For example, Apache HTTPClient at
http://jakarta.apache.org/commons/httpclient/features.html.

An example is attached below.

Arne

==============================================

import java.net.*;
import java.io.*;
import java.security.*;
import java.security.cert.*;

import javax.net.ssl.*;

public class HttpsGetAuth {
   public static void main(String[] args) {
      try {
         SSLContext sslctx = SSLContext.getInstance("SSL");
         sslctx.init(null, new X509TrustManager[] { new
MyTrustManager() }, null);

HttpsURLConnection.setDefaultSSLSocketFactory(sslctx.getSocketFactory());
         //HttpsURLConnection.setDefaultHostnameVerifier(new
MyHostnameVerifier());
         Authenticator.setDefault(new MyAuthenticator());
         URL url = new URL("https://www.xxxx.dk/prot4.html");
         HttpsURLConnection con = (HttpsURLConnection)
url.openConnection();
         if (con.getResponseCode() == HttpsURLConnection.HTTP_OK) {
            InputStream is = con.getInputStream();
            OutputStream os = new FileOutputStream("C:\\z.z");
            byte[] b = new byte[1000];
            int n;
            while ((n = is.read(b)) >= 0) {
               os.write(b, 0, n);
            }
            os.close();
            is.close();
         }
         con.disconnect();
      } catch (NoSuchAlgorithmException e) {
         e.printStackTrace();
      } catch (KeyManagementException e) {
         e.printStackTrace();
      } catch (MalformedURLException e) {
         e.printStackTrace();
      } catch (FileNotFoundException e) {
         e.printStackTrace();
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}

class MyTrustManager implements X509TrustManager
{
    public void checkClientTrusted(X509Certificate[] chain, String
authType) {
    }
    public void checkServerTrusted(X509Certificate[] chain, String
authType) {
    }
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }
}

//class MyHostnameVerifier implements HostnameVerifier {
//   public boolean verify(String urlHostName, SSLSession session) {
//      return true;
//   }
//}

class MyAuthenticator extends Authenticator {
   protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication("xxxx", "xxxx".toCharArray());
   }
}