public class ClockSkewServer {
public static void main (String args[]){
    try {
        ServerSocket s = new ServerSocket(3000);
        System.out.println("Server is listening!");
        Socket connection = s.accept();
        connection.setKeepAlive(true);
        BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        PrintWriter pw = new PrintWriter(connection.getOutputStream(), true);
        while (true) {

            String message = br.readLine();
            System.out.println(message);
            Long receivedTime = ByteUtil.stringToLong(message);
            System.out.println(receivedTime);



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


}
    }

public class ClockSkewClient {
public static void main (String args[]) throws UnknownHostException, IOException, InterruptedException{
    Socket s1 = new Socket(args[0], 3000);
    s1.setKeepAlive(true);
    PrintWriter out1 = new PrintWriter(s1.getOutputStream(), true);
    long l = new Long("1490917469228");
    //System.out.println(l);
    while (true){
        Thread.sleep(1000);
        String message  = ByteUtil.longToString(l);
        System.out.println("Client message: " + message);
        System.out.println(ByteUtil.stringToLong(message));
        out1.println(message);
    }

}
}

public class ByteUtil {
    private static ByteBuffer longBuffer = ByteBuffer.allocate(Long.BYTES);
    private static ByteBuffer shortBuffer = ByteBuffer.allocate(Short.BYTES);
    private static ByteBuffer byteBuffer = ByteBuffer.allocate(Byte.BYTES);

    public static byte[] longToBytes(long x) {
        longBuffer.putLong(0, x);
        return longBuffer.array();
    }

    public static long bytesToLong(byte[] bytes) {
        return ByteBuffer.wrap(bytes).getLong();
    }


    public static String longToString (long x) throws UnsupportedEncodingException{
        return new String (longToBytes(x), "ISO-8859-1");
    }

    public static long stringToLong (String s) throws UnsupportedEncodingException{
        return bytesToLong(s.getBytes("ISO-8859-1"));
    }




}