任务

1、异步任务

@SpringBootApplication
//开启异步注解的功能
@EnableAsync
public class SpringbootTaskApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootTaskApplication.class, args);
    }
}

/**
 * 异步任务
 */
@Service
public class AsyncService {
    /**
     * 告诉spring这是一个异步的方法
     */
    @Async
    public void hello(){
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("数据正在处理...");
    }
}

@RestController
public class AstncController {
    @Autowired
    AsyncService asyncService;

    @RequestMapping("/hello")
    public String hello(){
        //停止3秒
        asyncService.hello();
        return "ok";
    }
}

2、邮件发送

<!--邮件发送-->
 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

spring.mail.username=xxx@qq.com
spring.mail.password=xxx
spring.mail.host=smtp.qq.com
# 开启加密验证
spring.mail.properties.mail.smtp.ssl.enable=true

package com.sjx.springboottask;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

@SpringBootTest
class SpringbootTaskApplicationTests {

    @Autowired
    JavaMailSenderImpl mailSender;

    @Test
    void contextLoads() {
        //一个简单的邮件
        SimpleMailMessage mailMessage = new SimpleMailMessage();
        mailMessage.setSubject("测试");
        mailMessage.setText("使用springboot发送邮件....");
        mailMessage.setTo("xxx@qq.com");
        mailMessage.setFrom("xxx@qq.com");
        mailSender.send(mailMessage);
    }

    @Test
    void contextLoads2() throws MessagingException {
        //一个复杂的邮件
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        //组装
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);
        helper.setSubject("复杂邮件测试");
        helper.setText("<p style='color:red'>测试！测试！！！！</p>",true);
        //附件
        helper.addAttachment("1.jpg",new File("D:\\Desktop\\1.jpg"));
        helper.setTo("xxx@qq.com");
        helper.setFrom("xxx@qq.com");
        mailSender.send(mimeMessage);
    }

}

3、定时任务

TaskScheduler 任务调度者
TaskExecutor  任务执行者

@EnableScheduling //开启定时功能的注解
@Scheduled

@Service
public class ScheduledService {
    /**
     * cron 表达式
     * 秒 分 时 日 月 周几~
     * 0 14 16 * * ?  每天的16点14分  执行一次
     * 0 0/5 16,17 * * ?   每天16点和17点，每隔5分钟执行一次
     * 0 15 10 ? * 1-6  每个月的周一到周六 10点15执行一次
     */

    @Scheduled(cron = "0 14 16 * * ?")
    public void hello(){
        System.out.println("hello，你被执行了");
    }
}