如何包含 £ java邮件中电子邮件主题行中的井号符号

Question

如何在通过 java 邮件发送的电子邮件的主题行中包含井号？

我发送的时候显示不正确。

Answer 1

主题是标题。标头仅使用 ascii-7，因此要正确编码非 ascii-7 字符，您应该使用正确的编码。

如果您使用的类允许您指定某种编码，请尝试使用 UTF-8。

mimeMessage.setSubject(yourSubject, "UTF-8");

如果您手动编写标题，请使用以下任何一个：

MimeUtility.encodeWord(yourSubject, "UTF-8", "B"); // base-64
MimeUtility.encodeWord(yourSubject, "UTF-8", "Q"); // quoted-printable

这或多或少是 MimeMessage 在 setSubject(str,encoding) 中所做的事情：

setHeader("Subject", MimeUtility.fold(9, MimeUtility.encodeText(subject, charset, null)));
// fold splits the value in several lines with no more than 72 chars

Sample

我已经尝试过这个：

public static void main(String[] args) throws Exception {
            // manual encoding
        System.out.println(MimeUtility.encodeText("How to include £ pound symbol", "UTF-8", "Q"));
        System.out.println(MimeUtility.encodeText("How to include £ pound symbol", "UTF-8", "B"));

            // MimeMessage encoding
        MimeMessage m = new MimeMessage((Session) null);
        m.setSubject("How to include £ pound symbol", "UTF-8");
        m.setContent("lalala", "text/plain");
        m.writeTo(System.out);
    }

并且输出是：

=?UTF-8?Q?How_to_include_=C2=A3_pound_symbol?=
=?UTF-8?B?SG93IHRvIGluY2x1ZGUgwqMgcG91bmQgc3ltYm9s?=

(. ..）

Message-ID: <21944831.01314352473121.JavaMail.HAC001ES@SE115179>
Subject: =?UTF-8?Q?How_to_include_=C2=A3_pound_symbol?=
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

lalala

无论如何你总是可以使用：

String yourEncodedString = MimeUtility.encodeText(str, "UTF-8", "Q");
mimeMessage.setHeader("Subject", yourEncodedString);

Answer 2

将编码设置为 UTF-8..

msg.setContent(message,"text/html; charset=UTF-8");