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
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