Java中json的解析修改和轉換

 使用中爲了統一返回的數據格式，需要我們處理json數據後，返回同樣的結果數據然後解析，測試案例如下：

package flinkonkafka;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.core.JsonProcessingException;
import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;



public class RequestJson {


    public static void main(String[] args) throws JsonProcessingException {
        String s = "{\"result\": {\"data\": [{\"code\": \"CF327\",\"value\": \"0.0016592020664306757\"},{\"code\": \"CF327\",\"value\": \"0.0016592020664306757\"}],\"message\": \"計算成功！\",\"status\": 0}}";

        JSONObject jsonobj = JSON.parseObject(s);
        JSONObject paramzObject = jsonobj.getJSONObject("result");
        JSONArray feedsArray = paramzObject.getJSONArray("data");
//這裏可以將我們的json字符串直接轉成我們需要的對象
        for (int i = 0; i < feedsArray.size(); i++) {
            JSONObject sonObject = feedsArray.getJSONObject(i);
            ObjectMapper mapper = new ObjectMapper();
            CalResultVo result = mapper.readValue(sonObject.toString(), CalResultVo.class);

            System.out.println(result.getCode());
        }

    }


    //獲取回調標籤計算的參數map
    public static Map<String, Object> getParameterJsonMap(String json) {
        //將json字符串轉換成jsonObject對象
        JSONObject jsonobj = JSON.parseObject(json);
        JSONObject jsonParm = jsonobj.getJSONObject("parameter");
        Map<String, Object> parameterMap = (Map) JSON.parse(jsonParm.toString());
        return parameterMap;
    }


    public String getCallbackUrl(String json) {
        JSONObject jsonobj = JSON.parseObject(json);
        String callbackUrl = jsonobj.getString("callbackUrl");
        return callbackUrl;
    }

    //返回封裝的 json結果數據
    public static String callBackJson(String json, Long handleTs, String data, String message) {//List<CalResultVo>
        JSONObject jsonobj = JSON.parseObject(json);
        JSONObject jsonResult = jsonobj.getJSONObject("result");
        Map<String, Object> result = (Map) JSON.parse(jsonResult.toString());

        result.put("data", data); //返回計算結果
        result.put("message", message);//返回響應信息

        jsonobj.put("result", result);
        jsonobj.put("handleTs", handleTs); //處理結束時間

        return jsonobj.toString();
    }


}

最後的結果json如下:

{
	"result": {
		"data": [{
			"code": "T001",
			"value": "0.0735855686"
		}],
		"message": "計算成功！",
		"status": 0
	},
	"requestType": "SYNC",
	"idxCode": "001",
	"requestId": "0.01",
	"parameter": {
		"flinkPort": 8081,
		"port": "2181",
		"hengheUser": "sa"
	},
	"handleTs": 1593674776820,
	"topic": "topic-test",
	"createTs": "1593674770",
}