使用 Java 提取内联电子邮件附件

debugcn 发表于 Dev

阿克谢·洛库尔

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;
 }

但是，我总是得到bodyPart.getDisposition(): null. 任何线索我应该如何提取内联附件？

谢谢

PS：我Apple Mail在 Mac 上使用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被关注。

阿克谢·洛库尔

我明白了，确实我必须进行一些“递归”并检查嵌套内容并检查Part.INLINE.equalsIgnoreCase(bodyPart.getDisposition().

以下是代码，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;
    }

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