SpringBoot实现定时任务
文章目录
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.****.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