如何从JavaMailSender异常中检索附件名称？

Question

mailSender.send(mimeMessagePreparators);

        MimeMessagePreparator mimeMessagePreparator = new MimeMessagePreparator() {
            public void prepare(MimeMessage mimeMessage) throws MessagingException {

                MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);

                // get the subscribers of the attachment and put them as the recipients
                // of this email
                mimeMessageHelper.setTo(subscribers);

                // all email have the same from, bcc, reply to, subject, and body
                String fromEmailAddress = emailTemplate.getFromEmailAddress();
                mimeMessageHelper.setFrom(fromEmailAddress);

                // note: bcc the sender so that they get the email too
                mimeMessageHelper.setBcc(fromEmailAddress);

                // this will help on auto replies and bounce messages
                // also it should help on deliverability
                mimeMessageHelper.setReplyTo(fromEmailAddress);

                String subject = emailTemplate.getSubject();
                mimeMessageHelper.setSubject(subject);

                String emailBody = emailTemplate.getBody();
                mimeMessageHelper.setText(OPEN_EMAIL_TAGS + emailBody + CLOSE_EMAIL_TAGS, true);

                // get the physical file and add as an email attachment
                FileSystemResource file = new FileSystemResource(new File(directory, attachment.getName()));
                mimeMessageHelper.addAttachment(attachment.getName(), file);

            }
        };

我需要知道哪些电子邮件失败（即有一个MailException）并最终告诉用户与失败的电子邮件相关联的附件的名称。如何从异常中检索附件名称？到目前为止，我已经

try {
        mailSender.send(mimeMessagePreparators);
} catch (MailSendException mailSendException) {

        Map<Object, Exception> map = mailSendException.getFailedMessages();

        for (Map.Entry<Object, Exception> entry : map.entrySet()) {
            MimeMessage mimeMessage = (MimeMessage) entry.getKey();
            // get attachment names from mimeMessage? or preferably
            // get in a more simplistic way using a helper such as MimeMessageHelper
} catch (MailException mailException) {
    // how do I get attachment names here?
}

Answer 1

如果您有一堆MimeMessage对象，请参阅从下面开始的JavaMail FAQ条目：

• 如何判断邮件是否包含附件？

本质上，您需要迭代消息中的部分，确定哪些部分代表附件，然后访问您认为代表附件“名称”的部分中的任何元数据或头。