Java string to json object

Question

I'm trying to use Json with android I have a link that returns a Json string

InputStream is = new URL(url).openStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String jsonText = readAll(rd);
JSONObject json = new JSONObject(jsonText);

but, on making a new JSONObject(jsonText); it crushes.

Here is my URL : http://igorsdomain.byethost3.com/getUser.php?username=SailorBoogy&password=qwerty&event=2222

This is the object returned : {"ID":"23","Username":"SailorBoogy","Password":"qwerty","eventID":"6"}

I tried also to JSONObject(jsonText.replaceAll("\"" , "\\\\\"")); but it didn't work.

What's the problem ? am I using it wrong ?

Json Libraries :

org.json.JSONException; org.json.JSONObject; org.json.JSONStringer;

Which JSON library are you using? JSON in Java, Jackson, etc? — emerssso, Apr 16 '15 at 16:33

score 2 · Answer 1 · answered Apr 16 '15 at 17:33

I strongly recommend you to use networking libraries such as Volley,Loopj,Okhttp for network operations.

Here is code for your problem.

class LongOpreation extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... params) {

        String str = "";

        try {
            str = sendGetRequest();

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return str;
    }

    public String sendGetRequest() throws MalformedURLException {
        StringBuilder response = new StringBuilder();
        String requrl = "";
        requrl = "http://igorsdomain.byethost3.com/getUser.php?username=SailorBoogy&password=qwerty&event=2222";
        response = requestExecuter(requrl);


        return response.toString();

    }


    @Override
    protected void onPostExecute(String result) {
        try {
            JSONObject jsonObject = new JSONObject(result);
            System.out.println("json-----------------------"+jsonObject);
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    @Override
    protected void onPreExecute() {

    }
    public StringBuilder requestExecuter(String str) {
        StringBuilder response = new StringBuilder();
        try {
            URL url = new URL(str);

            HttpURLConnection httpconn = (HttpURLConnection) url
                    .openConnection();
            httpconn.setConnectTimeout(5000);
            httpconn.setReadTimeout(10000);

            if (httpconn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                BufferedReader input = new BufferedReader(
                        new InputStreamReader(httpconn.getInputStream()));
                String strLine = null;
                while ((strLine = input.readLine()) != null) {
                    response.append(strLine);

                }
                input.close();
            }
            } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return response;
    }
}

Simpley callnew LongOperation().execute(""); and you are done

score 1 · Accepted Answer · edited May 23 '17 at 11:50

First OF all Get your json in network thread like asynchronousTask.

 DefaultHttpClient   httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost(http://someJSONUrl/jsonWebService);
// Depends on your web service
httppost.setHeader("Content-type", "application/json");

InputStream inputStream = null;
String result = null;
try {
HttpResponse response = httpclient.execute(httppost);           
HttpEntity entity = response.getEntity();

inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();

String line = null;
while ((line = reader.readLine()) != null)
{
    sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) { 
// Oops
}
finally {
try{if(inputStream != null)inputStream.close();}catch(Exception squish){}
}

And than parse it like this

try {
        JSONObject jObject = new JSONObject(result);
        Log.d("username", jObject.getString("Username"));
        Toast.makeText(getApplicationContext(), jObject.getString("Username"), Toast.LENGTH_LONG).show();
        Log.d("Password", jObject.getString("Password"));
        Log.d("eventID", jObject.getString("eventID"));
    } catch (JSONException e) {
        e.printStackTrace();
    }

For more info checkthis

score 0 · Answer 3 · answered Apr 16 '15 at 16:37

Without the LogCat it's hard to say, but probably you are doing network operations on MainThread, and Android is complaining with that (because it's a blocking operation, so the UI will freeze) by throwing a android.os.NetworkOnMainThreadException. If this is the case you can solve by doing this operation in another thread (e.g. by using an AsyncTask, or an external library, such as AndroidAsyncHttp)

Java string to json object

3 Answers3