spring task scheduled task implementation example

1. Introduce spring-related jar packages:

2. Configure spring in web.xml

<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>

3. Configure the listener in applicationContext.xml

<?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>

4. Write the entity class

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);
  }
}

5. Project directory:

Running results:

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