echoserver3.java

JAVA分布式程序学习的课件（全英文）

import java.io.*;
import java.net.*;

/**
 * This module contains the application logic of an echo server
 * which uses a stream-mode socket for interprocess communication.
 * Unlike EchoServer2, this server services clients concurrently.
 * A command-line argument is required to specify the server port.
 * @author M. L. Liu
 */

public class EchoServer3 {
   public static void main(String[] args) {
      int serverPort = 7;    // default port
      String message;

      if (args.length == 1 )
         serverPort = Integer.parseInt(args[0]);       
      try {
         // instantiates a stream socket for accepting
         //   connections
   	   ServerSocket myConnectionSocket = 
            new ServerSocket(serverPort); 
/**/     System.out.println("Echo server ready.");  
         while (true) {  // forever loop
            // wait to accept a connection 
/**/        System.out.println("Waiting for a connection.");
            MyStreamSocket myDataSocket = new MyStreamSocket
                (myConnectionSocket.accept( ));
/**/        System.out.println("connection accepted");
            // Start a thread to handle this client's sesson
            Thread theThread = 
               new Thread(new EchoServerThread(myDataSocket));
            theThread.start();
            // and go on to the next client
            } //end while forever
       } // end try
	    catch (Exception ex) {
          ex.printStackTrace( );
	    } // end catch
   } //end main
} // end class