1.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.zy</groupId>
    <artifactId>spring-boot-task-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-task-demo</name>
    <description>Demo project for Spring Boot</description
 
>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.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-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>

2.啟動類

package com.zy;

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

@SpringBootApplication
// 支持異步線程,需要異步調用的service層方法上面加上@Async註解,二者聯合,可起作用
@EnableAsync

//開啟基於註解的定時任務
@EnableScheduling

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

3.controller測試類

package com.zy.controller;

import com.zy.service.AsyncServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RequestMapping("/task/")
@RestController
public class AsyncController {

    @Autowired
    private AsyncServiceImpl asyncService;

    @RequestMapping("/async")
    public Object async(String name){
        return name;
    }
}

4.service層

4.1異步任務實現類

package com.zy.service;

import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service("asyncService")
public class AsyncServiceImpl {

    @Async
    public String async(String name){
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "good morning:" + name;
    }

}

4.2定時任務實現類

package com.zy.service;

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

@Service
public class ScheduledServiceImpl {


    /**
     * second(秒), minute（分）, hour（時）, day of month（日）, month（月）, day of week（周幾）.
     * 0 * * * * MON-FRI
     *  【0 0/5 14,18 * * ?】 每天14點整，和18點整，每隔5分鐘執行一次
     *  【0 15 10 ? * 1-6】 每個月的周一至周六10:15分執行一次
     *  【0 0 2 ? * 6L】每個月的最後一個周六淩晨2點執行一次
     *  【0 0 2 LW * ?】每個月的最後一個工作日淩晨2點執行一次
     *  【0 0 2-4 ? * 1#1】每個月的第一個周一淩晨2點到4點期間，每個整點都執行一次；
     */
    // @Scheduled(cron = "0 * * * * MON-SAT")
    //@Scheduled(cron = "0,1,2,3,4 * * * * MON-SAT")
    // @Scheduled(cron = "0-4 * * * * MON-SAT")


    @Scheduled(cron = "0/50 * * * * MON-SAT")  //每50秒執行一次
    public void saySchedule(){
        System.out.println("saySchedule");
    }
}

springboot中的任務(異步任務--定時任務--郵件任務)