HttpsDownload.javaAPI DocExample2572Wed Apr 20 15:13:14 BST 2005None


public class HttpsDownload extends Object
Get a document from a web server using HTTPS. Usage: java HttpsDownload

Fields Summary
Constructors Summary
Methods Summary
public static voidmain(java.lang.String[] args)

        // Get a SocketFactory object for creating SSL sockets
        SSLSocketFactory factory =
            (SSLSocketFactory) SSLSocketFactory.getDefault();

        // Use the factory to create a secure socket connected to the 
        // HTTPS port of the specified web server.
        SSLSocket sslsock=(SSLSocket)factory.createSocket(args[0], // Hostname
                                                            443); // HTTPS port

        // Get the certificate presented by the web server
        SSLSession session = sslsock.getSession();
        X509Certificate cert;   
        try { cert = (X509Certificate)session.getPeerCertificates()[0]; }
        catch(SSLPeerUnverifiedException e) { // If no or invalid certificate
            System.err.println(session.getPeerHost() +
                               " did not present a valid certificate.");

        // Display details about the certificate
        System.out.println(session.getPeerHost() + 
                           " has presented a certificate belonging to:");
        System.out.println("\t[" + cert.getSubjectDN().getName() + "]");
        System.out.println("The certificate bears the valid signature of:");
        System.out.println("\t[" + cert.getIssuerDN().getName() + "]");

        // If the user does not trust the certificate, abort
        System.out.print("Do you trust this certificate (y/n)? ");
        BufferedReader console =
            new BufferedReader(new InputStreamReader(;
        if (Character.toLowerCase(console.readLine().charAt(0)) != 'y") return;

        // Now use the secure socket just as you would use a regular socket
        // First, send a regular HTTP request over the SSL socket
        PrintWriter out = new PrintWriter(sslsock.getOutputStream());

        out.print("GET " + args[1] + " HTTP/1.0\r\n\r\n");

        // Next, read the server's response and print it to the console
        BufferedReader in = 
         new BufferedReader(new InputStreamReader(sslsock.getInputStream()));
        String line;
        while((line = in.readLine()) != null) System.out.println(line);
        // Finally, close the socket