Name: gsC80088 Date: 01/11/99


// A simple program to try the Authenticator class for a FTP connection
// When trying to download a file from an "anonymous" ftp site this program
// runs fine.
//
// But when a username,password is required the operation fails, and the function
// MyAuthenticator::getPasswordAuthentication() is not called as expected.
//

import java.io.*;
import java.net.*;

// override getPasswordAuthentication()
class MyAuthenticator extends Authenticator {

       public MyAuthenticator() {
         super() ;
         System.err.println("MyAuthenticator::MyAuthenticator() Called");
       }

      protected PasswordAuthentication getPasswordAuthentication() {
            System.err.println("MyAuthenticator::getPasswordAuthentication() Called");
            char[] pwd = {'r','o','b','f','_' };
            return new PasswordAuthentication("robf",pwd);
     }
}


//
public class ConnURL {
  public ConnURL (String[] args) {
    InputStream in = null;
    OutputStream out = null;
    try {
      // Check the arguments
      if ((args.length != 1) && (args.length != 2))
        throw new IllegalArgumentException("Wrong number of arguments");

      // Set up the streams
      URL url = new URL(args[0]); // Create the URL
     
      URLConnection urlC = url.openConnection() ;
       urlC.setAllowUserInteraction(true);
       urlC.setDoInput(true);
       urlC.connect();
     
       
      in = urlC.getInputStream(); // Open a stream to it
      if (args.length == 2) // Get an appropriate output stream
        out = new FileOutputStream(args[1]);
      else out = System.out;

      // Now copy bytes from the URL to the output stream
      byte[] buffer = new byte[4096];
      int bytes_read;
      while((bytes_read = in.read(buffer)) != -1)
        out.write(buffer, 0, bytes_read);
    }
    // On exceptions, print error message and usage message.
    catch (MalformedURLException e) {
      System.err.println(e);
      System.err.println("Usage: java GetURL <URL> [<filename>]");
    }
    catch (FileNotFoundException e) {
      System.err.println(e);
      System.err.println("File not found at URL");
    }
    catch (IOException e) {
      System.err.println(e);
      System.err.println("Error reading URL");
    }
    finally { // Always close the streams, no matter what.
      try { in.close(); out.close(); } catch (Exception e) {}
    }
  }


  public static void main(String[] args) {
      Authenticator auth = new MyAuthenticator();
      auth.setDefault(auth);
      new ConnURL(args);
   }
}
(Review ID: 40601)
======================================================================