Perform Http request using java.net or Apache HttpClient

HttpRequests.java.java

package ga.summedia.snippets;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.BasicHttpEntity;
import org.apache.http.entity.BufferedHttpEntity;
import org.apache.http.entity.HttpEntityWrapper;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

public class Snippets {

    private final String USER_AGENT = "Mozilla/5.0";

    public Snippets() {
    }


    public static void main(String... args) {
        System.out.println("Snippet start...");

        final Snippets snippets = new Snippets();

        /**
         * Http requests using HttpUrlConnection from java.net
         */
//        snippets.sendGETRequestv1("https://www.qwant.com/?q=demica");
//        snippets.sendPOSTRequestv1("https://selfsolve.apple.com/wcResults.do");

        /**
         * Http requests using Apache CloseableHttpClient
         */
//        snippets.sendGETRequestv2("https://www.qwant.com/?q=demica");
        snippets.sendPOSTRequestv2("https://selfsolve.apple.com/wcResults.do");

        System.out.println("Snippet end...");
    }


    public void sendGETRequestv1(final String url) {
        try {
            //Open HTTP connection
            final URL urlObj = new URL(url);
            final HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();

            //Optional: Set HTTP method type (Default is GET)
            conn.setRequestMethod("GET");
            //Add request property
            conn.setRequestProperty("User-Agent", USER_AGENT);

            int responseCode = conn.getResponseCode();
            System.out.println("Send http GET request...");
            System.out.println("Request status..." + responseCode);

            final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String responseContentLine;
            StringBuilder responseBody = new StringBuilder();
            while ((responseContentLine = bufferedReader.readLine()) != null) {
                responseBody.append(responseContentLine);
            }
            System.out.print(responseBody);

            bufferedReader.close();
            conn.disconnect();

            System.out.println("\nRequest completed successfully.");
        } catch (final MalformedURLException e) {
            e.printStackTrace();
        } catch (final IOException e) {
            e.printStackTrace();
        }
    }


    public void sendPOSTRequestv1(final String url) {
        final String urlParams = "sn=C02G8416DRJM&cn=&locale=&caller=&num=12345";

        try {
            //Open HTTP connection
            final URL urlObj = new URL(url);
            final HttpURLConnection conn = (HttpURLConnection) urlObj.openConnection();

            //Set HTTP method type as POST (Default is GET)
            conn.setRequestMethod("POST");
            //Add request properties (HEADERS)
            conn.setRequestProperty("User-Agent", USER_AGENT);
            conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
            conn.setDoOutput(true); //Indicates the request is sending out data

            final DataOutputStream dataOutputStream = new DataOutputStream(conn.getOutputStream());
            dataOutputStream.writeBytes(urlParams);
            dataOutputStream.flush();
            dataOutputStream.close();

            //Fetch response
            int responseCode = conn.getResponseCode();
            System.out.println("\nSending http POST request...(" + url + ")");
            System.out.println("Request parameters...(" + urlParams + ")");
            System.out.println("Request status..." + responseCode);

            final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String responseContentLine;
            StringBuilder responseBody = new StringBuilder();

            while ((responseContentLine = bufferedReader.readLine()) != null) {
                responseBody.append(responseContentLine);

            }

            System.out.print(responseBody);

            bufferedReader.close();
            conn.disconnect();

            System.out.println("\nRequest completed successfully.");
        } catch (final MalformedURLException e) {
            e.printStackTrace();
        } catch (final IOException e) {
            e.printStackTrace();
        }
    }


    public void sendGETRequestv2(final String url) {

        //Build client
        try (final CloseableHttpClient httpClient = HttpClientBuilder.create().setUserAgent(USER_AGENT).build()) {

            final HttpGet request = new HttpGet();
            request.setURI(new URL(url).toURI());

            final HttpResponse response = httpClient.execute(request);
            final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader((response.getEntity().getContent())));

            int responseCode = response.getStatusLine().getStatusCode();
            System.out.println("Send http GET request...(" + url + ")");
            System.out.println("Request status..." + responseCode);

            String bufferReaderLine;
            final StringBuilder stringBuilder = new StringBuilder();
            while ((bufferReaderLine = bufferedReader.readLine()) != null) {
                stringBuilder.append(bufferReaderLine);
            }

            bufferedReader.close();
            System.out.print(response);

            System.out.println("\nRequest completed successfully.");
        } catch (final IOException ioE) {
            ioE.printStackTrace();
        } catch (final URISyntaxException e) {
            e.printStackTrace();
        }
    }


    public void sendPOSTRequestv2(final String url) {

        try (final CloseableHttpClient httpClient = HttpClientBuilder.create().setUserAgent(USER_AGENT).build()) {

            final HttpPost httpPost = new HttpPost();
            httpPost.setURI(new URL(url).toURI());
            httpPost.setConfig(RequestConfig.custom().setNormalizeUri(true).setRedirectsEnabled(true).build());

            final List<NameValuePair> urlParameters = new ArrayList<>();
            urlParameters.add(new BasicNameValuePair("sn", "C02G8416DRJM"));
            urlParameters.add(new BasicNameValuePair("cn", ""));
            urlParameters.add(new BasicNameValuePair("locale", ""));
            urlParameters.add(new BasicNameValuePair("caller", ""));
            urlParameters.add(new BasicNameValuePair("num", "12345"));

            httpPost.setEntity(new UrlEncodedFormEntity(urlParameters));

            final HttpResponse response = httpClient.execute(httpPost);
            final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

            String line;
            final StringBuilder responseBody = new StringBuilder();
            while ((line = bufferedReader.readLine()) != null) {
                responseBody.append(line);
            }
            System.out.print(responseBody);

            System.out.println("\nRequest completed successfully.");
        } catch (IOException e) {
            e.printStackTrace();
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }


    }


}