无法解析Mime消息

Question

我有以下mime消息:

Return-Path: <[e-mail]>
X-Original-To: [e-mail]
Delivered-To: [e-mail]
Received: from localhost [127.0.0.1]
    by unify-prod with POP3 (fetchmail-6.3.21)
    for <other@localhost> (single-drop); Mon, 03 Aug 2015 12:42:24+0000 (UTC)
Received: from testdomain.com (testdomain.com [192.69.176.183])
    by unify.test.com (Postfix) with ESMTPS id AA3874330B
    for <[e-mail]>; Mon,  3 Aug 2015 12:42:23 +0000 (UTC)
 Received: from test.call (test.call [10.3.1.49])
    by test.com (Postfix) with ESMTP id 56EC73BA8C4
    for <[e-mail]>; Mon,  3 Aug 2015 12:42:23 +0000 (UTC)
Date: Mon, 3 Aug 2015 12:42:23 +0000 (UTC)
From: [e-mail]
To: [e-mail]
Message-ID: <385098705.398991.1438605743348.JavaMail.sd@sdapp04>
Subject: Update
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

|0004625641|
|630805367|
|NA14220388|
|03.08.2015 14:42:23|

||

我想用下面的代码解析grails中的消息:

InputStream mailFileInputStream = new FileInputStream("/home/peter/test.msg");
    Properties props = new Properties();
    Session session = Session.getDefaultInstance(props, null);
    MimeMessage message = new MimeMessage(session, mailFileInputStream);
    MimeMessageParser parser = new MimeMessageParser(message)
    parser.parse()

    def data = [:]
    data.from = parser.getFrom()
    data.to = parser.getTo()
    data.replyTo = parser.getReplyTo()
    data.html = parser.getHtmlContent()
    data.plain = parser.getPlainContent()
    data.subject = parser.getSubject()
    data.attachments = parser.getAttachmentList()

但是消息没有被正确解析。整个信息都在简单的内容中。这条信息有什么问题?

最诚挚的问候,彼得。

Answer 1

当我试图解析消息时，我得到了这个异常:

java.lang.ClassCastException: javax.mail.util.SharedByteArrayInputStream cannot be cast to java.lang.String
    at org.apache.commons.mail.util.MimeMessageParser.parse(MimeMessageParser.java:181)
    at org.apache.commons.mail.util.MimeMessageParser.parse(MimeMessageParser.java:96)
    at org.apache.commons.mail.util.MimeMessageParser$parse.call(Unknown Source)

问题是MimeMessageParser试图将Object强制转换为String。您可以在源代码第181行看到这一点。该对象是javax.mail.util的实例。SharedByteArrayInputStream，它不会通过强制转换返回内容。我的示例使用StringBufferInputStream作为输入，因此这可能在问题中起作用。 <标题> 工作

为了解决这个问题，我重写了MimeMessage.getContent()，以便它返回纯文本内容。显然，不要对非纯文本内容这样做。下面是完整的脚本:

@Grab('org.apache.commons:commons-email:1.4')
import javax.mail.Session
import javax.mail.internet.MimeMessage
import org.apache.commons.mail.util.MimeMessageParser
def input = '''Return-Path: <[e-mail]>
X-Original-To: [e-mail]
Delivered-To: [e-mail]
Received: from localhost [127.0.0.1]
    by unify-prod with POP3 (fetchmail-6.3.21)
    for <other@localhost> (single-drop); Mon, 03 Aug 2015 12:42:24+0000 (UTC)
Received: from testdomain.com (testdomain.com [192.69.176.183])
    by unify.test.com (Postfix) with ESMTPS id AA3874330B
    for <[e-mail]>; Mon,  3 Aug 2015 12:42:23 +0000 (UTC)
 Received: from test.call (test.call [10.3.1.49])
    by test.com (Postfix) with ESMTP id 56EC73BA8C4
    for <[e-mail]>; Mon,  3 Aug 2015 12:42:23 +0000 (UTC)
Date: Mon, 3 Aug 2015 12:42:23 +0000 (UTC)
From: [e-mail]
To: [e-mail]
Message-ID: <385098705.398991.1438605743348.JavaMail.sd@sdapp04>
Subject: Update
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

|0004625641|
|630805367|
|NA14220388|
|03.08.2015 14:42:23|

||'''
// Creates a MimeMessage that makes MimeMessageParser happy.
MimeMessage createMimeMessage(InputStream stream) {
    def getContent = MimeMessage.metaClass.getMetaMethod('getContent')
    def message = new MimeMessage(
        Session.getDefaultInstance(new Properties()), 
        stream)
    /*
     * Override MimeMessage.getContent()
     * to coerce SharedByteArrayInputStream
     * into a String. Groovy does it automatically :)
     */
    message.metaClass.getContent = {
        getContent.invoke(delegate)
    }
    return message
}
def message = createMimeMessage(new StringBufferInputStream(input))
def parser = new MimeMessageParser(message)
parser.parse()
def data = parser.with {
    [
        from: from,
        to: to,
        replyTo: replyTo,
        html: htmlContent,
        plain: plainContent,
        subject: subject,
        attachments: attachmentList,
    ]
}
assert data.from == '[e-mail]'
assert data.to instanceof List
assert data.replyTo == '[e-mail]'
assert data.html == null
assert data.attachments == []
assert data.plain instanceof String

数据Map包含以下内容:

[from:[e-mail], to:[[e-mail]], replyTo:[e-mail], html:null, plain:
|0004625641|
|630805367|
|NA14220388|
|03.08.2015 14:42:23|

||, subject:Update, attachments:[]]

Answer 2

from java mail api:

import javax.mail.internet.*;
import javax.mail.*;
def message = '''Return-Path: <[e-mail]>
X-Original-To: [e-mail]
Delivered-To: [e-mail]
Received: from localhost [127.0.0.1]
    by unify-prod with POP3 (fetchmail-6.3.21)
    for <other@localhost> (single-drop); Mon, 03 Aug 2015 12:42:24+0000 (UTC)
Received: from testdomain.com (testdomain.com [192.69.176.183])
    by unify.test.com (Postfix) with ESMTPS id AA3874330B
    for <[e-mail]>; Mon,  3 Aug 2015 12:42:23 +0000 (UTC)
 Received: from test.call (test.call [10.3.1.49])
    by test.com (Postfix) with ESMTP id 56EC73BA8C4
    for <[e-mail]>; Mon,  3 Aug 2015 12:42:23 +0000 (UTC)
Date: Mon, 3 Aug 2015 12:42:23 +0000 (UTC)
From: [e-mail]
To: [e-mail]
Message-ID: <385098705.398991.1438605743348.JavaMail.sd@sdapp04>
Subject: Update
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

|0004625641|
|630805367|
|NA14220388|
|03.08.2015 14:42:23|

||'''
InputStream mailFileInputStream = new FileInputStream(message);    
Properties props = new Properties();     
Session session = Session.getDefaultInstance(props, null);    
MimeMessage message1 = new MimeMessage(session, mailFileInputStream);     
message1.getFrom()println "-----data--${message1.getRecipients()}----${message1.getAllHeaders()}"​​​​​​​​​​​

这一定是给

java.security.AccessControlException: access denied ("java.io.FilePermission" 

可以通过以下方式解决:java.security.AccessControlException: Access denied (java.io.FilePermission