JavaMail：内嵌图像生成不正确

Question

我编写了下面的servlet，它以.eml格式（使用JavaMail）生成的电子邮件作为响应。浏览器检测到MIME类型并在收到响应时打开一个电子邮件应用程序（Microsoft Live在我的案例中）。 “X-Unsent”被设置为“1”，所以当电子邮件被打开时，它可以被编辑和发送。

电子邮件内容为带内联图像的HTML。当我打开生成的电子邮件时，我可以看到没有问题的内容。但是，当我输入地址并尝试发送电子邮件时，我收到消息“找不到一个或多个图像，是否要继续？”。无论如何我都会发送它，当我检查电子邮件收件人的帐户时，收到的是电子邮件，而不是将图像内联，而是附上。内嵌图像生成的方式似乎有些不妥。有任何想法吗？

protected void doPost(HttpServletRequest request, HttpServletResponse response) 
     throws ServletException, IOException { 

    response.setContentType("message/rfc822"); 
    response.setHeader("Content-Disposition", "attachment; filename=\"email.eml\""); 

    PrintWriter out = response.getWriter(); 

    String eml = null; 

    try { 

    Message message = new MimeMessage(Session.getInstance(System.getProperties())); 
    message.addHeader("X-Unsent", "1"); 
    message.setSubject("email with inline image"); 

    // This mail has 2 parts, the BODY and the embedded image 
    MimeMultipart multipart = new MimeMultipart("related"); 

    // first part (the html) 
    BodyPart messageBodyPart = new MimeBodyPart(); 
    String htmlText = "<H1>This is the image: </H1><img src=\"cid:image\">"; 
    messageBodyPart.setContent(htmlText, "text/html"); 
    multipart.addBodyPart(messageBodyPart); 

    // second part (the image) 
    messageBodyPart = new MimeBodyPart(); 
    String filePath = "C:/image.png"; 
    DataSource fds = new FileDataSource(filePath); 

    messageBodyPart.setDataHandler(new DataHandler(fds)); 
    messageBodyPart.setHeader("Content-Type", "image/png"); 
    messageBodyPart.setHeader("Content-ID", "image"); 
    messageBodyPart.setDisposition(MimeBodyPart.INLINE); 

    // add image to the multipart 
    multipart.addBodyPart(messageBodyPart); 

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

    ByteArrayOutputStream os = new ByteArrayOutputStream(); 
    message.writeTo(os); 
    eml = new String(os.toByteArray(),"UTF-8"); 
    } 
    catch (MessagingException e) { 
    e.printStackTrace(); 
    } 
    catch (IOException e) { 
    e.printStackTrace(); 
    } 

    out.print(eml); 
    out.flush(); 
    out.close(); 

} 

Answer 1

试试这个简单的版本，也可能解决这个问题：

// first part (the html) 
MimeBodyPart messageBodyPart = new MimeBodyPart(); 
String htmlText = "<H1>This is the image: </H1><img src=\"cid:image\">"; 
messageBodyPart.setText(htmlText, null, "html"); 
multipart.addBodyPart(messageBodyPart); 

// second part (the image) 
messageBodyPart = new MimeBodyPart(); 
String filePath = "C:/image.png"; 
messageBodyPart.attachFile(filePath, "image/png", "base64"); 
messageBodyPart.setContentID("<image>"); 

// add image to the multipart 
multipart.addBodyPart(messageBodyPart);