Solution to javamail Email Subject garbled

Many of my friends have used javamail to send emails. garbled characters in the email body are easy to solve. However, no matter how you transcode the subject, a bunch of garbled characters are always displayed. What should I do?
The email subject in javamail must be base64-encoded,

Format:
=? Gb2312? B? Xpq1xmpcwuvs0b6t1tjww6osx + u + OB/stcfcvkossqlq3rjew9zc66oh? =

Therefore, use MSG directly. setsubject ("Chinese topic"), or MSG. setsubject ("Chinese topic ". getbytes ("8859_1"), "gb2312") are both garbled.

Before setting a subject, encode the topic string in base64 format and add an encoding header. The sample code is as follows:

Try {
String subject = "China National helloworld ";
String content = "test the language problem in the email. helloworld ";
Context CTX = new initialcontext ();
If (CTX = NULL)
Throw new exception ("no context ()");
System. Out. println (CTX );

Javax. Mail. Session mailsession = (javax. Mail. Session) CTX. Lookup ("Java: COMP/ENV/mail/session ");
System. Out. println (mailsession );

Message MSG = new mimemessage (mailsession );

Internetaddress [] toaddrs = internetaddress. parse ("david.li@maxcard.com", false );
MSG. setrecipients (message. recipienttype. To, toaddrs );
// Msg. setsubject ("=? Gb2312? B? "+ Base64.encode (subject. getbytes () + "? = ");

// Convert Chinese to gb2312 Encoding
Subject = stringutil. getstring (subject, "gb2312 ");
Subject = new string (base64.encode (subject). getbytes ()));
MSG. setsubject ("=? Gb2312? B? "+ Subject + "? = ");

MSG. setfrom (New internetaddress ("david.li@maxcard.com "));
MSG. settext (stringutil. getstring (content, "gb2312 "));
//
Transport T = mailsession. gettransport ("SMTP ");
T. Send (MSG );
Out. println ("successful ");
// Transport. Send (MSG );
} Catch (exception e ){
Out. println ("failed ");
System. Out. println (E );
}

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