用Java提取内联电子邮件附件

我正在使用以下

Java

代码尝试提取电子邮件附件：

private static List<File> extractAttachment(Message message) {
    List<File> attachments = new ArrayList<File>();
    try {
        Multipart multipart = (Multipart) message.getContent();

        for (int i = 0; i < multipart.getCount(); i++) {
        BodyPart bodyPart = multipart.getBodyPart(i);
        System.out.println("bodyPart.getDisposition(): " + bodyPart.getDisposition());
        if (!Part.ATTACHMENT.equalsIgnoreCase(bodyPart.getDisposition())) {
            continue; // dealing with attachments only
        }
        InputStream is = bodyPart.getInputStream();
        String filePath = "/tmp/" + bodyPart.getFileName();
        System.out.println("Saving: " + filePath);
        File f = new File(filePath);
        FileOutputStream fos = new FileOutputStream(f);
        byte[] buf = new byte[4096];
        int bytesRead;
        while ((bytesRead = is.read(buf)) != -1) {
            fos.write(buf, 0, bytesRead);
        }
        fos.close();
        attachments.add(f);
        }
    } catch (IOException | MessagingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return attachments;
 }

私有静态列表提取附件（消息）{
列表附件=新的ArrayList（）；
试一试{
Multipart Multipart=（Multipart）message.getContent（）；
对于（int i=0；i

但是，我总是得到

bodyPart.getDisposition（）：null

。我该如何提取内联附件

谢谢

---

注意：我正在使用Mac电脑上的

Apple Mail

客户端发送带有附件的测试电子邮件。然而，电子邮件客户端不应该引起关注。

我得到了它，事实上，我必须进行一些“递归”，检查嵌套内容并检查

Part.INLINE.equalsIgnoreCase（bodyPart.getDisposition（）

）

下面是代码，认为对某人有用：

private static List<File> extractAttachment(Multipart multipart) {
    List<File> attachments = new ArrayList<File>();
    try {

        for (int i = 0; i < multipart.getCount(); i++) {
        BodyPart bodyPart = multipart.getBodyPart(i);

        if (bodyPart.getContent() instanceof Multipart) {
            // part-within-a-part, do some recursion...
            extractAttachment((Multipart) bodyPart.getContent());
        }

        System.out.println("bodyPart.getDisposition(): " + bodyPart.getDisposition());
        if (!Part.INLINE.equalsIgnoreCase(bodyPart.getDisposition())) {
            continue; // dealing with attachments only
        }

        InputStream is = bodyPart.getInputStream();
        String filePath = "/tmp/" + bodyPart.getFileName();
        System.out.println("Saving: " + filePath);
        File f = new File(filePath);
        FileOutputStream fos = new FileOutputStream(f);
        byte[] buf = new byte[4096];
        int bytesRead;
        while ((bytesRead = is.read(buf)) != -1) {
            fos.write(buf, 0, bytesRead);
        }
        fos.close();
        attachments.add(f);
        }
    } catch (IOException | MessagingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return attachments;
    }

私有静态列表提取附件（多部分多部分）{
列表附件=新的ArrayList（）；
试一试{
对于（int i=0；i

我明白了，实际上我必须执行一些“递归”，检查嵌套内容并检查

Part.INLINE.equalsIgnoreCase（bodyPart.getDisposition（）

）

下面是代码，认为对某人有用：

private static List<File> extractAttachment(Multipart multipart) {
    List<File> attachments = new ArrayList<File>();
    try {

        for (int i = 0; i < multipart.getCount(); i++) {
        BodyPart bodyPart = multipart.getBodyPart(i);

        if (bodyPart.getContent() instanceof Multipart) {
            // part-within-a-part, do some recursion...
            extractAttachment((Multipart) bodyPart.getContent());
        }

        System.out.println("bodyPart.getDisposition(): " + bodyPart.getDisposition());
        if (!Part.INLINE.equalsIgnoreCase(bodyPart.getDisposition())) {
            continue; // dealing with attachments only
        }

        InputStream is = bodyPart.getInputStream();
        String filePath = "/tmp/" + bodyPart.getFileName();
        System.out.println("Saving: " + filePath);
        File f = new File(filePath);
        FileOutputStream fos = new FileOutputStream(f);
        byte[] buf = new byte[4096];
        int bytesRead;
        while ((bytesRead = is.read(buf)) != -1) {
            fos.write(buf, 0, bytesRead);
        }
        fos.close();
        attachments.add(f);
        }
    } catch (IOException | MessagingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return attachments;
    }

私有静态列表提取附件（多部分多部分）{
列表附件=新的ArrayList（）；
试一试{
对于（int i=0；i

当从没有正文内容但带有附件的mac发送邮件时，我也遇到了类似的问题。当迭代初始邮件内容时，附件没有显示出来，并且必须递归查找

我把对我有用的东西贴在下面

private Map<String, String> extractAttachments(Multipart multiPart, Map<String, String> attachmentAndName) {
    try {
        for (int i = 0; i < multiPart.getCount(); i++) {
            BodyPart part = multiPart.getBodyPart(i);
            if (part.getContent() instanceof Multipart) {
                attachmentAndName = extractAttachments((Multipart) part.getContent(), attachmentAndName);
            } else if (part instanceof MimeBodyPart) {
                MimeBodyPart mimeBodyPart = (MimeBodyPart) part;
                String fileName = createUniqueFileName(mimeBodyPart.getFileName());
                if (Part.ATTACHMENT.equalsIgnoreCase(mimeBodyPart.getDisposition())) {
                    String attachmentAsString = IOUtils.toString(mimeBodyPart.getInputStream(), StandardCharsets.UTF_8);
                    attachmentAndName.put(fileName, attachmentAsString);
                    if (SAVE_ATTACHMENTS_LOCALLY) {
                        saveFile(mimeBodyPart, fileName);
                    }
                }
            }
        }
    } catch (IOException | MessagingException e) {
        logger.error("Failed to process attachment. Continuing to process other message parts in search of attachments...");
    }
    return attachmentAndName;
}

私有映射提取附件（多部分、多部分、映射附件和名称）{
试一试{
对于（int i=0；i