Jason Parser Simple JavaExample

  

While   coding application  we  need to parse  the  Json  file  , this example  give you  step by step coding  in java to parse a  simple Json file.


Maven  dependency   to  run this code .  OR  add  jar   file  file   in the  class path 

json-simple-1.1.1.jar



    com.googlecode.json-simple
    json-simple
    1.1

bhubaba.json



{

  "id": 1,

  "firstname": " Bhikubaba",

  "languages": [

    {

      "lang": "en",

      "knowledge": "proficient"

    },

    {

      "lang": "fr",

      "knowledge": "advanced"

    }

  ],

  "job": {

    "site": "https://javabhirkuti.blogspot.com",

    "name": "Bhirkutisoft"

  }

}

<![endif]-->

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;

/**

 * Json Parsor  Example

    @Mukesh Jha

  **/

public class JsonParseTest {

    private static final String filePath = "/Users/macbook/Documents/mypath/bhubaba.json";

     

    public static void main(String[] args) {

        try {

            // read the json file

            FileReader reader = new FileReader(filePath);

            JSONParser jsonParser = new JSONParser();

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

            // get a String from the JSON object

            String firstName = (String) jsonObject.get("firstname");

            System.out.println("The first name is: " + firstName);

            // get a number from the JSON object

            long id =  (long) jsonObject.get("id");

            System.out.println("The id is: " + id);

            // get an array from the JSON object

            JSONArray lang= (JSONArray) jsonObject.get("languages");

             

            // take the elements of the json array

            for(int i=0; i

                System.out.println("The " + i + " element of the array: "+lang.get(i));

            }

            Iterator i = lang.iterator();

            // take each value from the json array separately

            while (i.hasNext()) {

                JSONObject innerObj = (JSONObject) i.next();

                System.out.println("language "+ innerObj.get("lang") + 

                        " with level " + innerObj.get("knowledge"));

            }

            // handle a structure into the json object

            JSONObject structure = (JSONObject) jsonObject.get("job");

            System.out.println("Into job structure, name: " + structure.get("name"));

        } catch (FileNotFoundException ex) {

            ex.printStackTrace();

        } catch (IOException ex) {

            ex.printStackTrace();

        } catch (ParseException ex) {

            ex.printStackTrace();

        } catch (NullPointerException ex) {

            ex.printStackTrace();

        }

    }

}

The   main   important   thing to note is  that   you  need Json jar file to  execute the  code ,

after getting   Json   file   object   you  need  to  traverse the  each column of data if think  tabular  formate of same json data file . So  wirte    code   to retrieve each   json format of data. 




Program  Output 




The first name is: Bhikubaba

The id is: 1

The 0 element of the array: {"knowledge":"proficient","lang":"en"}

The 1 element of the array: {"knowledge":"advanced","lang":"fr"}

language en with level proficient

language fr with level advanced

Into job structure, name: Bhirkutisoft