文件名中的JavaMail和非ASCII字符

我可以在 JavaMail中发送具有非ascii文件名的附件,但我无法下载它们.我特意为那些文件名包含非ascii字符的附件获取java.io.FileNotFoundException.

仅供参考：我正在使用类似messageBodyPart.setFileName(MimeUtility.encodeText(filename [i]))来编码文本和MimeUtility.decodeText(bodyPart.getFileName())来解码非ascii文件名

这有解决方法吗？

编辑
@Bill,这是我的代码的一部分,读取附件.我还在我的代码中添加了properties.setProperty(“mail.mime.decodeparameters”,“true”)和properties.setProperty(“mail.mime.decodefilename”,“true”)属性.

if (message[a].getContent() instanceof MimeMultipart) {
                Multipart multipart = (Multipart) message[a].getContent();
                for (int i = 0; i < multipart.getCount(); i++) {
                    bodyPart = multipart.getBodyPart(i);                     
                    disposition = bodyPart.getDisposition();                    
                    if (disposition != null && (disposition.equals(BodyPart.ATTACHMENT) || (disposition.equals(BodyPart.INLINE)))) {
                        DataHandler handler = bodyPart.getDataHandler(); 
                        String path = bodyPart.getFileName();
                        String[] str = path.split("/");                         
                        String fileName = str[str.length - 1];                       

                        String filePath = ReadConfigPropertiesFile.getPropertyValue("server.buildpath");
                        System.out.println(fileName);
                        File tempDir = new File(filePath + user);
                        if (!tempDir.exists()) {
                            tempDir.mkdir();
                        }
                        File saveFile = new File(tempDir + "/" + fileName);
                        int count = 0;
                        while (saveFile.exists()) {
                          count++;
                          saveFile = new File(tempDir + "/" + count + "_" + fileName);
                        } 

                        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(saveFile));
                        byte[] buff = new byte[2048];
                        InputStream is = bodyPart.getInputStream();
                        int ret = 0;
                        while ((ret = is.read(buff)) > 0) {
                            bos.write(buff,ret);
                        }
                        bos.close();
                        is.close();
                        //System.out.println(bodyPart.getContentType());


                    }else {
                        //display body (message) of the attachment;
                        //System.out.println(bodyPart.getContent().toString());

                   }
           }
     }

上面的代码在BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(saveFile))行引发了FileNotFoundException异常,并且对于文件名为非ascii字符的附件(类似于.pdf)引发了这种情况.其他一切都很好.

解决方法

MimeBodyPart attachment = new MimeBodyPart();
attachment.setFileName(MimeUtility.encodeText(filename,"UTF-8",null));

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