Java – How to send json data to a POST restful service

I want to call a rest webservice with a POST method. Here are the service URL I need to pass and its parameters

 Rest Service: https://url/SSOServer/SSO.svc/RestService/Login

Json Object {"ProductCode":"AB","DeviceType":"android Simulator","UserName":"","ModuleCode":"AB_MOBILE","DeviceId":"device-id","Version":"1.0.0.19","CustomerCode":"w"," Password":""}

Here is my post request code:

public void sendHttpPost() throws ClientProtocolException, IOException{
        HttpPost httpPostRequest = new HttpPost(url + buildParams());

 add headers
        Iterator it = headers.entrySet().iterator();
        Iterator itP = params.entrySet().iterator();
        while (it.hasNext()) {
            Entry header = (Entry) it.next();
            httpPostRequest.addHeader((String)header.getKey(), (String)header.getValue());
        }

HttpClient client = new DefaultHttpClient();
        HttpResponse resp;

resp = client.execute(httpPostRequest);

this.respCode = resp.getStatusLine().getStatusCode();
        Log.i(TAG, "response code: " + getResponseCode());
        this.responsePhrase = resp.getStatusLine().getReasonPhrase();
        Log.i(TAG, "error msg: " + getErrorMsg());
        HttpEntity entity = resp.getEntity();

if (entity != null){
            InputStream is = entity.getContent();
            Header contentEncoding = resp.getFirstHeader("Content-encoding");
            Log.i(TAG, "endoding" + contentEncoding.getValue());
            response = convertStreamToString(is);
            response = response.substring(1,response.length()-1);
            response = "{" + response + "}";
            Log.i(TAG, "response: " + response);
            is.close();
        }
    }

My question is how to add json data to this request?

Use the following class

public class RestClient
{
    private ArrayList<NameValuePair> params;
    private ArrayList<NameValuePair> headers;

private String url;

private int responseCode;
    private String message;

private String response;

public String getResponse()
    {
        return response;
    }

public String getErrorMessage()
    {
        return message;
    }

public int getResponseCode()
    {
        return responseCode;
    }

public RestClient(String url) {
        this.url = url;
        params = new ArrayList<NameValuePair>();
        headers = new ArrayList<NameValuePair>();
    }

public void AddParam(String name, String value)
    {
        params.add(new BasicNameValuePair(name, value));
    }

public void AddHeader(String name, String value)
    {
        headers.add(new BasicNameValuePair(name, value));
    }

public void Execute(RequestMethod method) throws Exception
    {
        switch (method)
        {
        case GET:
        {
             add parameters
            String combinedParams = "";
            if (!params.isEmpty())
            {
                combinedParams += "";
                for (NameValuePair p : params)
                {
                    String paramString = p.getName() + "" + URLEncoder.encode(p.getValue(),"UTF-8");
                    if (combinedParams.length() > 1)
                    {
                        combinedParams += "&" + paramString;
                    }
                    else
                    {
                        combinedParams += paramString;
                    }
                }
            }

HttpGet request = new HttpGet(url + combinedParams);

 add headers
            for (NameValuePair h : headers)
            {
                request.addHeader(h.getName(), h.getValue());
            }

executeRequest(request, url);
            break;
        }
        case POST:
        {
            HttpPost request = new HttpPost(url);

 add headers
            for (NameValuePair h : headers)
            {
                request.addHeader(h.getName(), h.getValue());
            }

if (!params.isEmpty())
            {
                request.setEntity(new UrlEncodedFormEntity(params, HTTP. UTF_8));
            }

executeRequest(request, url);
            break;
        }
        }
    }

private void executeRequest(HttpUriRequest request, String url) throws Exception
    {

HttpParams httpParameters = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpParameters,15000);
        HttpConnectionParams.setSoTimeout(httpParameters, 15000);
        HttpClient client = new DefaultHttpClient(httpParameters);

HttpResponse httpResponse;

httpResponse = client.execute(request);
            responseCode = httpResponse.getStatusLine().getStatusCode();
            message = httpResponse.getStatusLine().getReasonPhrase();

HttpEntity entity = httpResponse.getEntity();

if (entity != null)
            {

InputStream instream = entity.getContent();
                response = convertStreamToString(instream);

 Closing the input stream will trigger connection release
                instream.close();
            }

}

private static String convertStreamToString(InputStream is)
    {

BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

String line = null;
        try
        {
            while ((line = reader.readLine()) != null)
            {
                sb.append(line + "\n");
            }
        }
        catch (IOException e)
        {

e.printStackTrace();
        }
        finally
        {
            try
            {
                is.close();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
    public InputStream getInputStream(){
        HttpParams httpParameters = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpParameters,15000);
        HttpConnectionParams.setSoTimeout(httpParameters, 15000);
        HttpClient client = new DefaultHttpClient(httpParameters);

HttpResponse httpResponse;

try
        {

HttpPost request = new HttpPost(url);

httpResponse = client.execute(request);
            responseCode = httpResponse.getStatusLine().getStatusCode();
            message = httpResponse.getStatusLine().getReasonPhrase();

HttpEntity entity = httpResponse.getEntity();

if (entity != null)
            {

InputStream instream = entity.getContent();
                return instream;
             /*   response = convertStreamToString(instream);

 Closing the input stream will trigger connection release
                instream.close(); */
            }

}
        catch (ClientProtocolException e)
        {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        }
        catch (IOException e)
        {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        }
        return null;
    }
    public enum RequestMethod
    {
        GET,
        POST
    }
}

How to use the class above

RestClient client=new RestClient(Webservices.student_details);
JSONObject obj=new JSONObject();
obj.put("StudentId",preferences.getStudentId());
client. AddParam("",obj.toString());
client. Execute(RequestMethod.GET);
String response=client.getResponse();

Hope that helps