Here’s a simple Java HTTPS client to demonstrate the use of HttpsURLConnection class to print a https URL content and certificate detail.
Access https URL : https://www.google.com/
package br.com.ziben.client; import java.net.MalformedURLException; import java.net.URL; import java.security.cert.Certificate; import java.io.*; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLPeerUnverifiedException; public class HttpsClient{ public static void main(String[] args) { new HttpsClient().testIt(); } private void testIt(){ String https_url = "https://www.google.com/"; URL url; try { url = new URL(https_url); HttpsURLConnection con = (HttpsURLConnection)url.openConnection(); //dump all cert info print_https_cert(con); //dump all the content print_content(con); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } private void print_https_cert(HttpsURLConnection con){ if(con!=null){ try { System.out.println("Response Code : " + con.getResponseCode()); System.out.println("Cipher Suite : " + con.getCipherSuite()); System.out.println("\n"); Certificate[] certs = con.getServerCertificates(); for(Certificate cert : certs){ System.out.println("Cert Type : " + cert.getType()); System.out.println("Cert Hash Code : " + cert.hashCode()); System.out.println("Cert Public Key Algorithm : " + cert.getPublicKey().getAlgorithm()); System.out.println("Cert Public Key Format : " + cert.getPublicKey().getFormat()); System.out.println("\n"); } } catch (SSLPeerUnverifiedException e) { e.printStackTrace(); } catch (IOException e){ e.printStackTrace(); } } } private void print_content(HttpsURLConnection con){ if(con!=null){ try { System.out.println("****** Content of the URL ********"); BufferedReader br = new BufferedReader( new InputStreamReader(con.getInputStream())); String input; while ((input = br.readLine()) != null){ System.out.println(input); } br.close(); } catch (IOException e) { e.printStackTrace(); } } } }
Output…
Response Code : 200 Cipher Suite : SSL_RSA_WITH_RC4_128_SHA Cert Type : X.509 Cert Hash Code : 7810131 Cert Public Key Algorithm : RSA Cert Public Key Format : X.509 Cert Type : X.509 Cert Hash Code : 6042770 Cert Public Key Algorithm : RSA Cert Public Key Format : X.509 ****** Content of the URL ******** <!doctype html><html><head><meta http-equiv="content-type" ......
That’s it!
