Read Any Type Of JSON File in JAVA | Simple Introduction And Demo Of JavaScript Object Notation

Simple Explanation Of JSON

Agenda :

     1.    What is JSON

2.    Uses of JSON

3.    Data Types of JSON

4.    Characteristics of JSON

5.    Simple Example

1.    What is JSON 

• JSON-Java Script Object Notation
• JSON is syntax for storing and exchanging data.
• Basically, it was designed for human-readable data interchange
• It has been extended from the JavaScript language
• The filename extension is. json
• JSON internet media type is application/json

2.    Uses Of JSON

• Helps you to transfer data from server
• It is widely used for JavaScript-based applications that include browser add-ons
• Web services and APIs use the JSON format to get public data
• You can transmit the data between server and web application using JSON

3.    Data Types of JSON

• Number
• String
• Boolean
• Object
• Null
• Array

4.    Characteristics of JSON

• JSON is easy to read and write
• It is lightweight text-based interchange format
• JSON is language independent

5.    Simple Example

JSON Input:

{

    "firstName" : "Sam",

    "lastName" : "Ray",

    "address" :

    [

         {

             "street" : "vadgaon road",

             "city" : "pune",

             "state" : "MH"

        },

         {

             "street" : "Dehu road",

             "city" : "pune",

             "state" : "MH"

         }

    ]

}

Program:

package com.techhelpline.JSON;

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 ReadJSONFile {

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

      

             FileReader jsonReader=new FileReader("./JSONFolder/employeeDetails.json");

            

             JSONParser jsonParser=new JSONParser();

            

             Object object=jsonParser.parse(jsonReader);

            

             JSONObject jsonObject=(JSONObject) object;

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

             String lName=(String) jsonObject.get("lastName");

            

             System.out.println("fName: "+fName);

             System.out.println("lName: "+lName);

            

             JSONArray array=(JSONArray) jsonObject.get("address");

            

             for (int i = 0; i < array.size(); i++) {

                   

                    JSONObject addressObject=(JSONObject) array.get(i);

                   

                    String street=(String) addressObject.get("street");

                    String city=(String) addressObject.get("city");

                    String state=(String) addressObject.get("state");

                   

                  System.out.println("Address of "+i+ "object");

                  System.out.println("street:"+street+", city: "+city+", state: "+state);

                   

             }

      

       }

 }