spring自带的定时任务功能，基于注解和xml配置

基于注解和xml的配置，可以分离出来单独使用。

1、spring的配置文件

 1 <beans xmlns="http://www.springframework.org/schema/beans"
 2     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 3     xmlns:p="http://www.springframework.org/schema/p"
 4     xmlns:task="http://www.springframework.org/schema/task"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xmlns:aop="http://www.springframework.org/schema/aop" 
 7     xsi:schemaLocation="http://www.springframework.org/schema/beans 
 8     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
 9     http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd  
10     http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd  
11     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd  
12     http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd  
13     http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd">
14 
15     <task:annotation-driven /> <!-- 定时器开关-->
16 
17     <bean id="myTaskXml" class="com.spring.task.MyTaskXml"></bean>
18 
19     <task:scheduled-tasks>
20         <!-- 
21             这里表示的是每隔五秒执行一次 
22         -->
23         <task:scheduled ref="myTaskXml" method="show" cron="*/5 * * * * ?" />
24         <task:scheduled ref="myTaskXml" method="print" cron="*/10 * * * * ?"/>
25     </task:scheduled-tasks>
26     
27     <!-- 自动扫描的包名 -->  
28     <context:component-scan base-package="com.spring.task" />
29     
30 </beans>

2、基于xml的定时任务

 1 package com.spring.task;
 2 
 3 /**
 4  * 基于xml的定时器
 5  * @author hj
 6  */
 7 public class MyTaskXml {
 8     
 9     
10     public void show(){
11         System.out.println("XMl:is show run");
12     }
13     
14     public void print(){
15         System.out.println("XMl:print run");
16     }
17 }

3、基于注解的定时器任务

 1 package com.spring.task;
 2 
 3 import org.springframework.scheduling.annotation.Scheduled;
 4 import org.springframework.stereotype.Component;
 5 
 6 /**
 7  * 基于注解的定时器
 8  * @author hj
 9  */
10 @Component
11 public class MyTaskAnnotation {
12     
13     /** 
14      * 定时计算。每天凌晨 01:00 执行一次 
15      */  
16     @Scheduled(cron = "0 0 1 * * *") 
17     public void show(){
18         System.out.println("Annotation：is show run");
19     }
20     
21     /** 
22      * 心跳更新。启动时执行一次，之后每隔2秒执行一次 
23      */  
24     @Scheduled(fixedRate = 1000*2) 
25     public void print(){
26         System.out.println("Annotation：print run");
27     }
28 }

4、测试

 1 package com.spring.test;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 
 7 public class Main {
 8     public static void main(String[] args) {
 9         ApplicationContext ctx = new ClassPathXmlApplicationContext("spring-mvc.xml");
10     }
11 }