springmvc之定时器

一、通过注解方式实现定时器

1、工程结构

2、所需jar包

3、spring-config.xml，springmvc配置文件

<?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:oxm="http://www.springframework.org/schema/oxm"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop"     xmlns:tx="http://www.springframework.org/schema/tx"    xmlns:task="http://www.springframework.org/schema/task"    xsi:schemaLocation="http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd       http://www.springframework.org/schema/oxm       http://www.springframework.org/schema/oxm/spring-oxm-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/aop          http://www.springframework.org/schema/aop/spring-aop-3.0.xsd         http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-3.2.xsd">    <!--  通知spring容器通过注解的方式装配bean -->       <context:annotation-config />     <!--  通知spring容器采用自动扫描机制查找注解的bean -->       <context:component-scan base-package="com.*" />       <task:annotation-driven /> <!-- 定时器开关-->       <!--  配置返回页面过滤 -->     <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">        <property name="viewClass"            value="org.springframework.web.servlet.view.JstlView" />        <property name="prefix" value="/" />        <property name="suffix" value=".jsp" />    </bean></beans>

注：下面是需要引入头路径：

xmlns:task="http://www.springframework.org/schema/task"  xsi:schemaLocation="http://www.springframework.org/schema/taskhttp://www.springframework.org/schema/task/spring-task-3.2.xsd"

 下面是定时器开关配置：

<task:annotation-driven/>

4、web.xml，加载springmvc配置

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">      <display-name>spring</display-name>        <!-- springmvc配置 -->      <servlet>        <servlet-name>springMVC</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>/WEB-INF/spring-config.xml</param-value>        </init-param>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>springMVC</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list></web-app>

5、TimerController.java

package com.timer;import java.text.SimpleDateFormat;import java.util.Date;import org.springframework.scheduling.annotation.Scheduled;import org.springframework.stereotype.Component;@Componentpublic class TimerController {     /**       * 每隔20秒执行一次      */        @Scheduled(fixedRate = 1000*20)       public void print(){          SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd H:m:s");        System.out.println("timer : "+format.format(new Date()));       }  }

 注：使用注解类前必须有@Component

二、通过配置xml文件实现定时器

1、spring-config.xml，springmvc配置

<?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:oxm="http://www.springframework.org/schema/oxm"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop"     xmlns:tx="http://www.springframework.org/schema/tx"    xmlns:task="http://www.springframework.org/schema/task"    xsi:schemaLocation="http://www.springframework.org/schema/beans       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd       http://www.springframework.org/schema/oxm       http://www.springframework.org/schema/oxm/spring-oxm-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/aop          http://www.springframework.org/schema/aop/spring-aop-3.0.xsd         http://www.springframework.org/schema/task       http://www.springframework.org/schema/task/spring-task-3.2.xsd">    <!--  通知spring容器通过注解的方式装配bean -->       <context:annotation-config />     <!--  通知spring容器采用自动扫描机制查找注解的bean -->       <context:component-scan base-package="com.*" />       <task:annotation-driven /> <!-- 定时器开关-->      <bean id="agentExcelTask" class="com.timer.TimerController1"/>    <task:scheduled-tasks>        <task:scheduled ref="agentExcelTask" method="print" cron="0/5 * * * * ?"/>    </task:scheduled-tasks>      <!--  配置返回页面过滤 -->     <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">        <property name="viewClass"            value="org.springframework.web.servlet.view.JstlView" />        <property name="prefix" value="/" />        <property name="suffix" value=".jsp" />    </bean></beans>

注： 多了创建bean和时间配置，每隔5秒触发一次，代码如下：

<bean id="agentExcelTask" class="com.timer.TimerController1"/>    <task:scheduled-tasks>        <task:scheduled ref="agentExcelTask" method="print" cron="0/5 * * * * ?"/>    </task:scheduled-tasks> 

注：method=”print”指明触发的为TimerController1类中的print方法。

2、TimerController1.java

package com.timer;import java.text.SimpleDateFormat;import java.util.Date;public class TimerController1 {    public void print(){        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd H:m:s");        System.out.println("timer1 : "+format.format(new Date()));      } }