spring boot定时任务

1、在IDEA上创建一个springboot工程（示例是使用maven管理jar）

2、在pom.xml中添加jar包的地址

<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>
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>
</dependencies>

3、改造项目启动类加注解（@EnableScheduling）

package com.demo.timing;

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

@EnableScheduling
@SpringBootApplication
public class TimingApplication {

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

4、编写任务接口

    （1）正则表达式实现

package com.demo.timing.core;

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

@Component
public class TimingTask01 {
    private int count=0;

    @Scheduled(cron = "*/6 * * * * ?")
    private void pr(){
        System.out.println("this is running"+count++);
    }
}

    （2）每隔定长时间执行任务(起好项目立刻执行一次)

@Component
public class TimigTask02 {

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

    @Scheduled(fixedRate = 6000)
    public void reportCurrentTime() {
        System.out.println("现在时间：" + dateFormat.format(new Date()));
    }

}

 5、执行结果