1.重点是引入task的schema:
xmlns:task="http://www.springframework.org/schema/task" http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd
2.注解使用必须在xml中开启注解任务，使注解生效:
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 启动注解驱动的spring mvc 功能 -->
<mvc:annotation-driven />
<!-- 启动包扫描功能 -->
<context:component-scan
base-package="com.qingfeng.controller" />
<context:component-scan
base-package="com.qingfeng.service" />
<!-- 开启任务调度注解-->
<task:annotation-driven ></task:annotation-driven>>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
3.SpringTaskJob定时类
package com.qingfeng.service;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component//把普通pojo实例化到spring容器中，相当于配置文件中的<bean id="" class=""/>
public class SpringTaskJob {
@Scheduled(cron = "0/2 * * * * ?")
public void cron() {
System.out.println("执行定时任务，当前时间:"+System.currentTimeMillis());
}
}
4.输出结果
执行定时任务，当前时间:1602335496018 执行定时任务，当前时间:1602335498001 执行定时任务，当前时间:1602335500001 执行定时任务，当前时间:1602335502001 执行定时任务，当前时间:1602335504001 执行定时任务，当前时间:1602335506001 执行定时任务，当前时间:1602335508008