Java Mailapi中的Umlaut角色支持

Question

MimeBodyPart mimebodypart = new MimeBodyPart();
DataSource datasource = new FileDataSource(file);
mimebodypart.setDataHandler(new DataHandler(datasource));
//mimebodypart.setFileName(MimeUtility.encodeText(file.getName(), "UTF-8", null));
mimebodypart.setFileName(file.getName());

在上面的代码中，我的文件名称为 pdftestöäüßüääötestdev2-13.06.2016.tiff 附件以untitled_000000456.tiff的＆lt; 000000456>是一个随机数。

使用Stöäüßüäö工作正常，但是当字符串更长时间时，即 e e stöäüßüäöäö它不起作用。

也是Öäüßüäöäüßüäöand testtestestest(任何长度(正在工作。

有人可以指出我在做什么错吗？

我正在使用Javamail Api Jar»1.5.6

https://mvnrepository.com/artifact/javax.mail/javax.mail-api/1.5.6

Java版本1.8

编辑

在某些标题后，我可以获取适当的文件名，但是丢失了消息主体。这是更新的代码。

try {
    Message message = new MimeMessage(Session.getInstance(System.getProperties()));
    message.setHeader("MIME-Version", "1.0");
    message.setHeader("Content-Disposition", "attachment; filename=""+ file.getName() +"""); 
    //file.getName() returns PDF "testöäüßÜÄÖtest DEV2 - 13.06.2016.tiff"
    message.saveChanges();
    String email_subject = "subject";
    message.setSubject(email_subject, "UTF-8", null));
    message.setSentDate(new Date());
    MimeBodyPart content = new MimeBodyPart();
    String msg_body = "Message body";
    content.setContent("<p style=font-style:italic;font-size:20px>"+ msg_body +" </p>", "text/html;charset=UTF-8");
    Multipart multipart = new MimeMultipart();
    multipart.addBodyPart(content);

    MimeBodyPart attachment = new MimeBodyPart();
    DataSource source = new FileDataSource(file); //file is of type File 
    attachment.setDataHandler(new DataHandler(source));
    multipart.addBodyPart(attachment);
    message.setContent(multipart);
    message.getFlags().add(Flags.Flag.DRAFT);
    OutputStream out = new FileOutputStream(fileName);
    //fileName.getName() returns PDF testöäüßÜÄÖtest DEV2 - 13.06.2016.eml
    message.writeTo(out);
    out.close();
    out=null;
}catch (Exception ex) {
    ex.printStackTrace();
}

我缺少身体的错误？

Answer 1

尝试这个更简单，更正确的版本：

Message message = new MimeMessage(Session.getInstance(System.getProperties()));
String email_subject = "subject";
message.setSubject(email_subject, "UTF-8");
message.setSentDate(new Date());
MimeBodyPart content = new MimeBodyPart();
String msg_body = "Message body";
content.setText("<p style=font-style:italic;font-size:20px>"+ msg_body +" </p>", "UTF-8", "html");
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(content);
MimeBodyPart attachment = new MimeBodyPart();
attachment.attachFile(file);
multipart.addBodyPart(attachment);
message.setContent(multipart);
message.setFlags(new Flags(Flags.Flag.DRAFT), true);
OutputStream out = new FileOutputStream(fileName);
message.saveChanges();
message.writeTo(out);
out.close();

如果那不起作用，请发布fileName引用的文件的内容。