How to Parse Nested JSON using JAVA

In this video I have shown how to Parse nested JSON response array using JAVA.
Using two real http request example,
1. ipinfodb.com: This website will give JSON response of IP location details for the HTTP request we give.
2. google map api : Google Map API will give JSON response of the Location details for the GEO coordinates http request.

To read json Response you will have to add java-jason.jar to class path.

1. Project Structure,

2. HTTP Request send to ipinfodb.com after registering to get the API Key,

   http://api.ipinfodb.com/v3/ip-city/?key=9d64fcfdfacc213c7ddf4ef911dfe97b55e4696bee3532bf830276c09ebad06b&ip=74.125.45.100&format=json
   

   JSON Response through SITE,

   {
   	"statusCode" : "OK",
   	"statusMessage" : "",
   	"ipAddress" : "74.125.45.100",
   	"countryCode" : "US",
   	"countryName" : "United States",
   	"regionName" : "Oklahoma",
   	"cityName" : "Tulsa",
   	"zipCode" : "74101",
   	"latitude" : "36.154",
   	"longitude" : "-95.9928",
   	"timeZone" : "-05:00"
   }
   

3. Get_Location_From_IP.java

   
   package com.chillyfacts.com;
   import java.io.BufferedReader;
   import java.io.InputStreamReader;
   import java.net.HttpURLConnection;
   import java.net.URL;
   import org.json.JSONObject;
   public class Get_Location_From_IP {
       public static void main(String[] args) {
           try {
               String ip = "74.125.45.100";
               String key = "9d64fcfdfacc213csfsfc7ddsf4ef911dfe97b55e4fdsf696be3532bf8302876c09ebad06b";
               String url = "http://api.ipinfodb.com/v3/ip-city/?key=" + key + "&ip=" + ip + "&format=json";
               URL obj = new URL(url);
               HttpURLConnection con = (HttpURLConnection) obj.openConnection();
               con.setRequestMethod("GET");
               con.setRequestProperty("User-Agent", "Mozilla/5.0");
               BufferedReader in = new BufferedReader(
                   new InputStreamReader(con.getInputStream()));
               String inputLine;
               StringBuffer response = new StringBuffer();
               while ((inputLine = in .readLine()) != null) {
                   response.append(inputLine);
               } in .close();
               System.out.println(response.toString());
               JSONObject obj_JSONObject = new JSONObject(response.toString());
               System.out.println("result after Reading JSON Response");
               System.out.println("statusCode- " + obj_JSONObject.getString("statusCode"));
               System.out.println("statusMessage- " + obj_JSONObject.getString("statusMessage"));
               System.out.println("ipAddress- " + obj_JSONObject.getString("ipAddress"));
               System.out.println("countryCode- " + obj_JSONObject.getString("countryCode"));
               System.out.println("countryName- " + obj_JSONObject.getString("countryName"));
               System.out.println("regionName- " + obj_JSONObject.getString("regionName"));
               System.out.println("cityName- " + obj_JSONObject.getString("cityName"));
               System.out.println("zipCode- " + obj_JSONObject.getString("zipCode"));
               System.out.println("latitude- " + obj_JSONObject.getString("latitude"));
               System.out.println("longitude- " + obj_JSONObject.getString("longitude"));
               System.out.println("timeZone- " + obj_JSONObject.getString("timeZone"));
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }
   

   Out put response after parsing the JSON Response,

   {	"statusCode" : "OK",	"statusMessage" : "",	"ipAddress" : "74.125.45.100",	"countryCode" : "US",	"countryName" : "United States",	"regionName" : "Oklahoma",	"cityName" : "Tulsa",	"zipCode" : "74101",	"latitude" : "36.154",	"longitude" : "-95.9928",	"timeZone" : "-05:00"}
   result after Reading JSON Response
   statusCode- OK
   statusMessage- 
   ipAddress- 74.125.45.100
   countryCode- US
   countryName- United States
   regionName- Oklahoma
   cityName- Tulsa
   zipCode- 74101
   latitude- 36.154
   longitude- -95.9928
   timeZone- -05:00
   

4. Register in Below link to get the API key for testing Get Coordinate location through google map api.

   https://developers.google.com/maps/documentation/geocoding/start

   HTTP Request we passed to get the response is,

   https://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&key=AIzaSyAE6FolYnePocr26o9spd7ZytyGVcM29jHk
   

   JSON Response for the HTTP request

5. Get_Cordinate_location.java

   
   package com.chillyfacts.com;
   import java.io.BufferedReader;
   import java.io.InputStreamReader;
   import java.net.HttpURLConnection;
   import java.net.URL;
   import org.json.JSONArray;
   import org.json.JSONObject;
   public class Get_Cordinate_location {
       public static void main(String[] args) {
           try {
               String key = "AIzaSyAE6FolYntrWscr26o9pd7ZytyGVcM29jHk";
               String url = "https://maps.googleapis.com/maps/api/geocode/json?latlng=40.714224,-73.961452&key=" + key;
               URL obj = new URL(url);
               HttpURLConnection con = (HttpURLConnection) obj.openConnection();
               // optional default is GET
               con.setRequestMethod("GET");
               //add request header
               con.setRequestProperty("User-Agent", "Mozilla/5.0");
               BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
               String inputLine;
               StringBuffer response = new StringBuffer();
               while ((inputLine = in .readLine()) != null) {
                   response.append(inputLine);
               } in .close();
               //  System.out.println(response.toString());
               JSONObject obj_JSONObject = new JSONObject(response.toString());
               JSONArray obj_JSONArray = obj_JSONObject.getJSONArray("results");
               System.out.println(obj_JSONArray);
               System.out.println("--" + obj_JSONArray.length());
               JSONObject obj_JSONObject2 = obj_JSONArray.getJSONObject(5);
               System.out.println("--element 5---");
               System.out.println(obj_JSONObject2);
               JSONArray address_components_array = obj_JSONObject2.getJSONArray("address_components");
               JSONObject obj_JSONObject3 = address_components_array.getJSONObject(0);
               System.out.println("long_name-" + obj_JSONObject3.getString("long_name"));
               System.out.println("short_name-" + obj_JSONObject3.getString("short_name"));
               System.out.println("formatted_address-" + obj_JSONObject2.getString("formatted_address"));
               System.out.println("formatted_address-" + obj_JSONObject2.getString("place_id"));
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }
   

   The response after parsing the JSON response,

   [{"formatted_address":"277 Bedford Ave, Brooklyn, NY 11211, USA","types":["street...
   --10
   --element 5---
   {"formatted_address":"Brooklyn, NY 11211, USA","types":["postal_code"],"geometry".....
   long_name-11211
   short_name-11211
   formatted_address-Brooklyn, NY 11211, USA
   formatted_address-ChIJvbEjlVdZwokR4KapM3WCFRw