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16.12 A Debugging Web Server

427

Listing 16.9 EchoServer.java (continued)

  private int getLength(String length) {

    StringTokenizer tok = new StringTokenizer(length);

    tok.nextToken();

    return(Integer.parseInt(tok.nextToken()));

  }

}

ThreadedEchoServer

Listing 16.10 presents a multithreaded variation of the 

EchoServer

, useful

when your server needs to accept multiple simultaneous client requests. 

Listing 16.10 ThreadedEchoServer.java 

import java.net.*;

import java.io.*;

/** A multithreaded variation of EchoServer. */

public class ThreadedEchoServer extends EchoServer

                                implements Runnable {

  public static void main(String[] args) {

    int port = 8088;

    if (args.length > 0) {

      try {

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

      } catch(NumberFormatException nfe) {}

    }

    ThreadedEchoServer echoServer =

      new ThreadedEchoServer(port, 0);

    echoServer.serverName = "Threaded Echo Server";

  }

  public ThreadedEchoServer(int port, int connections) {

    super(port, connections);

  }

  /** The new version of handleConnection starts

   *  a thread. This new thread will call back to the

   *  old version of handleConnection, resulting

   *  in the same server behavior in a multithreaded

   *  version. The thread stores the Socket instance

   *  since run doesn't take any arguments, and since

   *  storing the socket in an instance variable risks

   *  having it overwritten if the next thread starts

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