spring注解定时器

上一篇文章写了一个在配置文件中设置时间的定时器，现在来写一个注解方式的定时器：

1.工程结构如下：

2.需要执行的代码块：

 package com.Task;

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

 @Component
 public class TaskDemo {
     private static int sf = 0;

     @Scheduled(cron = "0/5 * * * * ?")
     public void testTask(){
         sf++;
         System.out.println("5秒输出一次。。。。。sf:"+sf);
     }
 }

注意：不要忘记@Component，否则配置文件扫描不到需要执行的代码块；
3.

 <?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:context="http://www.springframework.org/schema/context"
     xmlns:tx="http://www.springframework.org/schema/tx" xmlns:task="http://www.springframework.org/schema/task"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
     http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/tx
     http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
     http://www.springframework.org/schema/task
     http://www.springframework.org/schema/task/spring-task-3.0.xsd
     http://www.springframework.org/schema/aop
     http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

     <context:component-scan base-package="com"/>  

     <task:annotation-driven/>   

 </beans>

说明：相对于上一遍的配置文件的设置时间方式，这种方式就简单多了，

如果启动过程中报：The prefix "task" for element "task:annotation-driven" is not bound.错误，

则需要在beans中加：

xmlns:task="http://www.springframework.org/schema/task"
xmlns:aop="http://www.springframework.org/schema/aop"

4.web.xml配置文件：

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.5"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
   <display-name></display-name>
   <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>

   <servlet>
     <servlet-name>dispatcherServlet</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>
                  classpath:conf/spring-task.xml
             </param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
 </servlet>
 </web-app>

web.xml配置的信息目的就是让spring-task.xml文件生效；

5.相关jar包：http://pan.baidu.com/s/1qYwCrBQ

6.部署到tomcat上启动即可；

注解时间设置和上一篇文章一样；