拼接請求

   public static String builderUrl(String baseUrl, String method, Map<String,Object> param){
        StringBuilder sb = new StringBuilder(baseUrl)
                .append(method)
                .append("?contenttype=json");
        param.forEach((key, value) -> {
            sb.append("&").append(key).append("=").append(value);
        });
        return sb.toString();
    }