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.favtuts.http;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.cert.Certificate;
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 : TLS_AES_256_GCM_SHA384
Cert Type : X.509
Cert Hash Code : 741123545
Cert Public Key Algorithm : EC
Cert Public Key Format : X.509
Cert Type : X.509
Cert Hash Code : 266225904
Cert Public Key Algorithm : RSA
Cert Public Key Format : X.509
Cert Type : X.509
Cert Hash Code : 1081005260
Cert Public Key Algorithm : RSA
Cert Public Key Format : X.509
****** Content of the URL ********
<!doctype html><html><head><meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> .......Note
For more detail usage, please refer to this example – Send HTTP Request GET/POST In Java
Download Source Code
$ git clone https://github.com/favtuts/java-core-tutorials-examples
$ cd java-misc/http