How to fetch data of API through JSONArray

Question

//My API link
//http://gdata.youtube.com/feeds/base/videos?max-results=10&start-//index=1&alt=json&orderby=published&author=astrobixweb

//String Met         


        

Answer 1

Step 1 : copy the WEBSERVICE URL and paste in to your browser , this will hit the web service and will show you the response , use chrome will be more helpful to see the JSON response

Step 2 : analyse the structure of your JSON response first of all you will be reading the complete response as a String

create a JSON OBJECT from the String

now convert that JSON object into a JSONARRAY object ,

now that you have a JSONARRAY

iterate the JSON Array and store one by one Object

inside the iteration loop for JSON array , for each JSON OBJECT call the value by their name see in JSON you have key value pairs

you can call JSONOBJECT.getString("variable name which retrieves String ");

or you can get other datatypes like this also

try this on your own , post me the status , will be responding you with modified code afterwards ===================================================================

I tried to resolve it for you , here is the class

package com.hussain.StackOverFlow;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;


public class FarhaSameer1 {

    public static void main(String[] args) 
    {
        String asd = FarhaSameer1.sendRequest("http://gdata.youtube.com/feeds/base/videos?max-results=10&start-//index=1&alt=json&orderby=published&author=astrobixweb");
        FarhaSameer1.parseFromJSONResponse(asd);
    }
    // API link
    // http://gdata.youtube.com/feeds/base/videos?max-results=10&start-//index=1&alt=json&orderby=published&author=astrobixweb
    // String Method to fetech data from server
    public static String sendRequest(String url) {
        String result = "";
        try {
            HttpClient client = new DefaultHttpClient();
            HttpParams httpParameters = client.getParams();
            HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
            HttpConnectionParams.setSoTimeout(httpParameters, 5000);
            HttpConnectionParams.setTcpNoDelay(httpParameters, true);
            HttpGet request = new HttpGet();
            request.setURI(new URI(url));
            HttpResponse response = client.execute(request);
            InputStream ips = response.getEntity().getContent();
            BufferedReader buf = new BufferedReader(new InputStreamReader(ips,"UTF-8"));
            StringBuilder sb = new StringBuilder();
            String s;
            while (true) {
                s = buf.readLine();
                if (s == null || s.length() == 0)
                    break;
                sb.append(s);
            }
            buf.close();
            ips.close();
            result = sb.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    public static void parseFromJSONResponse(String respo) 
    {
        JSONObject myjson;
        try 
        {
            myjson = new JSONObject(respo);
            JSONObject jsonObj1 = myjson.getJSONObject("feed");
            JSONArray jsonObj2 = jsonObj1.getJSONArray("entry");
            JSONObject jsonObj3 = jsonObj2.getJSONObject(0);
            System.out.println(jsonObj3.getJSONObject("content"));
            System.out.println("here ===>>>"+jsonObj3.getJSONObject("content").get("$t").toString());
        } 
        catch (JSONException e) {
            e.printStackTrace();
        }
    }   
}

see the first method is the same as you wrote it in the second method i am trying to traverse the JSON response step by step. see you have to be careful about your JSON response

1 : your complete response is a JSON OBJECT

2 : if any element is written like

"some key name " : { " some value " }

this is a JSON Object

3 : if any element is writen like

 "some key name " :  " some value " 

this is value inside you json object which you can get by

jsonObject.getString("key name")

4 : if any element is writen like

"some key name " : [ " some value " ]

then this is a JSON Array and you have to take it in to a JSON ARRAY and then traverse its elements by

jsonObject.getJSONARRAY("key name for JSON ARRAY IN RESPONSE ")

and then you can traverse the elements of the JSON ARRAY by

`jsonArrayObj.get(0);`

now you can traverse and retrieve the value you want , post me if any help needed further