Java to do HTTP Post and read response's content

public void postToCallbackUrl()
    {

        
        int retry_count = 0;

        while (retry_count < 3)
        {
            try
            {
                // do HTTP request
                List<NameValuePair> formparams = new ArrayList<NameValuePair>();
                formparams.add(new BasicNameValuePair("print_image_url", printImageUrl));
                formparams.add(new BasicNameValuePair("signature_image_url", signatureImageUrl));
                formparams.add(new BasicNameValuePair("order_key", orderKey));

                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8");

                HttpPost httppost = new HttpPost(callbackUrl);
                httppost.setEntity(entity);

                HttpClient httpclient = new DefaultHttpClient();
                HttpResponse response = httpclient.execute(httppost);

                logger.debug("Got response:" + IOUtils.toString(response.getEntity().getContent(), "UTF-8"));

                break;
            }
            catch (Exception e) {
                retry_count++;

                logger.error("Post error",e);
            }
        }
    }