webserver.java

网络机器人

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();
  }
}