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16.12 A Debugging Web Server

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Listing 16.11 NetworkServer.java 

import java.net.*;

import java.io.*;

/** A starting point for network servers. You'll need to

 *  override handleConnection, but in many cases

 *  listen can remain unchanged. NetworkServer uses

 *  SocketUtil to simplify the creation of the

 *  PrintWriter and BufferedReader.

 *  @see SocketUtil

 */

public class NetworkServer {

  private int port, maxConnections;

  /** Build a server on specified port. It will continue

   *  to accept connections, passing each to

   *  handleConnection, until an explicit exit

   *  command is sent (e.g., System.exit) or the

   *  maximum number of connections is reached. Specify

   *  0 for maxConnections if you want the server

   *  to run indefinitely.

   */

  public NetworkServer(int port, int maxConnections) {

    setPort(port);

    setMaxConnections(maxConnections);

  }

  /** Monitor a port for connections. Each time one

   *  is established, pass resulting Socket to

   *  handleConnection.

   */

  public void listen() {

    int i=0;

    try {

      ServerSocket listener = new ServerSocket(port);

      Socket server;

      while((i++ < maxConnections) || (maxConnections == 0)) {

        server = listener.accept();

        handleConnection(server);

      }

    } catch (IOException ioe) {

      System.out.println("IOException: " + ioe);

      ioe.printStackTrace();

    }

  }

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