java - 如何检查 Throwable 是否是由无效电子邮件地址导致的

Question

注意:我当前的解决方案正在运行(我认为)。我只是想确保我没有遗漏任何东西。

我的问题:我想知道如何检查是否因电子邮件地址无效而导致异常。使用 Java 邮件。

目前我正在检查SMTPAddressFailedException与getAddress()和 AddressException与getRef() .

这是我当前进行检查的方法。 我错过了什么吗？

/**
* Checks to find an invalid address error in the given exception. Any found will be added to the ErrorController's
* list of invalid addresses. If an exception is found which does not contain an invalid address, returns false.
*
* @param exception the MessagingException which could possibly hold the invalid address
* @return if the exception is not an invalid address exception.
*/
public boolean handleEmailException(Throwable exception) {
  String invalidAddress;
  do {
    if (exception instanceof SMTPAddressFailedException) {
      SMTPAddressFailedException smtpAddressFailedException = (SMTPAddressFailedException) exception;
      InternetAddress internetAddress = smtpAddressFailedException.getAddress();
      invalidAddress = internetAddress.getAddress();
    } else if (exception instanceof AddressException) {
      AddressException addressException = (AddressException) exception;
      invalidAddress = addressException.getRef();
    }
    //Here is where I might do a few more else ifs if there are any other applicable exceptions.
    else {
      return false;
    }
    if (invalidAddress != null) {
      //Here's where I do something with the invalid address.
    }
    exception = exception.getCause();
  } while (exception != null);
  return true;
}

---

注意:如果您好奇(或者有帮助)，我使用 Java Helper Library发送电子邮件(请参阅此 line )，这就是最初引发错误的地方。

Answer 1

您通常不需要强制转换异常；这就是为什么你可以有多个 catch block :

try {
    // code that might throw AddressException
} catch (SMTPAddressFailedException ex) {
    // Catch subclass of AddressException  first
    //  ...
} catch (AddressException ex) {
    // ...
}

如果担心嵌套异常，可以使用Guava的Throwables.getRootCause。