spring task 定时任务实现

Posted 2020-07-28

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;

@Component
public 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：

运行结果：