TCP robot Karel 1.9, klient + server [PSI]

package robot;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;

class Server {

    public static void svr_main(int port) throws IOException {

        ServerSocket server = null;
        try {
            server = new ServerSocket(port);
        } catch (IOException e) {
            System.err.println("Could not listen on port: " + port);
            System.exit(1);
        }
        Socket client = null;
        while (true) {
            try {
                client = server.accept();
            } catch (IOException e) {
                System.err.println("Accept failed.");
                System.exit(1);
            }
            System.out.println("Accepted client " + client.getInetAddress() + ":" + client.getPort());
            Thread t = new Thread(new ClientConn(client));
            t.start();
        }
    }
}

class ClientConn implements Runnable {

    private Socket client;
    private BufferedInputStream in = null;
    private PrintWriter out = null;
    private Random ran = new Random();
    private int x = ran.nextInt(17), y = ran.nextInt(17);
    private String name = "Hlupaku";
    private int o = ran.nextInt(4) + 1, step = 0, broken = 11;

    ClientConn(Socket client) {
        this.client = client;
        try {
            in = new BufferedInputStream(client.getInputStream());
            out = new PrintWriter(client.getOutputStream(), true);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for " + client.getInetAddress());
            return;
        }
    }

    void initCommunication() {
        if (ran.nextInt(2) == 1) {
            x *= -1;
        }
        if (ran.nextInt(2) == 1) {
            y *= -1;
        }
        out.print("210 Ahoj, jsem robot ale moc toho neumim. Oslovuj mne "
                + name
                + ". Muzeme zacit?\r\n");
        out.flush();
    }

    String readMsg(BufferedInputStream in) {
        String msg = "";
        while (!msg.endsWith("\r\n")) {
            try {
                msg += (char) in.read();

            } catch (IOException ex) {
                Logger.getLogger(ClientConn.class.getName()).log(Level.SEVERE, null, ex);
                return "";
            }
            if (msg.length() > 30) {
                msg = "";
            }
        }
        return msg;
    }

    String parseOrder(String msg) {
        try {
            if (msg.startsWith(name)
                    && (msg.substring(name.length() + 1, msg.indexOf("\r\n")).length() < 10)) {
                return msg.substring(name.length() + 1, msg.indexOf("\r\n"));
            } else {
                return "";
            }
        } catch (Exception e) {
            return "";
        }
    }

    String makeDecision(String order) {
        if ("VLEVO".equals(order)) {
            if (o == 1) {
                o = 4;
            } else {
                o--;
            }
            return "240 OK " + "(" + x + "," + y + ")\r\n";
        }
        if ("ZVEDNI".equals(order)) {
            if (x == 0 && y == 0) {
                return "260 USPECH You merely adopted beer."
                        + " I was born in it, molded by it. "
                        + "I didn’t see alcoholfree drink until I was already a man.\r\n";
            }
            return "550 NELZE ZVEDNOUT ZNACKU\r\n";
        }
        if ("KROK".equals(order)) {
            if (broken != 11) { //broken
                return "572 ROBOT SE ROZPADL\r\n";
            }
            step++;
            if (ran.nextInt(10) == 3 || step == 9) { //i am broking this time
                broken = ran.nextInt(9) + 1;
                step = 0;
                return "580 SELHANI PROCESORU " + broken + "\r\n";
            }
            //nothing broken this time
            switch (o) {
                case 1: //UP
                    y++;
                    break;
                case 2://RIGHT
                    x++;
                    break;
                case 3://DOWN
                    y--;
                    break;
                case 4://LEFT
                    x--;
                    break;
            }
            if (Math.abs(x) > 18 || Math.abs(y) > 18) {
                return "530 HAVARIE\r\n";
            }
            return "240 OK " + "(" + x + "," + y + ")\r\n";
        }
        if (order.startsWith("OPRAVIT ") && order.length() == 9) {
            if (order.substring(8, 9).equals(String.valueOf(broken))) { //repairing right proc
                broken = 11;
                return "240 OK " + "(" + x + "," + y + ")\r\n";
            }
            return "571 PROCESOR FUNGUJE\r\n";
        }
        return "500 NEZNAMY PRIKAZ\r\n";
    }

    @Override
    public void run() {
        initCommunication();
        String response = "";
        do {
            response = makeDecision(parseOrder(readMsg(in)));
            out.print(response);
            out.flush();
        } while (client.isConnected()
                && (response.startsWith("210")
                || response.startsWith("500")
                || response.startsWith("580")
                || response.startsWith("240")));
        //close session
        out.close();
        try {
            client.close();
            System.out.println("Succesfully closing session for client " + client.getInetAddress() + ":" + client.getPort());
            return;
        } catch (IOException ex) {
            Logger.getLogger(ClientConn.class.getName()).log(Level.SEVERE, null, ex);
            System.out.println("Unsuccesfully closing session for client " + client.getInetAddress() + ":" + client.getPort());
        }
        return;
    }
}

class Client {

    static String parseName(String msg) {
        String osloveni = "Oslovuj mne ";
        int nameStart = msg.indexOf(osloveni) + osloveni.length();
        int nameEnd = msg.indexOf(".", nameStart);
        return msg.substring(nameStart, nameEnd);
    }

    public static void cli_main(int port, String servername) throws IOException {
        Socket echoSocket = null;
        PrintWriter out = null;
        BufferedReader in = null;
        //init connection
        try {
            echoSocket = new Socket(servername, port);
            out = new PrintWriter(echoSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));
        } catch (UnknownHostException e) {
            System.err.println("Unknown host: " + servername);
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for " + servername);
            System.exit(1);
        }
        int code = 0, x = 0, y = 0, pX = 0, pY = 0;
        String request = "", response = "", name = "";
        while (echoSocket.isConnected() && !(code == 260 || code == 530 || code == 550 || code == 571 || code == 572)) {
            response = "";
            while (!response.endsWith("\r\n")) {
                response += (char) in.read();
            }
            //print response
            System.out.print("Receiving: " + response);
            try {
                code = Integer.parseInt(response.substring(0, 3));
            } catch (Exception e) {
                System.err.println("Recieved message without code");
                System.exit(1);
            }


            if (code == 210) {//initial communication
                System.out.println("Parsed name: " + (name = parseName(response)));
                request = name + " VLEVO\r\n";
            }
            if (code == 580) { //processor damaged
                request = name + " OPRAVIT "
                        + response.substring(response.length() - 3, response.length() - 2) //proc number
                        + "\r\n";
            }
            if (code == 240) { //OK, bot is ready
                //AI goes here
                x = Integer.parseInt(response.substring(response.indexOf("(") + 1, response.indexOf(",")));
                y = Integer.parseInt(response.substring(response.indexOf(",") + 1, response.indexOf(")")));
                if (Math.abs(y) < Math.abs(pY) || Math.abs(x) < Math.abs(pX)) { //i am closer than last time
                    request = name + " KROK\r\n";
                } else {
                    request = name + " VLEVO\r\n"; //last time i went wrong
                }
                if (x == 0 && y == 1) {
                    request = name + " VLEVO\r\n";
                }
                if (x == 0 && y == 0) { //im done
                    request = name + " ZVEDNI\r\n";
                }
                if (x == pX && y == pY) { //no move last time
                    request = name + " KROK\r\n";
                }
            }
            if (code != 260) {
                pX = x;
                pY = y;
                out.print(request); //send request to server
                out.flush(); //flush after each message
                System.out.println("sending: " + request);
            }
        }
        //end transmision
        System.out.println("\nConnection closed by foreign host: " + echoSocket.getInetAddress() + "\n");
        out.close();
        in.close();
        echoSocket.close();
    }
}

public class Robot {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        switch (args.length) {
            case 1:
                System.out.println("Starting server...\n");
                Server.svr_main(Integer.parseInt(args[0]));
                break;
            case 2:
                System.out.println("Starting client...\n");
                Client.cli_main(Integer.parseInt(args[1]), args[0]);
                break;
            default:
                System.err.println("Client: java robot.Robot <hostname> <port>");
                System.err.println("Server: java robot.Robot <port>");
                System.exit(1);
                break;
        }

    }
}