CODEWITHSUNDEEP
javajson
Phant
Phant

Reputation: 83

JSON (simple) parsing of file returns null values

It's my first time working with a JSON file, so I went with simple JSON library. Here's what works:

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class ParseCardJSON {

    public static void main(String[] args) {

        JSONParser parser = new JSONParser();

        Object obj;

        try {
          obj = parser.parse(new FileReader("C:\\Users\\owner\\Desktop\\A\\programming\\workspace\\MTG\\AllSets.json"));
          JSONObject jsonObject = (JSONObject) obj;
          System.out.println(obj.toString());
          String name = (String) jsonObject.get("name");
          String color = (String) jsonObject.get("power");
          System.out.println("Name: " + name);
          System.out.println("color: " + color);

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

So the System.out.println(obj.toString()); prints out what I'm expecting:

({"LEA":{"name":"Limited Edition Alpha","code":"LEA","gathererCode":"1E","magicCardsInfoCode":"al","releaseDate":"1993-08-05","..)...

but the "name" and "color" prinlns are null. Any idea what could be wrong?

Upvotes: 2

Views: 4622

Answers (1)

Giuseppe Scopelliti
Giuseppe Scopelliti

Reputation: 132

This happen because the name property is not in the root.

In fact you have a LEA key that is in the root, and the value of that property is another Object, that contains the following keys : name, code, gathererCode, magicCardsInfoCode, etc...

So if you want extract the name property, you need to do something like this

JSONObject object = (JSONObject) jsonObject.get("LEA");
String name = (String) object.get("name");

This should fix the problem.

Upvotes: 3

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