SpringBoot实现定时任务

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开发环境

• JDK 1.8
• springboot版本 1.5.12
  springboot实现定时任务相当简单, 只需两步.

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.thc</groupId>
	<artifactId>springboot-04-task</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>springboot-06-task</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.12.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-mail</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

主启动类

在启动类加上如下的注解
@EnableScheduling 表示开启基于注解的定时任务

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

//开启基于注解的定时任务
@EnableScheduling 
@SpringBootApplication
public class Springboot04TaskApplication {

	public static void main(String[] args) {
		SpringApplication.run(Springboot04TaskApplication.class, args);
	}
}

在service类写定时任务的方法

在方法上加上@Scheduled ,表示这是一个定时任务的方法.
后面写上定时任务的表达式.
关于定时任务的表达式,可以看我另一篇文章.
https://blog.csdn.net/qq_33229669/article/details/85013881
也可以在如下的网页中,进行定时任务的在线生成. 要去掉最后一位年. 因为spring的cron表达式,只支持 秒分时日月星期, 六位. 如果是七位会报错
http://cron.qqe2.com/

@Service
public class ScheduledService {
	@Scheduled(cron = "* * * * * ?")
    public void hello(){
        System.out.println("hello ... ");
    }
}

启动工程后,效果如下图