chat

package cviko1A;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ChatServer {

    public static void main(String[] args) {
        try (ServerSocket ss = new ServerSocket(9000)) {
            ExecutorService es = Executors.newCachedThreadPool();

            while (true) {
                Socket s = ss.accept();
                ChatTask task = new ChatTask(s);
                es.execute(task);
            }

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}
=========================================================
package cviko1A;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;

public class ChatTask implements Runnable {

    private Socket s;

    public ChatTask(Socket s) {
        this.s = s;
    }

    @Override
    public void run() {
        InputStream is;
        try {
            is = s.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);

            String line;
            do {
                line = br.readLine();
                System.out.println(s.getInetAddress() + ": " + line);
            } while (line != null);

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                s.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

}
================================================
package cviko1A;

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

public class ChatClient {

    public static void main(String[] args) {
        try (Socket socket = new Socket("158.197.35.78", 9000)) {
            OutputStream os = socket.getOutputStream();
            PrintWriter pw = new PrintWriter(os);

            Scanner scanner = new Scanner(System.in);
            while (true) {
                pw.println(scanner.nextLine());
                pw.flush();
            }

        } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}