SpringBoot定时任务

项目中很多时候会使用到定时任务，这篇文章介绍一下springboot整合定时任务。

springboot整合定时任务其实就两点，
1.创建一个能被定时任务类，方法上加入@Scheduled注解
2.在启动类application上加入@EnableScheduling注解

代码如下，pom文件我只加入了devtools，其实不加入也可以

<?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.lanxiaobai</groupId>
    <artifactId>springboot_timing</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot_timing</name>
    <description>springboot_timing</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.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</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    <!-- 使Spring Boot应用支持热部署，无需手动重启Spring Boot应用。 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

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

</project>

application类代码如下：

@SpringBootApplication
@EnableScheduling
public class SpringbootTimingApplication {

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

定时任务类TestTimer

package com.lanxiaobai.timing.timer;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * @author lanxiaobai
 * @Description
 * @project springboot_learn
 * @package com.lanxiaobai.timing.timer
 * @ClassName TestTimer
 * @email 18801417651@163.com
 * @date 2018/10/1
 */
@Component
public class TestTimer {
    @Scheduled(cron = "0/1 * * * * ?")//cron = "0/1 * * * * ?"  0/1表示一秒执行一次
    private void test() {
        System.out.println("执行定时任务的时间是："+new Date());
    }
}

到这里启动项目，可以看到控制台如下

需要注意的是@Scheduled(cron = “0/1 * * * * ?”)中cron的值根据自己实际需要去写，如果需要可以去下面的网站去弄。
http://cron.qqe2.com/