12.异步任务，发送邮件，定时代码

1.配置

# 应用名称
spring.application.name=task-springboot
# 应用服务 WEB 访问端口
server.port=8080
spring.mail.username=565482647@qq.com
spring.mail.password=kcdolulfhhfvbfjb
#发送的服务器
spring.mail.host=smtp.qq.com
#开启加密
spring.mail.properties.mail.smtp.ssl.enable=true

2.在主函数中增加注释

@EnableAsync//开启异步注解功能
@EnableScheduling//开启定时功能的注解
@SpringBootApplication
public class TaskSpringbootApplication {

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

}

3.测试邮件发送

@SpringBootTest
class TaskSpringbootApplicationTests {
@Autowired
    JavaMailSenderImpl mailSender;
    @Test
    void contextLoads() {
        //一个简单的邮件
        SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
        simpleMailMessage.setSubject("你好老沙");
        simpleMailMessage.setText("我本来可以写个循环每隔一秒发送一封，可是我没有，所以我是个好人");
        simpleMailMessage.setTo("1418084771@qq.com");
        simpleMailMessage.setFrom("565482647@qq.com");
        mailSender.send(simpleMailMessage);
    }
    @Test
    void contextLoads2() throws MessagingException {
        //一个复杂的邮件
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        //组装
        MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage,true);//true开启多文件
        mimeMessageHelper.setSubject("写给自己的邮件");
        mimeMessage.setText("谢谢你 带我来");
        //mimeMessageHelper.addAttachment("1.png",new File("C:\\Users\\56548\\Desktop\\1.png"));
        mimeMessageHelper.setTo("2945826643@qq.com");
        mimeMessageHelper.setFrom("565482647@qq.com");
        mailSender.send(mimeMessage);
    }

}

4.用于异步的代码

@Service
public class AsyncService {
    //告诉spring这是一个异步的办法 测试一个异步方法
    @Async
    public void hello(){
        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(
                "数据正在处理...."
        );
    }
}

5.用于定时的代码

@Service
public class ScheduledService {
    //秒 分 时 日 月 周几
    //每天的13.24执行代码
    //cron表达式-逆天
    @Scheduled(cron="0 24 13 * * ?")
    public void hello(){
        System.out.println("你被执行了");
    }
}

6.Controller-->测试异步

@RestController
public class AsyncController {
    @Autowired
    AsyncService asyncService;
    @RequestMapping("/hello")
    public String hello(){
        asyncService.hello();
        return "ok";
    }
}