附件的名称编码失败 [英] Attachement's name encoding fails
问题描述
我尝试发送带有附件的电子邮件(一个pdf文件)，但是接收者收到的文件名称却不同，并且.pdf结尾没有变化.文件名是希腊文.
I try to send an email with an attachment (A pdf file), but the receiver receives a file with a different name and without the .pdf ending. The name of the file is in Greek..
try {
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress("from@mail.com"));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(mail));
message.setSubject(title,"utf-8");
// Create the message part
BodyPart messageBodyPart = new MimeBodyPart();
// Now set the actual message
messageBodyPart.setText("This is message body");
// Create a multipar message
Multipart multipart = new MimeMultipart();
// Set text message part
multipart.addBodyPart(messageBodyPart);
// Part two is attachment
messageBodyPart = new MimeBodyPart();
String filename = "file.pdf";
String f = name + " Πρόγραμμα Ιανουάριος 2016.pdf"; // the desired name of the file
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(MimeUtility.encodeText(f, "UTF-8", null));
multipart.addBodyPart(messageBodyPart);
// Send the complete message parts
message.setContent(multipart);
Transport.send(message);
System.out.println("Mail " + mail +" sent");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
name是一个字符串变量，之前已获取一个值.奇怪的是，如果我有String f = name + " αααα.pdf"，接收器会成功获取名为Ρουβάς αααα.pdf的pdf，但是如果我有此字符串f = name + " Πρόγραμμα Ιανουάριος 2016.pdf";，他就不会.他越来越喜欢
=_UTF-8_B_zpzOtc Dz4POsc67zrHPgiDOmc6xzr3Ov8 FzqzPgc65zr_Pgi___ ___filename_1=__5wZGY=_=
the name is a string variable and is getting a value previously. The strange is that if I have String f = name + " αααα.pdf" the receiver is getting a pdf succesfully with the name Ρουβάς αααα.pdf but if i have this String f = name + " Πρόγραμμα Ιανουάριος 2016.pdf"; he doesn't. He is getting sth like
=_UTF-8_B_zpzOtc Dz4POsc67zrHPgiDOmc6xzr3Ov8 FzqzPgc65zr_Pgi___ ___filename_1=__5wZGY=_=
我添加了message.writeTo(System.out);，我得到了:
MIME-Version: 1.0
Content-Type: multipart/mixed;
bou
ndary="----=_Part_0_1825884453.1457025565509"
------=_Part_0_1825884453.1457025565509
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
This is message body
------=_Part_0_1825884453.1457025565509
Content-Type: application/octet-stream;
name*0="=?UTF-8?B?zpzOtc+Dz4POsc67zrHPgiDOmc6xzr3Ov8+FzrHPgc6vzr/Pgi";
name*1="Ay?=
=?UTF-8?B?MDE2zpnOsc69zr/Phc6sz4HOuc6/z4IgMjAxNi5wZGY=?";
name*2="="
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename*0="=?UTF-8?B?zpzOtc+Dz4POsc67zrHPgiDOmc6xzr3Ov8+FzrHPgc6vzr/Pgi";
filename*1="Ay?=
=?UTF-8?B?MDE2zpnOsc69zr/Phc6sz4HOuc6/z4IgMjAxNi5wZGY=?";
filename*2="="
与props.setProperty("mail.mime.encodeparameters", "false");或true
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_Part_0_797681969.1457074816557"
------=_Part_0_797681969.1457074816557
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
This is message body
------=_Part_0_797681969.1457074816557
Content-Type: application/octet-stream; name="?????????? 2016.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename*=Cp1252''%3F%3F%3F%3F%3F%3F%3F%3F%3F%3F%202016.pdf
推荐答案
由于您要自行编码文件名，因此您使用的是非标准MIME编码格式，如
Because you're encoding the filename yourself, you're using the non-standard MIME encoding format, as described in the JavaMail FAQ. That non-standard encoded text is then being split into multiple parameters using the standard RFC 2231 technique. It's this mix of non-standard and standard format that's probably causing the confusion for the mail reader.
通过删除对MimeUtility.encodeText的调用，尝试让JavaMail为您进行编码.如果不起作用，请将系统属性mail.mime.encodeparameters设置为false以禁用RFC 2231编码.
Try letting JavaMail do the encoding for you by removing the call to MimeUtility.encodeText. If that doesn't work, set the System property mail.mime.encodeparameters to false to disable the RFC 2231 encoding.
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