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；