[SHOT]ClassCastException: com.sun.mail.util.BASE64DecoderStream

帮忙查了个Email接收失败的问题，Google和Baidu都没搜到，大概太简单了吧。。。

 

报错情况：java.lang.ClassCastException: com.sun.mail.util.BASE64DecoderStream incompatible with javax.mail.Multipart at ……

 

代码：Multipart mp = (Multipart) mpart.getContent();

 

以上代码是解析邮件附件的标准写法，多数邮件处理也正常，问题邮件在Outlook等客户端里也能正常处理，直接取mail服务器上的备份邮件，发现问题如下：

 

问题邮件： ……

Date: Tue, 24 Mar 2015 11:30:18 GMT From: [e-mail]

To: [e-mail] Cc: [e-mail]

Message-ID:

Subject: BLABLABLALALALA

MIME-Version: 1.0

Content-Type: application/EDIFACT; name=0798114O.96608468.608458886.1

Content-Transfer-Encoding: base64

Content-Disposition: attachment; filename=0798114O.96608468.608458886.1

下面就是base64编码的附件报文

 

正常处理的邮件

……

From: [e-mail]

Date: Mon, 9 Feb 2015 11:01:22 +0800

X-MIMETrack: Serialize by Router on NSHAS01/S/AS_ at 02/09/2015 11:01:23 AM

Content-Type: multipart/mixed; boundary="=_mixed 00109A2B48257DE7_="

……

=

--=_mixed 00109A2B48257DE7_=

Content-Type: application/octet-stream; name="嘻嘻嘻.pdf"

Content-Disposition: attachment; filename="嘻嘻嘻.pdf"

Content-Transfer-Encoding: base64

……

对比发现，问题邮件没有正文，没有boundary设置，MIME 1.0的规范还没仔细研究过。可能也是程序外发的mail，后续对接收程序做改造，增加容错机制【待续】