The Java Developers Almanac 1.4

e139. Accessing a Password-Protected URL

    // Install the custom authenticator
    Authenticator.setDefault(new MyAuthenticator());
    
    // Access the page
    try {
        // Create a URL for the desired page
        URL url = new URL("http://hostname:80/index.html");
    
        // Read all the text returned by the server
        BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
        String str;
        while ((str = in.readLine()) != null) {
            // str is one line of text; readLine() strips the newline character(s)
        }
        in.close();
    } catch (MalformedURLException e) {
    } catch (IOException e) {
    }
    
    public class MyAuthenticator extends Authenticator {
        // This method is called when a password-protected URL is accessed
        protected PasswordAuthentication getPasswordAuthentication() {
            // Get information about the request
            String promptString = getRequestingPrompt();
            String hostname = getRequestingHost();
            InetAddress ipaddr = getRequestingSite();
            int port = getRequestingPort();
    
            // Get the username from the user...
            String username = "myusername";
    
            // Get the password from the user...
            String password = "mypassword";
    
            // Return the information
            return new PasswordAuthentication(username, password.toCharArray());
        }
    }

Related Examples

e132. Creating a URL
e133. Converting Between a URL and a URI
e134. Parsing a URL
e135. Sending a POST Request Using a URL
e136. Getting Text from a URL
e137. Getting an Image from a URL
e138. Getting a Jar File Using a URL

See also: Datagram    Encodings    HTTP    Hostnames and IP Addresses    Multicast    Sockets

© 2002 Addison-Wesley.