Here’s a simple Java HTTPS client to demonstrate the use of HttpsURLConnection class to send a HTTP GET request yo get the https URL content and certificate detail.

P.S You may interest at this example – automate login a website with HttpsURLConnection.

HttpsClient.java

package com.mkyong.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();
			
	     //dumpl 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" ......
Note
For more detail usage, please refer to this example - Send HTTP Request GET/POST In Java

References

  1. Send HTTP Request GET/POST In Java
  2. Apache HttpClient examples