Javamail改变主题行的字符集 [英] Javamail changing charset of subject line

问题描述

我使用Javamail（javax.mail）发送邮件。我成功地调整我的邮件内容为utf-8。但我无法将主题行设置为utf-8编码的字符串。

I am using Javamail (javax.mail) to send mails. I successfully adjusted contents of my mail as utf-8. However I could not set subject line as a utf-8 encoded string.

我尝试了

mail.setSubject(new String(subject.getBytes("utf-8"), "utf-8"));

，但它仍然作为Cp1252发送。来自邮件的示例标题如下：

on subject however it still sends as Cp1252. Example headers from mail are given below:

任何想法？

推荐答案

=http://java.sun.com/products/javamail/javadocs/javax/mail/internet/MimeMessage.html#setSubject%28java.lang.String,%20java.lang.String%29 =nofollow noreferrer > setSubject（String subject，String charset），这是一个方便的功能。

You should use setSubject(String subject, String charset) which is a convenient function for this purpose.

Session session=Session.getDefaultInstance(new Properties());
MimeMessage mimeMsg= new MimeMessage(session);
String subject="Herr Müller reist nach \u0141\u00f3d\u017a.";
mimeMsg.setSubject(subject,"utf-8");
System.out.println(subject);
System.out.println(mimeMsg.getHeader("Subject")[0]);

在 MimeUtility 它说：

是一组根据RFC 2047编码和解码MIME头的方法。注意，一般来说，当使用setSubject和setRecipients等方法时，不需要这些方法;当使用这些更高级别方法时，JavaMail将自动编码和解码数据。以下方法仅在使用setHeader和getHeader方法来处理原始MIME标题时才需要。

There are a set of methods to encode and decode MIME headers as per RFC 2047. Note that, in general, these methods are not needed when using methods such as setSubject and setRecipients; JavaMail will automatically encode and decode data when using these "higher level" methods. The methods below are only needed when maniuplating raw MIME headers using setHeader and getHeader methods.

从我的角度来看， Message.setSubject 应该是此目的的入口点。

From my point of view, Message.setSubject should be the entry point for this purpose.

主题编码中的 cp1252 显示出来，因为它是您平台上的标准编码。

The cp1252 in your subject encoding shows up, because it is your standard encoding on your platform.

您发布的示例是

mail.setSubject(MimeUtility.encodeText(subject, "cp1252", "Q"));`

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