Question

在我的项目中，我需要在注册后发送电子邮件以激活帐户。还需要在某些事件上发送其他电子邮件。任何人都可以帮助我如何异步实现这一点。我是否需要在应用程序中发送电子邮件的方法上使用@Async，或者我需要创建一些从应用程序组件接收jms消息并发送电子邮件的JMS组件。请建议我如何解决这个问题。

此致

Answer 1

为电子邮件发件人编写服务类，并在触发电子邮件的邮件上添加@Async注释。

假设您的组件正在触发电子邮件

@Controller
public class OrderController {

@Autowired
private MailSenderUtilityService mailSenderUtilityService;

       @RequestMapping("/setShippingAddress")
       private String sendAnEmail(Model model, Order order, User user){
            ..... Your code goes here .....

       mailSenderUtilityService.sendYourEmail(Order order, User user, Locale english);

         return "emailSent";
        }
    }





@Service
public class MailSenderUtilityService {


        @Autowired
        private JavaMailSender mailSender;

        @Autowired
        private MailConstructor mailContructor;

        @Async
        public void sendOrderSubmittedEmail(Order order, User user, Locale english) {

            CompletableFuture<MimeMessagePreparator> email = mailContructor.constructSimpleOrderPlacedEmail(order, user, Locale.ENGLISH);       
            try {
                System.out.println("********************* SLEEPING NOW FOR TESTING PURPOSE **********************");
                Thread.sleep(60000);
                mailSender.send(email.get());
            } catch (MailException | InterruptedException | ExecutionException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }       
        }
}

@Component
public class MailConstructor {

    @Autowired
    private Environment env;

    @Autowired
    private TemplateEngine templateEngine;

    @Async
    public CompletableFuture<MimeMessagePreparator> constructSimpleOrderPlacedEmail(Order order, User user, Locale locale) {

        Context context = new Context();
        context.setVariable("order", order);
        context.setVariable("user", user);
        context.setVariable("cartItemList", order.getCartItemList());
        String text = templateEngine.process("orderConfirmationEmailTemplate", context);

        MimeMessagePreparator messagePreparator = new MimeMessagePreparator() {

            @Override
            public void prepare(MimeMessage mimeMessage) throws Exception {
                MimeMessageHelper email = new MimeMessageHelper(mimeMessage);
                email.setTo(user.getEmail());
                email.setFrom(new InternetAddress("abhibookstore123@gmail.com"));
                email.setSubject("Order Confirmation - "+ order.getId());
                email.setText(text, true);              
            }
        };

        return CompletableFuture.completedFuture(messagePreparator);
    }

这将以异步方式触发您的电子邮件。在发送电子邮件之前，它不会等待60秒。

控制器中的代码执行将继续，60秒后将触发电子邮件。

在这里，您可以找到完整的示例 - here

Answer 2

除了@Abhinavece的答案，您还必须在应用程序中启用Async


@SpringBootApplication
**@EnableAsync**
public class SpringPrimeFacesApplication {

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

  @Bean
  SessionRegistry sessionRegistry() { 
      return new SessionRegistryImpl(); 
  }

  @Bean
  public ActiveUserStore activeUserStore(){
      return new ActiveUserStore();
  }
}

想要异步发送来自java应用程序的电子邮件

2 个答案: