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/task http://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; @Component public 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())); } }
注：时间格式参考
