Server on your own computer

(lab 3 - Rock-Paper-Scissors)

The program of lab 3 connects to a server. Here is the server program. If the server is not running, you can run it locally, i.e. on your own computer.

Server

If you want to run your own server, just save the code above to your own account. Compile and run the server like this:

javac Server4712.java
java Server4712

In some of the lab rooms, all students use the same computer. This may cause problems for the Rock-paper-scissors-server. Only one program at a time may use a particular port. If another student is already running the program using e.g. port 4712, your server program cannot use that port. It is possible for you to use the other students' server but a problem with this is that you don't know when this server shuts down. A more reliable solution for you is to use a port number of your own for your server. If you wish to do this, change "4712" to another number in the following line of code:

ServerSocket sock = new ServerSocket(4712,100);

ServerSocket sock = new ServerSocket(1717,100);

Klient

When you want to play with a server on your own computer, some changes in the client are also required. The code to connect to the server looks essentially like this:

  try {
     Socket socket=new Socket("my.nada.kth.se",4712) ;
     BufferedReader in=new BufferedReader(new InputStreamReader(
                           socket.getInputStream()));
     PrintWriter ut=new PrintWriter(socket.getOutputStream());
     ut.println("Charlotta"); ut.flush();
     System.out.println(in.readLine());
  }

  try {
     Socket socket=new Socket("localhost",1717);
     BufferedReader in=new BufferedReader(new InputStreamReader(
                           socket.getInputStream()));
     PrintWriter ut=new PrintWriter(socket.getOutputStream());
     ut.println("Charlotta"); ut.flush();
     System.out.println(in.readLine());
  }