Question

我正在使用json解析器对象解析json文件。我无法访问请求结构及其内部内容。我写的代码如下：

private static final String filePath = "D:\\score_api.json";


public static void main(String[] args) throws FileNotFoundException, IOException, ParseException {

            FileReader reader = new FileReader(filePath);

            JSONParser jsonParser = new JSONParser();
            JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);


            System.out.println("++++++++++++++++++\n"+jsonObject);
            // prints the whole json content. success!

            JSONObject structure = (JSONObject) jsonObject.get("provider");
            System.out.println("provider name: " + structure.get("name"));
            // prints the provider name. success!


            JSONArray req= (JSONArray) jsonObject.get("interactions");
            Iterator i = req.iterator();

           while (i.hasNext()) {
                JSONObject reqObj = (JSONObject) i.next();
                System.out.println("description: " + reqObj.get("description") +"\n");
                System.out.println("request body: " + reqObj.get("request")); // prints full request body 
                System.out.println("path: " + reqObj.get("path") +"\n"); // Failing, getting null value.
                System.out.println("reponse body: " + reqObj.get("response") +"\n"); // Success
           }
        }

它的输出是：

++++++++++++++++++++ {“完整的json文件内容打印”}
提供者名称：SIS 说明：API POST得分请求正文：{“完整的请求正文打印”} 路径：空响应正文：{“状态”：200}

我正在努力访问请求正文内容。及其子部分。我想访问“路径”的值以及其他内部值，例如“ adptPolVal”，“ eEcoId”和Source结构。

我是Java的新手，尝试但失败。任何帮助，将不胜感激！预先感谢！

这是我的json文件内容...

{
  "consumer": {
    "name": "Consumer1"
  },
  "provider": {
    "name": "provider_a"
  },
  "interactions": [
    {
      "description": "API Score",
      "providerStates": [
        {
          "name": "",
          "params": {}
        }
      ],
      "request": {
        "method": "post",
        "path": "Z123MI6/services/score",
        "headers": {
          "content-type": "application/json"
        },
        "body": {
          "adptPolVal": true,
          "datapoints": [
            {
              "dataId": " data.point.id ",
              "source": {
                "srcType": "sourceType.dev.admin",
                "snum": "12345",
                "instId": "intance id",
                "contId": "container id",
                "appId": "com.consumer."
              },
              "userId": "userId",
              "ts": 1234567891011,
              "lt": 11.12345,
              "lng": 123.456,
              "ipId": "192.168.1.1",
              "geoGraph": ""
            }
          ],
          "eEcoId": "ecoId"
        }
      },
      "response": {
        "status": 200
      }
    }
  ]
}

Answer 1

您可以尝试以下链接中提供的这些方法：

How to parse JSON in Java

Answer 2

尝试替换此行

JSONArray req= (JSONArray) jsonObject.get("interactions");

使用：

JSONArray req= (JSONArray)jsonObject.getJSONArray("interactions");

Answer 3

您可以使用以下类作为参考来获得所需的值。

请确保使用getJSONArray（）和getJSONObject（）方法适当地根据您的输出。

package com.test.test;

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.codehaus.jettison.json.JSONArray;
import org.codehaus.jettison.json.JSONException;
import org.codehaus.jettison.json.JSONObject;

public class Test {

    public static void main(String[] args) throws IOException, JSONException {
        String filePath = "C://Users//hello//Desktop//New Text Document.txt";
        String string = FileUtils.readFileToString(new File(filePath));
        JSONObject jsonObject = new JSONObject(string);
        JSONArray jsonArray = jsonObject.getJSONArray("interactions");
         for (int i = 0; i < jsonArray.length(); i++) {
             JSONObject reqObj = jsonArray.getJSONObject(i);
             System.out.println("description: " + reqObj.get("description") +"\n");
             System.out.println("request body: " + reqObj.get("request")); // prints full request body 
             System.out.println("reponse body: " + reqObj.get("response") +"\n"); // Success
             JSONObject requestBoday = reqObj.getJSONObject("request");
             JSONObject body = requestBoday.getJSONObject("body");

         }
    }
}

无法访问json文件内容

3 个答案: