Step2ClientSocketHandlerTCP.java

package ar.com.javacuriosities.networking.tcp.handler;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;

public class Step2ClientSocketHandlerTCP {

    public static void main(String[] args) throws IOException {
        // Creamos un Socket que va a enviar datos al puerto 4444
        Socket socketToConnect = new Socket(InetAddress.getLocalHost(), 4444);
        
        // Usamos un PrintWriter para enviar datos, o sea usaremos un stream de caracteres
        PrintWriter socketOutput = new PrintWriter(socketToConnect.getOutputStream(), true);
        
        // Buffer de lectura del server
        BufferedReader socketInput = new BufferedReader(new InputStreamReader(socketToConnect.getInputStream()));

        // Buffer de lectura para la entrada de comandos
        BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));
        String fromUser;
        String fromServer;
        
        /*
         * Verificamos contra null porque si cierran el buffer recibimos un NULL como lectura
         */
        while ((fromServer = socketInput.readLine()) != null) {
            System.out.println("Server: " + fromServer);
            if (fromServer.equals("Bye")) {
                break;
            }

            fromUser = userInput.readLine();
            if (fromUser != null) {
                System.out.println("Client: " + fromUser);
                socketOutput.println(fromUser);
            }
        }

        socketOutput.close();
        socketInput.close();
        userInput.close();
        socketToConnect.close();
    }
}