HttpClient demo with ssl

HttpClientWithSSL.java

import java.io.File;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.DefaultHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.apache.http.ssl.TrustStrategy;
import org.apache.http.util.EntityUtils;

class NegativeTrustStrategy implements TrustStrategy {
    public boolean isTrusted(X509Certificate[] chain, String authType)
            throws CertificateException {
        return false;   // Only trust the specific keystore file
    }
}

public class HttpClientWithSSL {
    private static final String[] SUPPORTED_PROTOCOLS = new String[]{"TLSv1"};

    public static void main(String[] args) throws Exception {
        SSLContextBuilder builder = SSLContexts.custom();
        builder.loadTrustMaterial(new File("client.jks"), "psw".toCharArray(),
                                  new NegativeTrustStrategy());

        SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(builder.build(),
                                                                          SUPPORTED_PROTOCOLS,
                                                                          null,
                                                                          new DefaultHostnameVerifier());

        CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf)
                                                    .build();
        try {

            HttpGet httpget = new HttpGet("https://localhost");
            System.out.println("Executing request " + httpget.getRequestLine());

            CloseableHttpResponse response = httpclient.execute(httpget);
            try {
                HttpEntity entity = response.getEntity();

                System.out.println("----------------------------------------");
                System.out.println(EntityUtils.toString(entity));
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }
    }
}