private static String getSign(Map<String,String> nutMap, String urlData, String session_key) {
        Set<String> set1 = nutMap.keySet();
        String[] arrayToSort1 = set1.toArray(new String[set1.size()]);
        Arrays.sort(arrayToSort1,String.CASE_INSENSITIVE_ORDER);
        StringBuilder stringBuilder1 = new StringBuilder("");
        for (String str : arrayToSort1) {
            if (stringBuilder1.toString().equals("")) {
                stringBuilder1.append(str + "=" + nutMap.get(str));
            } else {
                stringBuilder1.append("&" + str + "=" + nutMap.get(str));
            }
        }
        log.info("buy|stringBuilder1=" + stringBuilder1.toString());

        String temp = "";
        try {
            stringBuilder1.append(urlData);
//            log.info("buy|stringBuilder1=" + stringBuilder1.toString());
            temp = SnsSigCheck.encodeUrl(stringBuilder1.toString());
            log.info("buy|aaaaaaaaaa=" + stringBuilder1.toString().equals(temp));
        }catch (Exception e){

        }

        String mp_sig = null;//
        try {
            Mac mac = Mac.getInstance("HmacSHA256");
            SecretKeySpec secretKey = new SecretKeySpec(session_key.getBytes("UTF-8"), mac.getAlgorithm());
            mac.init(secretKey);
            byte[] hash = mac.doFinal(temp.getBytes("UTF-8"));
            mp_sig = new String(Base64Coder.encode(hash));
        }catch (Exception e){
            Logs.get().error("=========e="+ Lang.getStackTrace(e));
        }
        return mp_sig;
    }