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Json parsing in Blackberry 5.0

I am developing an application in version for Blackberry 5.0, and I have imported the entire library that is required for json in version 5.0.

I had a download library from this URL http://supportforums.blackberry.com/t5/Java-Development/JSON-library/td-p/573687

even I do not get an answer that I missed in this code, please help me.

Below is my code. To parse json.

 package mypackage;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;

import JSON_ME_Library.src.org.json.me.JSONArray;
import JSON_ME_Library.src.org.json.me.JSONException;
import JSON_ME_Library.src.org.json.me.JSONObject;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.MainScreen;


public final class MyScreen extends MainScreen
{

    String url="http://www.appymail.com/iphone-messenger/456842/";

    public MyScreen()
    {                
        setTitle("Json Parsing Sample");

         String aa=jsonresponse(url);

        if(aa.equalsIgnoreCase(""))
        {
            add(new LabelField("NO res"));
        }
        else
        {
            parseJSONResponceInBB(aa);

        }


    }



    void parseJSONResponceInBB(String jsonInStrFormat)
    {  


        try {  
            JSONObject json = new JSONObject(jsonInStrFormat);  
            JSONArray jArray= json.getJSONArray("messages");  

            //JSONArray arr=jArray.getJSONArray(0);

            for(int i=0;i<jArray.length();i++)
            {  
                JSONObject j = jArray.getJSONObject(i);  
                String from = j.getString("id");         
                add(new LabelField("id=="+from));

                String to =j.getString("title");
                add(new LabelField("title=="+to));           

                String message=j.getString("body");                
                add(new LabelField("Body=="+message));

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



    }  

    public static String jsonresponse (String url) 
    { 
        String response = null; 
        HttpConnection httpConnection = null; 
        InputStream inStream = null; 
        int code; 
        StringBuffer stringBuffer = new StringBuffer();

        try { 

            httpConnection = (HttpConnection) Connector.open(url, Connector.READ); 
            httpConnection.setRequestMethod(HttpConnection.GET); 

            code = httpConnection.getResponseCode(); 

            if(code == HttpConnection.HTTP_OK) 
            { 
                inStream=httpConnection.openInputStream(); 
                int c; 


                while((c=inStream.read())!=-1) 
                { 
                  stringBuffer.append((char)c); 
                } 
                response=stringBuffer.toString(); 
                System.out.println("Response Getting from Server is ================" + response); 



            }
        else 
            { 
                UiApplication.getUiApplication().invokeLater(new Runnable() 
                { 

                    public void run()
                    {       
                        Dialog.inform("Connection error"); 
                    } 
                }); 
            } 


        } 
        catch (Exception e) 
        { 

            System.out.println("caught exception in jsonResponse method"+e.getMessage()); 

        } 
        finally
        {

        //      if (outputStream != null) 
        //      { 
        //          outputStream.close(); 
        //      }
                if (inStream != null) 
                { 
                    try {
                        inStream.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } 
                }
                if (httpConnection != null ) 
                { 
                    try {
                        httpConnection.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } 
                } 
        }

        return response; 
    }


}
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2 answers

Hello dear, you need to use the URL extension for BlackBerry.

please try changing this line

  String aa=jsonresponse(url);

and

String aa=jsonresponse(url+";interface=wifi");

After successfully loading the data from the URL, then check that String aa is getting a value or not? if it receives data, then follow

try this if it works fine then go to the following link

URL Extension Guide

+1
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Enter Url in

     String url="Your url";
     String request=jsonresponse(url+";interface=wifi");
     String response = parseJSONResponceInBB(request);
     if(response .equalsIgnoreCase(""))
     {
        add(new LabelField("NO res"));
     }
     else
     {
        add(new LabelField(response ));
     }
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