图像嵌入在Java邮件中 - CID无法正常工作

Question

图像嵌入在Java邮件中 - CID无法正常工作

我正在开发一个将邮件发送到列表等的应用程序.它是用Java编写的,使用javax.mail api.这里的问题是,我无法使用CID嵌入图像.

这是发送邮件的来源:

Received-SPF: pass (google.com: domain of -@gmail.com designates 209.85.214.43 as permitted sender) client-ip=209.85.214.43;
Date: Tue, 17 Apr 2012 05:07:54 -0700 (PDT)
From: BP MM <-@gmail.com>
To: xx xx <-@gmail.com>
Message-ID: <404745073.01334664469900.JavaMail.xx@Akoya>
Subject: TestImage
MIME-Version: 1.0
Content-Type: multipart/mixed; 
    boundary="----=_Part_2_854532868.1334664469871"

------=_Part_2_854532868.1334664469871
Content-Type: multipart/mixed; 
    boundary="----=_Part_1_1457048287.1334664469871"

------=_Part_1_1457048287.1334664469871
Content-Type: image/png; name=logo.png
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=logo.png
Content-ID: img_cid

[base64 data]
------=_Part_1_1457048287.1334664469871--

------=_Part_2_854532868.1334664469871
Content-Type: multipart/alternative; 
    boundary="----=_Part_0_1033690582.1334664469858"

------=_Part_0_1033690582.1334664469858
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Hello


------=_Part_0_1033690582.1334664469858
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

<html>
<body>
<H1>Hello</H1>
<img src="cid:img_cid">
</body>
</html>

------=_Part_0_1033690582.1334664469858--

------=_Part_2_854532868.1334664469871--

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我尝试了不同的CID,将<和>添加到CID,将内容设置为内联,验证的HTML等.无法使用此功能,Thunderbird和Gmail查看带有"死"图像的邮件.我已经读过客户端在邮件中查找cid,所以我认为应该正确获取图像.发送附件确实有效,但嵌入不起作用.谁有线索？它与Multipart结构有关吗？

用于创建消息的java代码(我已经注释了一些尝试解决它的行...)

    /*
     * The method to create a MimeMessage, this message can be sent with the transport method.
     */
    private Message createMessage(final Mail mail, final Member member, final MailingList list,
            final MailAccount mailAccount, final Session session)
            throws MessagingException, UnsupportedEncodingException {
        // Get attachments
        @SuppressWarnings("unchecked")
        List<File> attachments = (List<File>) mail.getProperty(Mail.ATTACHMENTS_KEY);

        // Create content parts
        String plainContent = templateEngine.replaceTemplateTags(mail, member, list, mailAccount);
        String htmlContent = templateEngine.replaceHTMLTemplateTags(mail, member, list, mailAccount);

        Multipart multiContentPart = new MimeMultipart("alternative");
//      Multipart attachmentsBodyPart = new MimeMultipart();
        Multipart rootBodyPart = new MimeMultipart();

        // Create plain text part
        if (!plainContent.equals("")) {
            BodyPart plainMessageBodyPart = new MimeBodyPart();
            plainMessageBodyPart.setContent(plainContent, "text/plain");
            multiContentPart.addBodyPart(plainMessageBodyPart);
        }

        // Create html part
        if (!htmlContent.equals("")) {
            BodyPart htmlMessageBodyPart = new MimeBodyPart();
            htmlMessageBodyPart.setContent(htmlContent, "text/html");
            multiContentPart.addBodyPart(htmlMessageBodyPart);
        }

        // Create attachments
        if (attachments != null && attachments.size() > 0) {
            for (int i = 0; i < attachments.size(); i++) {
                BodyPart attachmentBodyPart = new MimeBodyPart();
                DataSource source = new FileDataSource(attachments.get(i));
                attachmentBodyPart.setDataHandler(new DataHandler(source));
                attachmentBodyPart.setFileName(attachments.get(i).getName());
                attachmentBodyPart.setHeader("Content-ID", "<img_cid>");
                attachmentBodyPart.setDisposition(Part.INLINE);
//              attachmentsBodyPart.addBodyPart(attachmentBodyPart);
                rootBodyPart.addBodyPart(attachmentBodyPart);
            }
            // Build attachments
//          BodyPart attachmentsWrapper = new MimeBodyPart();
//          attachmentsWrapper.setContent(attachmentsBodyPart);
//          rootBodyPart.addBodyPart(attachmentsWrapper);
        }

        // Build content
        BodyPart contentWrapper = new MimeBodyPart();
        contentWrapper.setContent(multiContentPart);
        rootBodyPart.addBodyPart(contentWrapper);

        // Create message
        Message message = new MimeMessage(session);
        message.setRecipient(Message.RecipientType.TO, new InternetAddress(
                member.getEmail(), member.getName()));
        message.setSubject((String) mail.getProperty(Mail.SUBJECT_KEY));
        message.setContent(rootBodyPart);

        // Add headers
        message.setFrom(new InternetAddress(mailAccount.getFromAddress(),
                mailAccount.getFromName()));
        if (mailAccount.getReplyTo() != "" && mailAccount.getReplyTo() != null)
            message.setReplyTo(InternetAddress.parse(mailAccount.getReplyTo()));

        return message;
    }

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不要介意每个附件的CID是相同的,稍后这将是文件名 - 我现在只测试一个附件.希望这可以帮助..

Answer 1

kro*_*ens 4

我发现邮件来源没有任何问题。这是邮件客户端处理 CID 的方式。Gmail.com 要求 CID 设置在 < 和 > 之间。Thunderbird 还没有显示我的图像.. 我认为它需要某种独特的.. 仍然不知道为什么以及如何解决它。通过Embedding images into html email with java mail找到它

组合身体部位的一个非常好的来源http://blogs.technet.com/b/exchange/archive/2011/04/21/mixed-ing-it-up-multipart-mixed-messages-and-you.aspx (2认同)
要使其在 Thunderbird 中工作，请删除此行：attachmentBodyPart.setHeader("Content-ID", "<img_cid>"); 并添加这两行：attachmentBodyPart.addHeader("Content-ID", "<img_cid>"); AttachmentBodyPart.addHeader("Content-Type", "image/png"); 假设您的 HTML 正文中有以下内容： <img src=\"cid:img_cid\"> (2认同)

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