我的目标：通过 SMTP 发送带有纯文本、文本/html 和附件的交易电子邮件。
我的代码：用 JavaMail 实现
我的问题：在 hotmail 或 Outlook 上看起来不错。但是在gmail上，如果它是带有 .txt 附件的电子邮件，它不会正确显示消息正文（如果附件是图像，它可以正常工作）
任何帮助将不胜感激。
这是我的原始 SMTP 输出：
Subject: ALTERNATIVE | TXT | HTML |ATT.ATTACHMENT | Thu Jun 13 17:48:04 EDT
2013
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_Part_0_21791733.1371160084561"
------=_Part_0_21791733.1371160084561
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Body message in text format!
------=_Part_0_21791733.1371160084561
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit
Body message in <b>html</b> format! Sent on Thu Jun 13 17:48:04 EDT 2013<br> to: me@gmail.com<br> to: me@mijo.com<br> cc: me@hotmail.com<br> cc: rafael.santos.test@hotmail.com
------=_Part_0_21791733.1371160084561
Content-Type: text/plain; charset=us-ascii; name=email_attachment.txt
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename=email_attachment.txt
This is a text attachment file!
------=_Part_0_21791733.1371160084561--
.
250 Delivery in progress
QUIT
一些截图
仅发送一个 .txt 附件。邮件正文不显示，附件重复。
相同的消息，但带有不同的附件 (.gif)。一切看起来都很好。
=== 面向 JAVA 开发人员的解决方案 ====
这里描述了总体思路：http: //www.coderanch.com/t/503380/java/java/Java-Mail-text-html-attachment
所以，现在我的代码看起来像：
// contentPart is the content to be sent. It is divided in bodyContent and attachmentContent
MimeMultipart contentPart = new MimeMultipart("mixed");
// Message body in txt and html format
MimeMultipart bodyPart = new MimeMultipart("alternative");
// Creates plain text message
BodyPart bodyTxt = new MimeBodyPart();
bodyTxt.setText(getMessageBodyText());
// Creates html message
BodyPart bodyHtml = new MimeBodyPart();
bodyHtml.setContent(getMessageBodyHtml(), "text/html");
bodyPart.addBodyPart(bodyTxt);
bodyPart.addBodyPart(bodyHtml);
// Wrapper for bodyTxt and bodyHtml
MimeBodyPart bodyContent = new MimeBodyPart();
bodyContent.setContent(bodyPart);
// At this point, contentPart contains bodyTxt and bodyHtml wrapped in a multipart/alternative
contentPart.addBodyPart(bodyContent);
// Adds attachments to contentPart
if (getAttachments() != null) {
for(File f : getAttachments()) {
try {
MimeBodyPart attachmentPart = new MimeBodyPart();
attachmentPart.attachFile(f);
contentPart.addBodyPart(attachmentPart);
} catch (IOException e) {
logger.severe("Could not attach file to email!" +
" TO: "+ getTo().toString() +
"; CC: "+ getCc().toString() +
"; ExceptionMessage: " + e.getMessage());
throw new SmtpRequestException(e.getMessage());
}
}
}