将字符串转换为javax邮件消息对象

我试图从邮件消息字符串中获取附件。我假设这样做的最好方法是取原始字符串，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将其转换为javax邮件消息。附件部分时间更长，但为了简单起见，我将其缩短。将字符串转换为javax邮件消息对象

样品字符串：

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: <[email protected]> 
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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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 
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来源

2014-07-16 Kyle

这里有一个example从文件中读取消息时，它可能是在建立的MimeMessage有用的，从字符串，而不是从该示例中的文件创建一个InputStream。

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

您可能能够创建一个DataHandler对象见本SO thread

，然后创建一个MimeMessage，并调用它的setContent方法用的DataHandler。

来源

2014-07-16 19:41:45 Mike

好了一段时间后，迈克的答案我已经想出了这个解决方案。下面的代码将采用一个字符串，将其转换为一个javax消息对象，然后解析它以提取各个字段并显示它们。希望这可以帮助别人！

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(); 
}

来源

2014-07-16 20:44:49 Kyle

将字符串转换为javax邮件消息对象

回答

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