Usage of Apache Http Client

HttpClientUtils.java

public final class HttpClientUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientUtils.class);

    private static final int CONNECTION_TIMEOUT = 10000;

    private HttpClientUtils() {
    }

    /**
     * Performs GET request on requested url and reads the response content from it.
     *
     * @param url url to get response from
     *
     * @return http GET response
     * @throws IOException if any error occurs
     */
    public static ClientResponse proceedGetRequest(final String url) throws IOException {
        try (final CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(createRequestTimeout()).build()) {
            final HttpGet request = new HttpGet(url);

            final HttpResponse response = client.execute(request);
            final String responseString = HttpClientUtils.readResponseContent(response);
            final int responseStatus = response.getStatusLine().getStatusCode();
            final ClientResponse clientResponse = new ClientResponse(responseString, responseStatus);

            LOGGER.trace("Response : {}", responseString);
            LOGGER.debug("Response Code : {}", responseStatus);

            return clientResponse;
        }
    }

    /**
     * Performs POST request on requested url with form parameters and reads the response content from it.
     *
     * @param url url to get response from
     *
     * @return http POST response
     * @throws IOException if any error occurs
     */
    public static ClientResponse proceedPostRequest(final String url, final List<NameValuePair> formParameters) throws IOException {
        try (final CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(createRequestTimeout()).build()) {
            final HttpPost request = new HttpPost(url);
            request.setEntity(new UrlEncodedFormEntity(formParameters));

            final HttpResponse response = client.execute(request);
            final String responseString = HttpClientUtils.readResponseContent(response);
            final int responseStatus = response.getStatusLine().getStatusCode();
            final ClientResponse clientResponse = new ClientResponse(responseString, responseStatus);

            LOGGER.trace("Response : {}", responseString);
            LOGGER.debug("Response Code : {}", responseStatus);

            return clientResponse;
        }
    }

    /**
     * Performs POST request with json content on requested url and reads the response content from it.
     *
     * @param url url to get response from
     *
     * @return http POST response
     * @throws IOException if any error occurs
     */
    public static ClientResponse proceedPostRequest(final String url, final String json) throws IOException {
        try (final CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(createRequestTimeout()).build()) {
            final HttpPost request = new HttpPost(url);
            final HttpEntity entry = new StringEntity(json, ContentType.create("application/json", Charset.forName("UTF-8")));
            request.setEntity(entry);

            final HttpResponse response = client.execute(request);
            final String responseString = HttpClientUtils.readResponseContent(response);
            final int responseStatus = response.getStatusLine().getStatusCode();
            final ClientResponse clientResponse = new ClientResponse(responseString, responseStatus);

            LOGGER.trace("Response : {}", responseString);
            LOGGER.debug("Response Code : {}", responseStatus);

            return clientResponse;
        }
    }

    private static String readResponseContent(final HttpResponse response) throws IOException {
        final StringBuilder result = new StringBuilder();

        try (final BufferedReader bufferedReader = new BufferedReader(
                new InputStreamReader(response.getEntity().getContent(), "UTF8"))) {

            String line;
            while ((line = bufferedReader.readLine()) != null) {
                result.append(line);
            }
        }

        return result.toString();
    }

    private static RequestConfig createRequestTimeout() {
        return RequestConfig.custom().setConnectTimeout(CONNECTION_TIMEOUT).setConnectionRequestTimeout(CONNECTION_TIMEOUT).build();
    }
}