A simple server with which you can interact over a raw socket.

SimpleServer.java

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketTimeoutException;

/**
 * A simple server with which you can interact over a raw socket.
 */
public class SimpleServer {

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

        final int TIMEOUT = 3000;
        final int PORT = 9292;

        ServerSocket server = new ServerSocket(PORT);
        server.setSoTimeout(TIMEOUT);
        Socket connection = null;

        boolean stillRunning = true;
        try {
            while(stillRunning) {
                try {

                    System.out.println("Waiting for a connection on port " + PORT + "...");
                    connection = server.accept();
                    System.out.println("Received connection!");

                    stillRunning = handleUserSession(connection);

                    connection.close();

                } catch (SocketTimeoutException e) {
                    if(Thread.currentThread().isInterrupted()) {
                        System.err.println("Shutdown requested...exiting");
                        stillRunning = false;
                    }
                }
            }
        } finally {
            if(connection != null) connection.close();
        }
    }

    private static boolean handleUserSession(Socket connection) throws IOException {

        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        BufferedWriter writer =  new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));

        boolean userLoggedOn = true;
        boolean serverShouldBeRunning = true;

        while(userLoggedOn) {

            writer.write("Ready for command:");
            writer.newLine();
            writer.flush();

            String command = reader.readLine();

            if("shutdown".equals(command)) {
                System.out.println("Received shutdown command!");
                writer.write("** SHUTTING DOWN SERVER IMMEDIATELY");
                writer.newLine();
                userLoggedOn = false;
                serverShouldBeRunning = false;

            } else if ("goodbye".equals(command)) {
                System.out.println("User logoff");
                writer.write("Goodbye!");
                writer.newLine();
                userLoggedOn = false;

            } else {
                System.out.println("Received command: " + command);
                writer.write("Received command: '" + command + "'");
                writer.newLine();
            }

            writer.flush();
        }

        return serverShouldBeRunning;
    }
}