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

/*
 * A client to retrieve a web page using the URL package, instead
 * of raw socket. <p>
 * 
 * @author Xiannong Meng
 * @date   September 8, 2004
 *
 */
public class URLClient
{
   public static void main(String argv[]) throws Exception
   {
      URL u = new URL(argv[0]);  // argv is in the form "http://www.yahoo.com/"
      HttpURLConnection uC;
      int responseCode;
      InputStream input;
      BufferedReader remote;

      try
      {
	  // connet to the site
	  uC = (HttpURLConnection)u.openConnection(); 
	  System.out.println("port " + u.getPort());
	  responseCode = uC.getResponseCode();
      }
      catch (Exception ex)
      {
	  throw new Exception("first : " + ex.getMessage());
      }

      if (responseCode != HttpURLConnection.HTTP_OK)
      {
	  throw new Exception("HTTP response code : " + 
					 String.valueOf(responseCode));
      }

      try
      {
	  input = uC.getInputStream();
	  remote = new BufferedReader(new InputStreamReader(input));

	  String line = new String();

	  // we will read and print a few lines only
	  line = remote.readLine();
	  System.out.print(" first line :::::: ");
	  System.out.println(line);
   
	  line = remote.readLine();
	  System.out.print(" second line :::::: ");
	  System.out.println(line);

	  line = remote.readLine();
	  System.out.print(" second line :::::: ");
	  System.out.println(line);

	  System.out.println(" more lines ...");

	  System.out.println(remote.readLine());
	  System.out.println(remote.readLine());
	  System.out.println(remote.readLine());
	  System.out.println(remote.readLine());
	  System.out.println(remote.readLine());
	  System.out.println(remote.readLine());
	  System.out.println(remote.readLine());
	  System.out.println(remote.readLine());
      }
      catch (Exception ex)
      {
	  throw new Exception(ex.getMessage());
      }
      System.out.println(" host : " + u.getHost());
      System.out.println(" protocol : " + u.getProtocol());
      System.out.println(" port : " + u.getPort());
      System.out.println(" allow interaction : " + uC.getAllowUserInteraction());
      System.out.println(" allow interaction default : " + uC.getDefaultAllowUserInteraction());

      System.out.println("URL : " + uC.getURL());
      System.out.println("header : " + uC.getHeaderField("http"));
   }
}