www.pudn.com > jnp-src.rar > GrabPage.java

/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.net.*; 
import java.io.*; 
 
public class GrabPage { 
  public GrabPage (String textURL) throws IOException { 
    dissect (textURL); 
  } 
 
  protected String host, file; 
  protected int port; 
 
  protected void dissect (String textURL) throws MalformedURLException { 
    URL url = new URL (textURL); 
    host = url.getHost (); 
    port = url.getPort (); 
    if (port == -1) 
      port = 80; 
    file = url.getFile (); 
  } 
 
  public void grab () throws IOException { 
    connect (); 
    try { 
      fetch (); 
    } finally { 
      disconnect (); 
    } 
  } 
 
  protected Writer writer; 
  protected BufferedReader reader; 
 
  protected void connect () throws IOException { 
    Socket socket = new Socket (host, port); 
    OutputStream out = socket.getOutputStream (); 
    writer = new OutputStreamWriter (out, "latin1"); 
    InputStream in = socket.getInputStream (); 
    Reader reader = new InputStreamReader (in, "latin1"); 
    this.reader = new BufferedReader (reader); 
  } 
 
  protected void fetch () throws IOException { 
    writer.write ("GET " + file + " HTTP/1.0\r\n\n"); 
    writer.flush (); 
    PrintWriter console = new PrintWriter (System.out); 
    String input; 
    while ((input = reader.readLine ()) != null) 
      console.println (input); 
    console.flush (); 
  } 
 
  protected void disconnect () throws IOException { 
    reader.close (); 
  } 
 
  public static void main (String[] args) throws IOException { 
    Reader kbd = new FileReader (FileDescriptor.in); 
    BufferedReader bufferedKbd = new BufferedReader (kbd); 
    while (true) { 
      String textURL; 
      System.out.print ("Enter a URL: "); 
      System.out.flush (); 
      if ((textURL = bufferedKbd.readLine ()) == null) 
        break; 
 
      try { 
        GrabPage grabPage = new GrabPage (textURL); 
        grabPage.grab (); 
      } catch (IOException ex) { 
        ex.printStackTrace (); 
        continue; 
      } 
      System.out.println ("- OK -"); 
    } 
    System.out.println ("exit"); 
  } 
}