/* Vernetzte Systeme, WS 2001/2002, Übung 5, Aufgabe 21 a
 *
 * HTTP/1.0-Protokoll:
 * HTTP GET-Request mit Hilfe der Socket-Klasse.
 *
 * Pointers:
 * 
 * - Mehr über Lesen und Schreiben von/auf Datenströmen:
 *   http://java.sun.com/docs/books/tutorial/essential/io/index.html
 */

import java.net.*;  // Hier importieren wir unsere Socket "toolbox"
import java.io.*;   // Damit können wir Zeichen lesen und ausgeben

public class UserAgent21a {

   public static void main(String[] args) throws Exception {
      Socket mySocket = new Socket(args[0], 80);

      /* PrintWriter PrintStream 
       * Contain convenient printing methods. These are the easiest
       * streams to write to, so you will often see other writable
       * streams wrapped in one of these. 
       */                                 
      PrintWriter out = new PrintWriter (mySocket.getOutputStream(), true);

      /* InputStreamReader and OutputStreamWriter 
       * A reader and writer pair that forms the bridge between byte streams
       * and character streams. An InputStreamReader reads bytes from an
       * InputStream and converts them to characters using either the default
       * character-encoding or a character-encoding specified by name.
       * Similarly, an OutputStreamWriter converts characters to bytes using
       * either the default character-encoding or a character-encoding specified
       * by name and then writes those bytes to an OutputStream. 
       */
      InputStreamReader in = new InputStreamReader(mySocket.getInputStream());

      // send request (PrintWriter contains 'println' method)
      out.println("GET " + args[1] + " HTTP/1.0");
      out.println();

      // read answer
      int nextchar;
      while ((nextchar = in.read()) != -1) {
         System.out.print((char)nextchar);
      }

      out.close();
      in.close();
   } // of main

} // of UserAgent class