Instructions for sending Chinese attachment title garbled in JavaMail

Previously in the CSDN posted a post that may be a bug, would like to directly reply to that post, perhaps due to Csdn's revision? I can't reply to that post now, I can only make a note here.
received a reply from the Sun engineer, gave me a corresponding FAQ link, I am sorry I did not go to the query FAQ:-)
Http://java.sun.com/products/javamail/FAQ.html#encodefilename
The reason is that in the corresponding specification of MIME (RFC2047, etc.), the attachment title must be Us-ascii character, so you need to encode us-ascii characters in the attachment of the Chinese title, there are two ways to encode: B (BASE64), Q (quoted-printable , these methods are already encapsulated in mimeutility, so use the method when sending attachments:
Setfilename (Mimeutility.encodetext (FileName, "GBK"));
But now the mail system is not very consistent here, so there may be a number of individual mail system is garbled, you can choose according to the appropriate encoding method.
As previously mentioned, take iso8859-1 bytes directly: Setfilename (New String (File.getname (). GetBytes (), "iso8859-1"));