java.mail发附件时乱码

MimeBodyPart mbpFile = new MimeBodyPart();
   FileDataSource fileDataSource = new FileDataSource("/mnt/sdcard/ExtraBackup/"+ content);//
   mbpFile.setFileName(MimeUtility.encodeText(content));//设置附件名------------------------------------------------原来要设置名字
   mbpFile.setDataHandler(new DataHandler(fileDataSource));//加载附件
   multipart.addBodyPart(mbpFile);