YamashitaDeMouraTcpServer.java

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

/**
 * MV3500
 * 
 * TCP Server.
 * This server works with only one client and can exchange
 * multiples messages with it.
 * 
 * @author Douglas Yamashita de Moura
 * @version 20180212
 * 
 */
public class YamashitaDeMouraTcpServer 
{

    public static void main(String[] args) 
    {
        try
        {   
            ServerSocket serverSocket = new ServerSocket(2317);
            System.out.print("Server socket created. Waiting for client...\n");

            Socket clientConnection = serverSocket.accept();

            InetAddress localAddress = clientConnection.getLocalAddress();
            InetAddress remoteAddress = clientConnection.getInetAddress();

            int localPort = clientConnection.getLocalPort();
            int remotePort = clientConnection.getPort();

             System.out.println("Socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( " + 
                    remoteAddress.toString() + ", " + remotePort + " ))\n");

            int count = 1;
            boolean openConnection = true;
            
            while(openConnection)
            {                
                String response = "";

                System.out.println("Request #" + count);

                // Receives message from client
                InputStream is = clientConnection.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);
                String clientMessage = br.readLine();
                System.out.println("The message the client sent was: " + clientMessage + ".");

                // Sends message to client 
                OutputStream os = clientConnection.getOutputStream();        
                PrintStream ps = new PrintStream(os);

                switch (count){

                    case 1:
                        response = "'I am the server and I accepted the request. Send entity name and position.'\n";
                        break;
                    case 2:
                        response = "'I confirm the receipt of the message.'\n";
                        break;
                    case 3:
                        response = "'You are welcome. Closing connection.'\n";
                        openConnection = false;
                        break;
                }

                System.out.println("Message sent to client: " + response);
                ps.print(response);
                ps.flush();
                response = "";
                count++;

            }
            clientConnection.close();
        } catch(Exception e){
            System.out.println("Problem with networking");
            System.out.println("Exception: " + e);
        }        
    }
    
}