SpringBoot: asynchronous processing

Asynchronous Processing

Project structure

1. Creating SpringBoot project, add a web support

2. Write hello project

   @RestController
   public class AsyncController {
   
       @Autowired
       AsyncService asyncService;
   
       @GetMapping("/hello")
       public String hello(){
           asyncService.asynService();
           return "OK";
       }
   
   }

    

3. Analog Delay

   @Service
    public  class AsyncService { 
   
       public  void asynService () {
            the try { 
               the Thread.sleep ( 3000 ); 
           } the catch (InterruptedException E) { 
               e.printStackTrace (); 
           } 
           System.out.println ( "Data Processing ..." ) ; 
       } 
   
   
   }

    

   Browser access, you need to wait until three seconds, now help us solve by SpringBoot

4. SpringBoot open asynchronous processing

   Analogue delay class

   @Service
     public  class AsyncService { 
        // tell spring is a need for a method that asynchronous processing 
        @Async
         public  void asynService () {
             the try { 
                the Thread.sleep ( 3000 ); 
            } the catch (InterruptedException E) { 
                e.printStackTrace (); 
            } 
            System.out.println ( "data processing ..." ); 
        } 
    }

    

   The main program category

   //开启异步处理
    @EnableAsync
    @SpringBootApplication
    public class Springboot09AsyncApplication {
    ​
        public static void main(String[] args) {
            SpringApplication.run(Springboot09AsyncApplication.class, args);
        }
    ​
    }

    

   Send e-mail

   1, import-dependent

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

    

   2, the configuration file

   Configuration information of the sender

   = 649 318 307 spring.mail.username @ qq.com 
    spring.mail.password = csnfxxjqxkgibeja 
    spring.mail.host = smtp.qq.com 
    # QQ messages sent need to open the encrypted authentication 
    spring.mail.properties.mail.smtp.ssl. enable = to true

   3, send e-mail

   JavaMailSenderImpl class is a good package, for sending mail

   @SpringBootTest
     class Springboot09AsyncApplicationTests { 
        @Autowired 
        JavaMailSenderImpl javaMailSender; 
        // simple mail 
        @Test
         void contextLoads () { 
            SimpleMailMessage MailMessage = new new SimpleMailMessage (); 
            // title 
            mailMessage.setSubject ( "Hello stuff in the zxh" );
             // text 
            mailMessage.setText ( "I wish you happy !!" ); 
            // specify a sender 
            mailMessage.setFrom ( "[email protected]" );
             // specify the recipient
            mailMessage.setTo ( "[email protected]" ); 
            javaMailSender.send (MailMessage); 
        } 
        // complex messages 
        @Test
         void senderMail () throws MessagingException { 
            the MimeMessage MimeMessage = javaMailSender.createMimeMessage ();
         // assembled ~, open file upload 
            MimeMessageHelper Helper = new new MimeMessageHelper (MimeMessage, to true );
             // title 
            helper.setSubject ( "Hello stuff in the zxh" );
             // text, using html parsing 
            helper.setText ( "<p style = ' color: red;'> I wish you a happy !! </ p> ",true);
            //附件
            helper.addAttachment("术语.md", new File("C:\\Users\\HP\\Desktop\\术语.md"));
    ​
            helper.setFrom("[email protected]");
            helper.setTo("[email protected]");
    ​
            javaMailSender.send(mimeMessage);
        }
    ​
    }

   Scheduled Task

   SpringBoot comes with four objects on timed tasks:

   • @Scheduled: When execution

     • cron expression

   • @EnableScheduling: open timer

   • TaskExecutor: mandate holders

   • TaskScheduler: Task Scheduler

   1, regular tasks

   @Service
    public  class ScheduledService {
        // tell SpringBoot when executed
        // cron expression: the sun and moon seconds timeshare week, once every two seconds to perform 
       @Scheduled (cron = "0/2 * * * *?" )
        Public  void the Hello () { 
           System.out.println ( "Hello" ); 
       } 
   }

   2, open the regular tasks

    //开启定时功能
    @EnableScheduling
    @SpringBootApplication
    public class Springboot09AsyncApplication {
    ​
        public static void main(String[] args) {
            SpringApplication.run(Springboot09AsyncApplication.class, args);
        }
    ​
    }