Question

当我进入/ confirmation-account链接时，在tomcat控制台中我可以看到if和else块也被执行了。我可以看到：

从ColorConsoleHelper.getGreenLog（＆＃34; loginView＆＃34;）和ColorConsoleHelper.getGreenLog（＆＃34; confirmationAccountView＆＃34;）

打印

这真是一种奇怪的行为。为什么呢？

 @RequestMapping(value = "/confirmation-account", method = RequestMethod.GET)
 @Transactional
 public ModelAndView displayConfirmationAccountPage(ModelAndView modelAndView,  @RequestParam Map<String, String> requestParams) {

    final int ACTIVE_USER   = 1;

    // find the user associated with the confirmation token
    UserEntity userEntity = userService.findUserByConfirmationToken(requestParams.get("token"));

    // this should always be non-null but we check just in case
    if (userEntity!=null) {

        // set the confirmation token to null so it cannot be used again
        userEntity.setConfirmationToken(null);

        // set enabled user
        userEntity.setEnabled(ACTIVE_USER);

        // save data: (token to null and active user)
        saveAll(userEntity.getTrainings());

        /*
            RedirectAttributes won't work with ModelAndView but returning a string from the redirecting handler method works.
         */

        modelAndView.addObject("successMessage", "Konto zostało pomyślnie aktywowane!");
        modelAndView.setViewName("loginView");
        ColorConsoleHelper.getGreenLog("loginView");

    } else {

        ColorConsoleHelper.getGreenLog("confirmationAccountView");
        modelAndView.addObject("errorMessage", "Link jest nieprawidłowy...");
        modelAndView.setViewName("confirmationAccountView");
    }

    return modelAndView;
}


public void saveAll(List<TrainingUserEntity> trainingUserEntityList) {
    for ( TrainingUserEntity trainingUserEntity : trainingUserEntityList) {
        entityManagerService.mergeUsingPersistenceUnitB(trainingUserEntity);
    }
}

public void mergeUsingPersistenceUnitB(Object object) {
     EntityManager entityManager = getEntityManagerPersistenceUnitB();
     EntityTransaction tx        = null;
     try {
         tx = entityManager.getTransaction();
         tx.begin();
         entityManager.merge(object);
         tx.commit();
     } 
     catch (RuntimeException e) {
         if ( tx != null && tx.isActive() ) tx.rollback();
         throw e; // or display error message
     }
     finally {
         entityManager.close();
     }
 }

Answer 1

以下解决方案＆amp;说明：

由于/ confirmation-account链接被调用两次，因此在控制器中注释的动态代理和@Transactional方法导致的内容必须检查调用了多少displayConfirmationAccountPage方法。这是解决方法。

您认为对@Transactional控制器方法进行注释有什么好处？

如果在Spring方法中执行了else和else块，则注释为Transactional

1 个答案: