[Java知识库]定时任务、邮件任务、异步任务

异步任务

1. AsyncService

@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.....");
    }
}

2. AsyncController

@RestController
public class AsyncController {

    @Autowired
    AsyncService asyncService;

    @RequestMapping("/hello")
    public String hello() {
        asyncService.hello(); //停止三秒,转圈
        return "ok";
    }
}

3. Springboot09TestApplication

开启异步注解功能

//开启异步注解功能
@EnableAsync
@SpringBootApplication
public class Springboot09TestApplication {

    public static void main(String[] args) {
        SpringApplication.run(Springboot09TestApplication.class, args);
    }

}

邮件任务

1. application.properties

spring.mail.username=592939739@qq.com
spring.mail.password=evvzcockcwfvbbed
spring.mail.host=smtp.qq.com
# 开启加密验证
spring.mail.properties.mail.smtl.ssl.enable=true

2. Springboot09TestApplicationTests

@SpringBootTest
class Springboot09TestApplicationTests {

    @Autowired
    JavaMailSenderImpl mailSender;

    @Test
    void contextLoads() {
        SimpleMailMessage mailMessage = new SimpleMailMessage();
		//标题
        mailMessage.setSubject("山东菏泽~");
        mailMessage.setText("666");
		//发送给
        mailMessage.setTo("592939739@qq.com");
        mailMessage.setFrom("592939739@qq.com");

        mailSender.send(mailMessage);
    }
}

定时执行任务

TaskScheduler  任务调度者
TaskExecutor   任务执行者

//开启定时功能的注解
@EnableScheduling
@Scheduled //什么时候执行

Cron表达式

1. 开启定时功能注解

//开启定时功能的注解
@EnableScheduling

2. ScheduleService

@Service
public class ScheduleService {

    //在一个特定的时间执行这个方法
    //cron 表达式~
    //秒 分 时 日 月 周几~
    @Scheduled(cron = "0 13 1 * * ?")
    public void hello() {
        System.out.println("hello，你被执行了");
    }
}