java - Spring MVC 自定义事件扩展了 ApplicationEvent 调用两次

Question

我已经根据本教程 http://www.baeldung.com/registration-verify-user-by-email 在我的 Spring 应用程序中完成了用户注册电子邮件确认。

遇到一个奇怪的问题。由于未知原因，我的自定义事件总是触发 2 次。

代码如下:事件:

public class OnRegistrationCompleteEvent extends ApplicationEvent {
    private final String appUrl;
    private final Locale locale;
    private final User user;

    public OnRegistrationCompleteEvent(User user, Locale locale, String appUrl) {
        super(user);

        this.user = user;
        this.locale = locale;
        this.appUrl = appUrl;
    }

    public String getAppUrl() {
        return appUrl;
    }
    public Locale getLocale() {
        return locale;
    }
    public User getUser() {
        return user;
    }
}

听众:

@Component
public class RegistrationListener implements ApplicationListener<OnRegistrationCompleteEvent> {

    private final static Logger logger = LogManager.getLogger(RegistrationListener.class.getName());


    @Autowired
    private JavaMailSender mailSender;

    @Override
    public void onApplicationEvent(OnRegistrationCompleteEvent event) {
        this.confirmRegistration(event);
    }

    private void confirmRegistration(OnRegistrationCompleteEvent event) {
        logger.info("OnRegistrationCompleteEvent confirmSocialPosting fired");
        final User user = event.getUser();

        String recipientAddress = user.getEmail();
        String subject = "Registration Confirmation";
        String from = "contactblablabla@gmail.com";

        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper helper = null;
        try {
            helper = new MimeMessageHelper(mimeMessage, false, "utf-8");
            String htmlMsg = "Your account was successfully registered! <br><br>" +
                    "username: "+user.getUsername()+"<br>"+
                    "password: "+user.getPassword()+"<br>";

            mimeMessage.setContent(htmlMsg, "text/html");
            helper.setTo(new InternetAddress(recipientAddress));
            helper.setSubject(subject);
            helper.setFrom(new InternetAddress(from));
            mailSender.send(mimeMessage);
        } catch (MessagingException e) {
            logger.error("Message creation exception: "+e.getMessage());
        }
    }
}

Controller :

@RequestMapping(value = "/register", method = RequestMethod.POST)
@ResponseBody
public JsonResponse AddUser(@RequestBody @Valid User user, WebRequest request) throws SQLException {
        String result = userService.RegisterUser(user);
        if(result.equals("done")) {
            try {
                String appUrl = request.getContextPath();
                eventPublisher.publishEvent(new OnRegistrationCompleteEvent(user, request.getLocale(), appUrl));
            } catch (Exception me) {
                return new JsonResponse("FAIL", "Unknown on event publishing: "+ me.getMessage());
            }
            return new JsonResponse("OK", "");

        } else if(result.equals("duplicate")) {
            return new JsonResponse("FAIL", "duplicate");
        }
        return new JsonResponse("FAIL", "Unknown");
}

因此，在我的日志中，我触发了 OnRegistrationCompleteEvent recognizeSocialPosting 2 次。并发送 2 封电子邮件。可能是什么问题？

Answer 1

这是因为它注册了两次。您在应用程序中使用注释，即 base-package="com.example"这就是它两次注册的原因

从监听器类中删除注释 @component 并在 .xml 文件中定义 bean 定义

这个工作!!