问为什么我的电子邮件方法总是以电子邮件本身作为附件发送电子邮件？

EN

public void sendEmailWithAttachment(EmailProperties properties) {
    MimeMessage message = javaMailSender.createMimeMessage();

    try {
        message.setFrom(properties.getFrom());
        message.setHeader("X-Mailer", properties.getHeader());

        if (properties.getPriority() != null) {
            message.setHeader("X-Priority", properties.getPriority().getValue());
        }

        InternetAddress[] toEmailArray = properties.getToAddresses().toArray(new InternetAddress[properties.getToAddresses().size()]);

        message.setRecipients(javax.mail.Message.RecipientType.TO, toEmailArray);
        message.setSubject(properties.getSubject());
        message.setSentDate(new Date());

        Multipart multipart = new MimeMultipart();
        if (StringUtils.isNotBlank(properties.getMessageText())) {
            MimeBodyPart mimeBodyPart = new MimeBodyPart();
            mimeBodyPart.setText(properties.getMessageText());
            multipart.addBodyPart(mimeBodyPart);
        }

        MimeBodyPart mimeBodyPart = new MimeBodyPart();
        mimeBodyPart.setDataHandler(new DataHandler(new ByteArrayDataSource(properties.getContents(), properties.getContentType())));
        mimeBodyPart.setFileName(properties.getFileName());
        multipart.addBodyPart(mimeBodyPart);

        message.setContent(multipart);

        send(message);
    } catch (Exception exc) {
        logger.error("Error attempting to send email!", exc);
    }
}