Read multiple json array with different names dynamically

Question

I have a JSON which has many arrays with a different name, just like below JSON.

{
  "CA": [
    {
      "high": 5,
      "low": 3,
      "key": "ABPS"
    },
    {
      "high": 6,
      "low": 2,
      "key": "ABPO"
    }
  ],
  "EE": [
    {
      "high": 8,
      "low": 4,
      "key": "ABPS"
    },
    {
      "high": 7,
      "low": 2,
      "key": "ABPO"
    }
  ]
}

I am trying to iterate JSON array values dynamically without specifying the name of the array.

I am able to read array with specifying the name of the array with below code but how to read array values dynamically without specifying the name of every array because the JSON file I have it has thousands of array.

package com.abc;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class JsonRead {

    private static final String filePath = "jsonTestFile.json";

    public static void main(String[] args) {

        try (FileReader reader = new FileReader(ClassLoader.getSystemResource(filePath).getFile())) {

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

            // get an array from the JSON object
            JSONArray lang = (JSONArray) jsonObject.get("CA");

            Iterator i = lang.iterator();

            // take each value from the json array separately
            while (i.hasNext()) {
                JSONObject innerObj = (JSONObject) i.next();
                System.out.println("high " + innerObj.get("high") + " low " + innerObj.get("low")+ " key " + innerObj.get("key"));
            }

        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

}

learner · Accepted Answer · 2020-06-10 12:05:28Z

0

This might help

for (Iterator iterator = jsonObject.keySet().iterator(); iterator.hasNext();) {
  String key = (String) iterator.next();
  JSONArray jArray = (JSONArray) jsonObject.get(key);
  }

answered Jun 10, 2020 at 12:05

learner

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