This program implements a simple server that listens to port 8189 and echoes back all client input. : ServerSocket « Network Protocol « Java





This program implements a simple server that listens to port 8189 and echoes back all client input.

  
/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * This program implements a simple server that listens to port 8189 and echoes back all client
 * input.
 * @version 1.20 2004-08-03
 * @author Cay Horstmann
 */
public class EchoServer
{
   public static void main(String[] args)
   {
      try
      {
         // establish server socket
         ServerSocket s = new ServerSocket(8189);

         // wait for client connection
         Socket incoming = s.accept();
         try
         {
            InputStream inStream = incoming.getInputStream();
            OutputStream outStream = incoming.getOutputStream();

            Scanner in = new Scanner(inStream);
            PrintWriter out = new PrintWriter(outStream, true /* autoFlush */);

            out.println("Hello! Enter BYE to exit.");

            // echo client input
            boolean done = false;
            while (!done && in.hasNextLine())
            {
               String line = in.nextLine();
               out.println("Echo: " + line);
               if (line.trim().equals("BYE")) done = true;
            }
         }
         finally
         {
            incoming.close();
         }
      }
      catch (IOException e)
      {
         e.printStackTrace();
      }
   }
}

   
    
  










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