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Java HTTPS client example 

Dr. Xi
Joined:
04/09/2007
Posts:
753

April 05, 2011 08:04:37    Last update: April 05, 2011 08:11:37
There's no difference between a Java HTTP client and a Java HTTPS client. Ignore JavaWorld Java Tip 96, it's way too old. The following code gets an HTTP page as well as an HTTPS page. 
import java.io.*;
import java.net.*;

public class HTTPGet {
    public static void main(String[] args) throws Exception {
	if (args.length < 1) {
	    System.out.println("Usage: java HTTPGet <url>");
	    return;
	}

	URL url = new URL(args[0]);
	URLConnection conn = url.openConnection();
	BufferedReader in = new BufferedReader(
				new InputStreamReader(
				    conn.getInputStream()
				)
			    );
	String line = in.readLine();
	while (line != null) {
	    System.out.println(line);
	    line = in.readLine();
	}
    }
}


There's one catch. If you are using the code on a test server with a self-signed certificate, it fails. In that case, I would suggest that you download the certificate from the server and import it to your keystore as a trusted key. You may also need to add a subject alternative name to the certificate if the host name does not match the certificate.

You may also choose to use a custom TrustManager and HostnameVerifier to ignore the certificate verification errors.
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