Java Klasse zum Abfragen von Server Description, Online Spieler und Maximale Spieleranzahl

Status.java

@Getter
public class Status {

    private int port;
    private String host;
    private int players;
    private int maxPlayers;
    private String description;

    public Status( String host, int port ) throws IOException {
        this.port = port;
        this.host = host;
        rescann();
    }

    private void rescann() throws IOException {
        Socket socket = new Socket(host, 25565);
        DataOutputStream out = new DataOutputStream(socket.getOutputStream());
        DataInputStream in = new DataInputStream(socket.getInputStream());

        out.write(hexStringToByteArray("FE"));

        byte[] b = new byte[241];
        in.read(b, 0, 241);
        StringBuffer buffer = new StringBuffer();
        for (int i = 4; i < b.length; i++) {
            if (b[i] != 0) {
                buffer.append((char) b[i]);
            }
        }


        String[] split = buffer.toString().split(String.valueOf((char) -89));

        description = split[0];
        players = Integer.parseInt( split[1] );
        maxPlayers = Integer.parseInt( split[2] );
        out.close();
        in.close();
        socket.close();

    }

    private static byte[] hexStringToByteArray(String s) {
        int len = s.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
        }
        return data;
    }
}