public static String toGBK(String source) throws UnsupportedEncodingException {

             StringBuilder sb = new StringBuilder();

            byte[] bytes = source.getBytes("GBK");

             for(byte b : bytes) {

                    sb.append("%" + Integer.toHexString((b & 0xff)).toUpperCase());

                }

            return sb.toString();

         }



//////////////////

URLDecoder.decode(str,"utf-8")  //解码


URLEncoder.encode(CityName.mCityName[i],"GBK")//转码