java mail api发送邮件成功与否

Question

我已经在下面写了一个通过java mail api发送邮件的程序，现在我的查询是为了处理异常情况，也让我说，如果邮件没有发送，那么我必须da一些东西，如果邮件被发送，我必须在cas中做一些其他的事情，现在请告知java mail api在发送邮件时是否证明了任何参数，我们可以检查邮件是否成功发送，因为我已经在我的程序中启用了调试。

emailSession.setDebug(true);

请告知java mail api返回的参数是什么，我们可以通过这个参数来检查邮件是否发送成功。

下面是我的java mail api的简单程序。

public class EmailTest {

    public static void main(String[] args) {

        String mailSmtpHost = "cakelycakes.com";

        String mailTo = "bigcakes@cakelycakes.com";
        String mailCc = "littlecakes@cakelycakes.com";
        String mailFrom = "me@here.there.everywhere";
        String mailSubject = "Email from Java";
        String mailText = "This is an email from Java";

        sendEmail(mailTo, mailCc, mailFrom, mailSubject, mailText, mailSmtpHost);
    }

    public static void sendEmail(String to, String cc, String from, String subject, String text, String smtpHost) {
        try {
            Properties properties = new Properties();
            properties.put("mail.smtp.host", smtpHost);
            Session emailSession = Session.getDefaultInstance(properties);

            Message emailMessage = new MimeMessage(emailSession);
            emailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
            emailMessage.addRecipient(Message.RecipientType.CC, new InternetAddress(cc));
            emailMessage.setFrom(new InternetAddress(from));
            emailMessage.setSubject(subject);
            emailMessage.setText(text);

            emailSession.setDebug(true);

            Transport.send(emailMessage);
        } catch (AddressException e) {
            e.printStackTrace();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }
}

Answer 1

我想你正在寻找这些JavaMail常见问题解答条目：

• If I send a message to a bad address, why don't I get a SendFailedException or TransportEvent indicating that the address is bad?
• When a message can't be delivered, a failure message is returned. How can I detect these "bounced" messages?

Answer 2

嗯，有一种方法可以把所有的电子邮件都发送出去。

对于前-

      //create the POP3 store object and connect with the pop server
  Store store = emailSession.getStore("pop3s");

  store.connect(host, user, password);

  //create the folder object and open it
  Folder emailFolder = store.getFolder("INBOX");
  emailFolder.open(Folder.READ_ONLY);

  // retrieve the messages from the folder in an array and print it
  Message[] messages = emailFolder.getMessages();
  System.out.println("messages.length---" + messages.length);

  for (int i = 0, n = messages.length; i < n; i++) {
     Message message = messages[i];
     System.out.println("---------------------------------");
     System.out.println("Email Number " + (i + 1));
     System.out.println("Subject: " + message.getSubject());
     System.out.println("From: " + message.getFrom()[0]);
     System.out.println("Text: " + message.getContent().toString());

  }

  //close the store and folder objects
  emailFolder.close(false);
  store.close();

  } catch (NoSuchProviderException e) {
     e.printStackTrace();
  } catch (MessagingException e) {
     e.printStackTrace();
  } catch (Exception e) {
     e.printStackTrace();
  }

}

您可以通过比较messag对象的内容来检查邮件是否已发送。

我希望它能对你有所帮助。

Answer 3

我不确定这是不是你需要的。但是您可以像这样检查SMTP服务器的返回码：

// get your configuration (host, port, user, pwd)
...
// initialize your message
...

SMTPTransport transport = (SMTPTransport) session.getTransport("smtp");
transport.connect(host, port, user, pwd);
transport.sendMessage(message, message.getAllRecipients());
// you can get SMTP return code here
int code = transport.getLastReturnCode();