alibaba fastjson

key按照字典排序 

JSONObject jsonObj = JSONObject.parseObject(JSONObject.toJSONString(orderRowResp), Feature.OrderedField);

StringBuilder strBuilder = new StringBuilder(secret);
String value;
for(String key : jsonObj.keySet()){
    value = jsonObj.getString(key);
    strBuilder.append(key).append(value);
}
strBuilder.append(secret);