I want to receive and send data in ASCII how can I do? (Have the code)

Question

I use my program connect to server (the server is .exe file) after I connect in ms-dos mode I want to send the command from client to server but nothing is happen such as I want to send MOVE 50 it means move 50cm nothing is back(may be because I haven't convert it to ASCII first) How can I change mycode to read and wrtie ASCII code?
public class proxy_server {
    /** Creates a new instance of proxy_server */
    public static void main(String args[]) throws IOException {
            Socket sock=null;
            PrintWriter out=null;
            BufferedReader in=null;
            sock = new Socket("localhost", 3000);
            out=new PrintWriter(sock.getOutputStream(),true);
            in=new BufferedReader(new InputStreamReader(sock.getInputStream()));
            BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
            String userInput;
            while(( stdIn.readLine()!=null)){
                userInput=stdIn.readLine();
                out.println(userInput);
                System.out.println("echo"+in.readLine());
            out.close();
            in.close();
            stdIn.close();
            sock.close();
}

Answer 1

we usually should use a blank-line-check as an exit condition.Certainy not 'usually'. See below.
I was just talking about a primitive stdin input on
console.But nobody else was, especially the OP.
Simple null check on readLine while loop often causes
confusion among Java newbies becuase they can't exit
the program.
If and only if you define your operating instructions so that pressing ENTER is the way to exit the program, you would include the blank line check. Not otherwise, and certainly not 'usually'.
Otherwise they can always type Ctrl/Z or Ctrl/D to exit the program. And that's the correct way to clear up the confusion. Terminating the loop on a blank line just adds to the confusion