Creating a client socket to test a server socket

I am having a pretty rough time testing. I'm testing a server socket and this is the code I have to test

Code snippet of class containing server socket:

PrintWriter pout = null;
String spotNumber = "";
try {
    InputStream in = theSocket.getInputStream();
    OutputStream out = theSocket.getOutputStream();

    Scanner scan = new Scanner(in);
    pout = new PrintWriter(out, true);

    spotNumber = scan.nextLine();
    System.setOut(new PrintStream(new FileOutputStream(FileDescriptor.out)));
    System.out.println(spotNumber);
    System.out.println(spotNumber);

} catch(Exception ex)
{
... other not important stuff
}

Code snippet of class creating client socket to test server socket:

String security = "security";
            try {
                Socket socket = new Socket("localhost", 3738);
                if(socket.isConnected())
                {
                    DataOutputStream writer = new DataOutputStream(socket.getOutputStream());
                    writer.writeBytes(security);
                    writer.flush();
                }
            }catch(Exception ex) {
                ex.printStackTrace();
            }

The client socket connects to the server socket, but it's not reading "security". What am I doing wrong with sending the data over the socket?