Question

我正在尝试从邮件消息字符串中获取附件。我假设最好的方法是获取原始字符串，将其转换为javax邮件消息，然后按照this教程。我找不到一种方法来获取原始字符串并转换为javax邮件消息。附件部分的使用时间要长得多，但为了简单起见，我将其缩短了。

示例字符串：

X-DateCreated: 7/11/2014 8:12:53 PM (UTC)
X-Received: Secure delivery via Web Service
Thread-Topic: Test attachment
Date: Fri, 11 Jul 2014 16:12:53 -0400
Message-ID: <218685@CM>
thread-index: Ac+hJI371nbUghSdS9eoy8ESMrck3w==
From: <---->
To: <---->
Subject: Test attachment
MIME-Version: 1.0
Content-Type: multipart/mixed;
    boundary="----=_NextPart_000_55BE_01CFA103.0703D820"
Content-Class: urn:content-classes:message
Importance: normal
Priority: normal
X-MimeOLE: Produced By Microsoft MimeOLE V6.2.9200.16384

This is a multi-part message in MIME format.

------=_NextPart_000_55BE_01CFA103.0703D820
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

Test attachment.
------=_NextPart_000_55BE_01CFA103.0703D820
Content-Type: application/octet-stream;
    name="Copyright.docx"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
    filename="Copyright.docx"
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Mk5nmv0goobuDvfehVvbBUSi//zL6KwHIRJuDKTPJ2h9h+MBkQRjAGydBxGeYHE7GsUr80GQ2nt0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0ep6o7+nxYmFLAmhCYkv+3xmXBJa/ueK5hk/Nu8hWbRf4W8bnF1B8wEAAP//AwBQSwMEFAAGAAgA
AAAhADsvItvGAQAAHgsAABwACAF3b3JkL19yZWxzL2RvY3VtZW50LnhtbC5yZWxzIKIEASigAAEA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAvJXBbtswDIbvBfoOhu6V4rRJtyFOL2uBHnZZU2BX
xWJsL5ZkSMqSvP3YGnG0LRZ2IHrkb5v8/JOUFg8H3Wa/wPnGmoLlfMIyMKVVjakK9rp6uvnEMh+k
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Fy7OwZZ/5MyeVcHcs8L6q2MH/5PbbjZNCV9tudNgwoUSotFYGxNKV0EomAbVyF7MeWcqJi4z5Lcf
AzFPQpA6sbE2gDtT9PGUY6IxAFITfDi2OEpD/T5Olb+nLA9GGfzhCOCkpBDy6cfMwSw5B6RGXJ6D
POUCqQlmp9fg8LQ5IwxSshVzSooapIpd6OO0CxNKgIDfRrPwHvZiEiKnZCh3Plj9A6sNHJyfVdEE
0Eka0pa8DeJfKzpISUtIPRnf0Tv+s4PRJZ1RQuxh/QIh4EZEZkRi0g5SkhozubYx22hV+rT7/Z4r
GaS2b2/z0mpxeuebVVj+8YDnipHjoKT7NN6322Tf8s+0M2zCSq7biGSQUk27I71p/xmdk5JCIPVh
vBvTdDdIjRinuD/dtyKm8MvfAAAA//8DAFBLAwQUAAYACAAAACEAcTmrFcRpAAAnWQQAEQAAAHdv
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OhUBaXjRn1awtDRwz0yyvt7xk0A07eVd8tvfkutb4N89pHwOS2eJQ0jTWZxCcztI1zdfgxQ8HX3F
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Answer 1

好一段时间后，迈克回答我提出了这个解决方案。下面的代码将采用一个字符串，将其转换为javax Message对象，然后解析它以提取各种字段并显示它们。希望这也有助于其他人！

<强> CODE：

try {
    InputStream is = new ByteArrayInputStream(receivedMessage.getBytes(StandardCharsets.UTF_8));
    MimeMessage mime = new MimeMessage(null, is);
    String finalMessage = "From: " + mime.getFrom()[0].toString() + "\n"
    + "To: " + mime.getRecipients(RecipientType.TO)[0] + "\n";
    for (int i = 1; i < mime.getRecipients(RecipientType.TO).length;i++)
        finalMessage = finalMessage + mime.getRecipients(RecipientType.TO)[i] + "\n";
    if (mime.getRecipients(RecipientType.CC) != null && mime.getRecipients(RecipientType.CC).length != 0) {
        finalMessage = finalMessage + "CC: " + mime.getRecipients(RecipientType.CC)[0] + "\n";
        for (int i = 1; i < mime.getRecipients(RecipientType.CC).length;i++)
            finalMessage = finalMessage + mime.getRecipients(RecipientType.CC)[i] + "\n";
    }
    if (mime.getRecipients(RecipientType.BCC)!= null && mime.getRecipients(RecipientType.BCC).length != 0) {
        finalMessage = finalMessage + "BCC: " + mime.getRecipients(RecipientType.BCC)[0] + "\n";
        for (int i = 1; i < mime.getRecipients(RecipientType.BCC).length;i++)
            finalMessage = finalMessage + mime.getRecipients(RecipientType.BCC)[i] + "\n";
    }
    finalMessage = finalMessage + "Subject: " + mime.getSubject() + "\n"
    + "Sent: " + mime.getSentDate() + "\n";
    if (mime.getReceivedDate() != null)
        finalMessage = finalMessage + "Received: " + mime.getReceivedDate() + "\n\n";
    else
        finalMessage = finalMessage + "\n";

    // suppose 'message' is an object of type Message
    String contentType = mime.getContentType();

    if (contentType.contains("multipart")) {
        // this message may contain attachment
        Multipart multiPart = (Multipart) mime.getContent();

        String attachments = "";
        String messageContent = "";

        for (int i = 0; i < multiPart.getCount(); i++) {
            MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(i);
            if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {
                // this part is attachment
                // code to save attachment...
                attachments = attachments + "Attachment: "+part.getFileName()+"\n"; //Turn this into a link the user can click to download
            }
            else {
                messageContent = messageContent + part.getContent().toString() + "\n";
            }
        }
        finalMessage = finalMessage + messageContent + "\n" + attachments;
    }
    message.setText(finalMessage);
} catch (Exception e4) {
    e4.printStackTrace();
}

Answer 2

这里有example从文件读取消息，它可能在设置MimeMessage并从字符串而不是从该示例中的File创建InputStream时很有用。

InputStream stream = new ByteArrayInputStream(mailString.getBytes(StandardCharsets.UTF_8));

OR

您可以创建DataHandler对象。请参阅此SO thread

然后创建一个MimeMessage并使用DataHandler调用它的setContent 方法。

将字符串转换为javax邮件消息对象

2 个答案: