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How to iterate on a JSON objects using Java

Today we are going to see how to iterate on a JSON object or read a JSON file and fetch key and value from that JSON file using Java.

 Below is the example code snippet.



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package rashidjorvee;

import java.io.FileReader;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
public class JsonReader {
 /* JSON data file
  * [
    {
      "componentName": "comp1""compKey": [
        {
          "keyname": "json_key1",
          "props": [
            {
              "fieldLabel": "Jorvee",
              "name": "./productProperty",
              "id": "productID",
              "sling:resourceType": "granite/ui/components/foundation/form/textfield"
            }
          ]
        }
      ]
    },
    {
      "componentName": "comp2""compKey": [
        {
          "keyname": "json_key2",
          "props": [
            {
              "fieldLabel": "Rashid",
              "name": "./productProperty",
              "id": "productID",
              "sling:resourceType": "foundation/components/parsys"
            }
          ]
        }
      ]
    }
  ]
  */
 public static void main(String[] args) {
  try{
   JSONParser parser=new JSONParser();
   JSONArray a = (JSONArray) parser.parse(new FileReader("D:\\json/jsonFile.json"));
   for (Object comp:a) {
    JSONObject key1 = (JSONObject) comp;
    String componentName = (String) key1.get("componentName");
    System.out.println("componentName: "+componentName);
    JSONArray compkeys = (JSONArray) key1.get("compKey");
    for (Object o : compkeys)
    {
     JSONObject key = (JSONObject) o;
     String keyName = (String) key.get("keyname");
     System.out.println("KeyName: "+keyName);
     
     JSONArray keys = (JSONArray) key.get("props");
     for (Object prop : keys) {
      JSONObject properties = (JSONObject) prop;
      
      String name = (String) properties.get("name");
      System.out.println("Name: " +name);
      
      String fieldLabel = (String) properties.get("fieldLabel");
      System.out.println("City: "+fieldLabel);
      
      String job = (String) properties.get("sling:resourceType");
      System.out.println("resourceType: "+job);
      
      String id = (String) properties.get("id");
      System.out.println("ID: "+id);
      
     }
     System.out.println("\n");
    }
   }
  } catch(Exception e) {}

 }

}
at
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