简单的任务，在service下新建一个包task，然后创建一个Spider类，类的的内容表示每逢10秒执行，打印一个语句

 1 package com.ssm.service.task;
 2
 3 import java.util.Date;
 4
 5 import org.springframework.scheduling.annotation.Scheduled;
 6 import org.springframework.stereotype.Component;
 7 import org.springframework.stereotype.Service;
 8
 9
10 @Component("spider")
11 public class Spider {
12
13     @Scheduled(fixedRate=10*1000)
14     public void getNews(){
15         System.out.println(new Date()+"-------getNews");
16     }
17 }

4.运行结果：