java - .zip 文件在 java 中发送电子邮件时被转换为 .bin 文件

Question

我正在尝试使用以下带有zip file附件的片段发送邮件，我可以发送电子邮件，但作为 zip 文件的附件被转换为某个.bin文件。我需要设置一些属性吗？为什么 zip 文件被转换为 .bin 文件？

Properties props = new Properties();
            props.setProperty("mail.transport.protocol", "smtp");
            props.setProperty("mail.host", "smtp.gmail.com");

            Session mailSession = Session.getDefaultInstance(props, null);
            mailSession.setDebug(true);
            Transport transport = mailSession.getTransport();

            MimeMessage message = new MimeMessage(mailSession);
            message.setSubject("HTML  mail with images");
            message.setFrom(new InternetAddress("b@gmail.com"));
            message.addRecipient(Message.RecipientType.TO,
                 new InternetAddress("a@gmail.com"));
            MimeMultipart multipart = new MimeMultipart("related");

            // first part  (the html)
            BodyPart messageBodyPart = new MimeBodyPart();
            String htmlText = "PFA Query Output.";
            messageBodyPart.setContent(htmlText, "text/html");

            // add it
            multipart.addBodyPart(messageBodyPart);

            // second part (the image)
            messageBodyPart = new MimeBodyPart();
            DataSource fds = new FileDataSource(zipFilePath);
            messageBodyPart.setDataHandler(new DataHandler(fds));
            messageBodyPart.setHeader("Content-ID","<image>");

            // add it
            multipart.addBodyPart(messageBodyPart);

            // put everything together
            message.setContent(multipart);

            transport.connect();
            transport.sendMessage(message,
                message.getRecipients(Message.RecipientType.TO));
            transport.close();

Answer 1

messageBodyPart.setHeader("Content-ID","<image>")如果您不发送图像，请删除。

添加以下语句设置附件文件名，

  messageBodyPart.setFileName(zipFilePath);

Answer 2

代替

 DataSource fds = new FileDataSource(zipFilePath);

尝试

 DataSource fds = new FileDataSource(new File(zipFilePath));

也尝试删除，

 messageBodyPart.setHeader("Content-ID","<image>");