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424

Chapter 16 Using HTML Forms

Listing 16.9 EchoServer.java 

import java.net.*;

import java.io.*;

import java.util.StringTokenizer;

/** A simple HTTP server that generates a Web page

 *  showing all the data that it received from

 *  the Web client (usually a browser). To use this,

 *  start it on the system of your choice, supplying

 *  a port number if you want something other than

 *  port 8088. Call this system server.com. Next,

 *  start a Web browser on the same or a different

 *  system, and connect to http://server.com:8088/whatever.

 *  The resultant Web page will show the data that your browser

 *  sent. For debugging in servlet or CGI programming, 

 *  specify http://server.com:8088/whatever as the

 *  ACTION of your HTML form. You can send GET

 *  or POST data; either way, the resultant page

 *  will show what your browser sent.

 */

public class EchoServer extends NetworkServer {

  protected int maxRequestLines = 50;

  protected String serverName = "EchoServer";

  /** Supply a port number as a command line

   *  argument. Otherwise port 8088 will be used.

   */

  public static void main(String[] args) {

    int port = 8088;

    if (args.length > 0) {

      try {

        port = Integer.parseInt(args[0]);

      } catch(NumberFormatException nfe) {}

    }

    new EchoServer(port, 0);

  }

  public EchoServer(int port, int maxConnections) {

    super(port, maxConnections);

    listen();

  }

  /** Overrides the NetworkServer handleConnection

   *  method to read each line of data received, save it

   *  into an array of strings, then send it

   *  back embedded inside a PRE element in an

   *  HTML page.

   */

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