如何使用JavaMailSenderImpl发送UTF-8编码的电子邮件正文？

Question

我这样发送电子邮件:

@Test
public void testEmailCharacterSet() throws MessagingException, UnsupportedEncodingException {
    JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
    mailSender.setDefaultEncoding("utf-8");
    mailSender.setHost("*****");
    mailSender.setUsername("*****");
    mailSender.setPassword("*****");

    Properties properties = new Properties();
    properties.setProperty("mail.mime.charset", "utf-8");

    mailSender.setJavaMailProperties(properties);

    MimeMessage mimeMessage = mailSender.createMimeMessage();
    MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, false, "utf-8");
    mimeMessage.setContent("Árvízt?r? tükörfúrógép 3", "text/html"); 
    helper.setFrom("noreply@foobar.com");
    helper.setTo("foobar@gmail.com");

    mailSender.send(mimeMessage);
}

正如你所看到的,我在任何地方设置utf-8.我的问题是传出的原始字节仍然是Latin1,至少这是我在Wireshark中看到的:

Date: Sun, 17 May 2015 18:16:21 +0200 (CEST)
From: noreply@foobar.com
To: foobar@gmail.com
Message-ID: <13648335.0.1431879381653.JavaMail.foo@foo-dell>
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

=C1rv=EDzt?r? t=FCk=F6rf=FAr=F3g=E9p 3
.

所以基本上标题都是UTF-8,但是输出字节已经包含问号,其中ő和ű应该出现,这是Latin1中缺少的两个字符.JVM file.encoding不是UTF-8,但我正在寻找一种方法来保持原样,并仅在电子邮件方面解决这个问题.

谢谢!

更新

我之前已成功使用普通的旧方法发送电子邮件,有趣的是,它仍然有效:

Message mimeMessage = new MimeMessage(session);
mimeMessage.setContent("Árvízt?r? tükörfúrógép 7 oldschool", "text/html; charset=utf-8"); 

所以它显然是JavaMailSenderImpl唯一的特定的东西.

Answer 1

如果添加以下行：

properties.setProperty("mail.smtp.allow8bitmime", "true");
properties.setProperty("mail.smtps.allow8bitmime", "true");

对于您的代码，消息的Content-Transfer-Encoding:标头将设置为8 位，并且邮件将可读。

Answer 2

这对我有用 -链接

mailSender.send(new MimeMessagePreparator() {
   public void prepare(MimeMessage mimeMessage) throws MessagingException {
     MimeMessageHelper message = new MimeMessageHelper(mimeMessage, true, "UTF-8");
     message.setFrom("me@mail.com");
     message.setTo("you@mail.com");
     message.setSubject("my subject");
     message.setText("my text <img src='cid:myLogo'>", true);
     message.addInline("myLogo", new ClassPathResource("img/mylogo.gif"));
     message.addAttachment("myDocument.pdf", new ClassPathResource("doc/myDocument.pdf"));
   }
 });