SERVER


package server;
import java.io.*;
import java.net.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Server {

    ServerSocket server;
    Socket socket;
    int porta;
    DataInputStream in;
    DataOutputStream out;

    public Server() throws Exception  {
        try {

            server = new ServerSocket(7777);
        } catch (Exception e) {
            System.err.println ("[#] Server non creato ");
        }
        System.out.println ("[#] Server creato");
        socket = server.accept();



    }
    public void comunica() throws Exception {
        in = new DataInputStream(socket.getInputStream());
        out = new DataOutputStream(socket.getOutputStream());
        try {
        System.out.println ("Messaggio: ");
        String messaggioLetto = in.readLine();
        System.out.println ("Messaggio ricevuto: "+ messaggioLetto);
        System.out.println ("Rispondo con:  "+messaggioLetto);
        out.writeBytes(messaggioLetto+"\n"); // Inviamo il messaggio
        } catch(IOException e ) {
            e.printStackTrace();
        }

    }
    public void chiudi () {
        try {
            socket.close();
        } catch (IOException ex) {
            Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public static void main(String[] args) {
        Server server=null;
        try {
            server = new Server();
        } catch (Exception ex) {
            Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
        }
        try {
            server.comunica();
        } catch (Exception ex) {
            Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
        }
        server.chiudi();
    }



}






CLIENT

package client;
import java.io.*;
import java.net.*;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Client {

    Socket client;
    DataInputStream in;
    DataOutputStream out;
    BufferedReader input = new BufferedReader (new InputStreamReader(System.in));
    public Client() throws IOException {
        try {
            client = new Socket(InetAddress.getLocalHost(),7777);
        } catch (Exception e) {
            System.err.println("[#]Client non connesso");
        }
        System.out.println ("[#]Client connesso");

        client.close();
    }
    public void comunica() throws IOException {

        System.out.println ("Messaggio da inviare: ");
        String messaggio = input.readLine();
        out.writeBytes(messaggio+ "/n");
        String ricevuto = in.readLine();
        System.out.println ("Messaggio ricevuto: "+ricevuto);
    }

    public static void main(String[] args) throws Exception {

        Client client = new Client();
        client.comunica();


    }

}