Android : Android: can not use JSON parse in fragment with asynctask

I have a problem when trying to parse JSON data from localhost to fragment android using AsyncTask.

this my code FindPeopleFragment.java

public class FindPeopleFragment extends Fragment {
private ProgressDialog pDialog;
String nim;
JSONArray str_json = null;
String surl = "http://10.0.2.2/siakad/jadwal.php?nim=125410295&&jam=10:00 - 12:30";
TextView isinya;

public FindPeopleFragment(Bundle b){
    nim = b.getString("par_kode");

}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
{

    if (container == null)
    {
        return null;
    }


    View rootView = inflater.inflate(R.layout.fragment_find_people, container, false);
    isinya=(TextView)rootView.findViewById(R.id.isi);

    new AmbilData().execute();
    return rootView;
}

class AmbilData extends AsyncTask<String, Void, JSONObject> {
    String matkul;
    String ruang;
    String dosen;
    String sks;
    String jamkul;
    String kelas;
    String hari;

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(getActivity());
        pDialog.setMessage("Sabar gan, masih ngambil data neh...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(true);
        pDialog.show();


    }

    protected JSONObject doInBackground(String... result) {
        JSONParser jParser = new JSONParser();
        // Getting JSON from URL
        JSONObject json = jParser.AmbilJson(surl);
        return json;
    }


    @Override
    protected void onPostExecute(JSONObject result) {
      super.onPostExecute(result);
        pDialog.dismiss();
        try {
            str_json = result.getJSONArray("jadwal");

            for(int i = 0; i < str_json.length(); i++){
                JSONObject ar = str_json.getJSONObject(i);

                matkul= ar.getString("matkul");
                sks = ar.getString("sks");
                hari = ar.getString("hari");
                jamkul = ar.getString("jam");
                ruang = ar.getString("ruang");
                kelas = ar.getString("kelas");
                dosen = ar.getString("dosen");

                isinya.setText("Matakuliah : "+matkul+
                        "\nSks : "+sks+
                        "\nHari : "+hari+
                        "\nJam : "+jamkul+
                        "\nRuang : "+ruang+
                        "\nKelas : "+kelas+
                        "\nDosen : "+dosen);

        } catch (JSONException e) {
            e.printStackTrace();
            Log.e("hasil", "Failed data was:\n" + result);
        }

    }
}

}

and in my JSONParser.java

public class JSONParser {

static InputStream is = null;
static JSONObject jObj = null;
static String json = "";

// constructor
public JSONParser() {

}

public JSONObject AmbilJson(String url) {
    // Making HTTP request
    try {
      // defaultHttpClient
      DefaultHttpClient httpClient = new DefaultHttpClient();
      HttpPost httpPost = new HttpPost(url);
      HttpResponse httpResponse = httpClient.execute(httpPost);
      HttpEntity httpEntity = httpResponse.getEntity();
      is = httpEntity.getContent();
    } catch (UnsupportedEncodingException e) {
      e.printStackTrace();
    } catch (ClientProtocolException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    try {
      BufferedReader reader = new BufferedReader(new InputStreamReader(
          is, "iso-8859-1"), 8);
      StringBuilder sb = new StringBuilder();
      String line = null;
      while ((line = reader.readLine()) != null) {
        sb.append(line + "n");
      }
      is.close();
      json = sb.toString();
    } catch (Exception e) {
      Log.e("Buffer Error", "Error converting result " + e.toString());
    }
    // try parse the string to a JSON object
    try {
      jObj = new JSONObject(json);
    } catch (JSONException e) {
      Log.e("JSON Parser", "Error parsing data " + e.toString());
    }
    // return JSON String
    return jObj;
}

And I have some errors in my LogCat :

01-31 04:25:46.900: E/AndroidRuntime(2985): FATAL EXCEPTION: AsyncTask #4
01-31 04:25:46.900: E/AndroidRuntime(2985): java.lang.RuntimeException: An error occured while executing doInBackground()
01-31 04:25:46.900: E/AndroidRuntime(2985):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.lang.Thread.run(Thread.java:841)
01-31 04:25:46.900: E/AndroidRuntime(2985): Caused by: java.lang.IllegalArgumentException: Illegal character in query at index 58: http://10.0.2.2/siakad/jadwal.php?nim=125410295&&jam=10:00 - 12:30
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.net.URI.create(URI.java:727)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at org.apache.http.client.methods.HttpPost.<init>(HttpPost.java:79)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at sob.akademik.JSONParser.AmbilJson(JSONParser.java:35)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at sob.akademik.FindPeopleFragment$AmbilData.doInBackground(FindPeopleFragment.java:164)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at sob.akademik.FindPeopleFragment$AmbilData.doInBackground(FindPeopleFragment.java:1)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
01-31 04:25:46.900: E/AndroidRuntime(2985):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
01-31 04:25:46.900: E/AndroidRuntime(2985):     ... 4 more

please help me to fix this problem. thank you.