import java.net.*;import java.io.*;/** * Example program from Chapter 1 * Programming Spiders, Bots and Aggregators in Java * Copyright 2001 by Jeff Heaton * * WebServer is a very simple web-server.  Any request * is responded with a very simple web-page. * * @author Jeff Heaton * @version 1.0 */public class WebServer {  /**   * WebServer constructor.   */  protected void start()  {    ServerSocket s;    System.out.println("Webserver starting up on port 80");    System.out.println("(press ctrl-c to exit)");    try {      // create the main server socket      s = new ServerSocket(80);    } catch ( Exception e ) {      System.out.println("Error: " + e );      return;    }    System.out.println("Waiting for connection");    for ( ;; ) {      try {        // wait for a connection        Socket remote = s.accept();        // remote is now the connected socket        System.out.println("Connection, sending data.");        BufferedReader in = new BufferedReader(          new InputStreamReader(remote.getInputStream()) );        PrintWriter out        = new PrintWriter(remote.getOutputStream());        // read the data sent.  We basically ignore it,        // stop reading once a blank line is hit.  This        // blank line signals the end of the client HTTP        // headers.        String str=".";        while ( !str.equals("") )          str = in.readLine();        // Send the response        // Send the headers        out.println("HTTP/1.0 200 OK");        out.println("Content-Type: text/html");        out.println("Server: Bot");        // this blank line signals the end of the headers        out.println("");        // Send the HTML page        out.println(                   "<H1>Welcome to the Ultra Mini-WebServer</H2>");        out.flush();        remote.close();      } catch ( Exception e ) {        System.out.println("Error: " + e );      }    }  }  /**   * Start the application.   *   * @param args Command line parameters are not used.   */  public static void main(String args[])  {    WebServer ws = new WebServer();    ws.start();  }}