可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试):
问题:
I'm using Java Mail API and I'm trying to send an email through Gmail's SMTP.
How my program works:
java.util.Scanner class is used to get user input - I'm asking user for various parameters to be used in mail sending class; which does the following:
Message mailMessage = new MimeMessage(session);
mailMessage.setFrom(new InternetAddress("example@example.com"));
mailMessage.setRecipients(Message.RecipientType.TO,InternetAddress.parse(mail.getTo()));
mailMessage.setSubject(mail.getSubject());
mailMessage.setText(mail.getMessage());
Transport.send(mailMessage);
Everything works as long as I use ASCII symbols/ chars. But whenever I want to use "country-specific" characters - like [õäöü] - I get bunch of weird-looking symbols...
Techniques I've used so far(which don't work for me):
setHeader("Content-Type", "text/plain; charset=UTF-8");
setHeader("Content-Encoding","ISO-8859-9");
setContent(message, "text/plain; charset=iso-8859-2");
Note: everything is displayed correctly inside an IDE when System.out.println() is performed to display the message to be sent.
EDIT: e.x. when sent message body is [õäöü]
It's displayed [ä„”?] in Gmail.
EDIT: When mailMessage.setText(MimeUtility.encodeText(mail.getMessage(), "UTF-8", "Q"));
is used, then the output in Gmail is following:
"=?UTF-8?Q?=C3=A4=E2=80=9E=E2=80=9D=EF=BF=BD;=0D=0A?="
ANOTHER EDIT: Interestingly, when I do: mailMessage.setText(strVar + "õäöü", "ISO-8859-1");
It actually appends "õäöü" nicely in my email (but the first part[strVar] of the string is still full of ?'s and []'s).
回答1:
MimeMessage message = new MimeMessage(session);
message.setSubject(subject, "UTF-8");
message.setText(body, "UTF-8");
So one has to set the character encoding for both, body and subject.
Addendum because of comment of @bartac
For the corresponding MimeBodyPart
do a setHeader("Content-Type", "text/plain; charset=UTF-8")
.
回答2:
You should use setText(String text, String charset)
or setText(String text, String charset, String subtype)
to set the text body with a specific encoding.
MimeUtility.encodeText()
is not meant for body text, but only for encoded text in headers (and then only for headers set with setHeader
or addHeader
).
回答3:
Basically, my code works just fine, as its supposed to. It was the cmd, that could not handle non-ascii letters. I used a bat file to access a jar. I think I'm just going to make a little GUI then... Thanks everyone for answering.
回答4:
The following worked for me:
MimeMessage message = ...
message.setSubject(subject, "UTF-8");
message.setContent(body, "text/plain; charset=UTF-8");
Where subject
and body
are regular String objects with no special treatment (code and user interface use UTF-8).
回答5:
1- Consider you want to send an email with this string in the body:
"Olá João!"
2 - As the code is running in the GAE server, this string is interpreted with the default ASCII encoding. To send this email with the correct accented characters, define the String as:
String body = "Ol\u00e1 Jo\u00e3o!";
The special characters are manually defined with its UTF-8 codes. Search the codes you need in the table http://www.utf8-chartable.de/
3- Convert the string encoding to UTF-8. All the codes manually typed will be now correctly interpreted:
Session session = Session.getDefaultInstance(props);
MimeMessage message = new MimeMessage(session);
String encodedSubject = new String (subject.getBytes("UTF-8"),"UTF-8");
String encodedBody = new String (body.getBytes("UTF-8"),"UTF-8");
message.setSubject(encodedSubject, "UTF-8");
message.setText(encodedBody, "UTF-8");
回答6:
Use the encodeText method from MimeUtility:
MimeUtility.encodeText(mail_subject, "UTF-8", "B")
(I don't know what "B" means, keep calm, and just use. Actually it can be "B" or "Q".)
回答7:
JavaMailSenderImpl emailSender = new JavaMailSenderImpl();
mailSender.setHost("...");
MimeMessage message = emailSender.createMimeMessage();
message.setSubject("...", "UTF-8");
message.setText("...", "UTF-8");
MimeMessageHelper helper = new MimeMessageHelper(message, "UTF-8");
helper.setFrom(from);
helper.setTo(to);
emailSender.send(message);
回答8:
In case if you use HTML messages, try this:
Message message = new MimeMessage(session);
message.setContent(htmlText, "text/html; charset=UTF-8");