spring task 定时任务实现示例

2019-11-26 13:13:26

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一、引入spring相关jar包：

二、在web.xml中配置spring

<listener>  <description>Spring监听器</description>  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><context-param>  <param-name>contextConfigLocation</param-name>  <param-value>classpath:applicationContext.xml</param-value></context-param>

三、在applicationContext.xml中配置监听器

<?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: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/context  http://www.springframework.org/schema/context/spring-context-3.0.xsd  http://www.springframework.org/schema/task  http://www.springframework.org/schema/task/spring-task-3.0.xsd"  default-lazy-init="false">  <!-- 注解方式 -->  <context:annotation-config />  <context:component-scan base-package="com.test.task" />  <task:annotation-driven/>    <!-- XML方式 -->  <!-- <bean name="testTask" class="com.test.task.TestTask" lazy-init="false"></bean>  <task:scheduled-tasks>      <task:scheduled ref="testTask" method="print" cron="0/5 * * * * ?"/>    </task:scheduled-tasks> --></beans>

四、编写实体类

package com.test.task;import java.text.DateFormat;import java.util.Date;import org.springframework.scheduling.annotation.Scheduled;import org.springframework.stereotype.Component;@Componentpublic class TestTask {  @Scheduled(cron = "*/5 * * * * ?")  public void print(){    String time = DateFormat.getDateTimeInstance().format(new Date());    System.out.println("定时器触发打印"+time);  }}

五、工程目录：