Springboot 开启异步任务Async，邮件发送任务，定时任务

@Service
public class AsyncService {
    @Async//异步任务注解的标志
    public  void  hello(){
        try {
            Thread.sleep(3000);
        }
        catch (InterruptedException e){
            e.printStackTrace();
        }
        System.out.println("数据正在处理中...");
    }
}

@RestController
public class AsyncController {
    @Autowired
    AsyncService asyncService;
    @RequestMapping("/h")
    public String hello(){
        asyncService.hello();//停止3秒
        return  "ok";
    }
}

<!-- http://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-mail -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
    <version>2.6.3</version>
</dependency>