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;

• emerssso: Which JSON library are you using? JSON in Java, Jackson, etc?

Answer 1

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

Answer 2

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

Answer 3

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)