public static String toText(byte [] bytes) {
    StringWriter sw = new StringWriter();

    int length = bytes.length;
    if(length > 0) {
      for(int i = 0; i < length; i++) {
        byte b = bytes [i];
        if(b > 64 && b < 91 || b > 96 && b < 123)
          sw.write((char)b);
      }
    }
    return(sw.toString());
  }