Java file download file name garbled

What is the reason for garbled characters?
Each browser does not have the same encoding, Firefox uses base64.ie and Google uses URL encoding

So when we set the response header,
Content-type Getservletcontext (). Getminetype (filename);
Content-disposition accachment;filename= encoded filename

URL encoding
name = Urlencoder.encode (filename, "UTF-8");

Base64 encoding
/**

• The name of the incoming file for BASE64 encoding
• @param fileName
• @return
  */
  public string Base64encodefilename (string fileName) {
  Base64encoder Base64encoder = new Base64encoder ();
  try {
  Return "=? UTF-8? B? "
  • New String (Base64encoder.encode (fileName
    . GetBytes ("UTF-8")) + "? =";
    } catch (Unsupportedencodingexception e) {
    E.printstacktrace ();
    throw new RuntimeException (e);
    }
    }

Java file download file name garbled