2.3 Signature Generation (MD5)

 /**
     * @param map     Request Body
     * @param signKey
     * @return
     */
    public static String createSign(Map<String, Object> map, String signKey) {
        Set<String> kyes = new TreeSet<>(map.keySet());
        StringBuilder stringBuilder = new StringBuilder();
        Object v;
        for (String key : kyes) {
            v = map.get(key);
            if (ToolUtil.isNotEmpty(v) && !"sign".equals(key)) {
                stringBuilder.append(key).append("=").append(v).append("&");
            }
        }
        stringBuilder.setLength(stringBuilder.length() - 1);
        String str = stringBuilder.();
        log.info("String after parameter assembly:{}", str);
        String base64Str = Base64.encode(str);
        log.info("Encrypted String:{}", base64Str);
        log.info("signKey:{}", signKey);
        String sign = MD5Util.encrypt(base64Str + signKey);
        log.info("Generated Signature:{}", sign);
        return sign;
    }
    

    protected String SIGN_KEY = "F50E217D0D7447DC9B6A9F87806F41AC";
    protected String MERCHANT_NO = "3800068";
    /**
     * Send request, and encapsulate encrypted and signed data
     *
     * @param url
     * @param args
     */
    protected String sendRequest(String url, Object args) {
        //The first 16 digits are the signature key
        String signKey = SIGN_KEY.substring(0, 16);
        //The last 16 digits are AES keys
        String encryptKey = SIGN_KEY.substring(16);
        OpenApiReq param = new OpenApiReq();
        param.setMerchantNo(MERCHANT_NO);
        param.setData(AgentSignUtil.encrypt(args, encryptKey));
        param.setSign(AgentSignUtil.createSign(param, signKey));
        System.out.println("Request URL："+url+"；Request Body："+JSONObject.toJSONString(param));
        String result = HttpUtil.post(url, JSONObject.toJSONString(param));
        System.out.println("Request Result："+result);
        return result;
    }