Question

I am making a java applet that has basic chat functionality (you can send/recieve messages). I have made a separate thread to handle the connection on the client version, and the server also makes a thread for every connected client.

in the run() method of the client i have a while loop to read any messages recieved:

while (state == ConnectionState.CONNECTED) {
   out.println("Hello Server");
   out.flush();
   String input = in.readLine();
   System.out.println(input);
   if(input == null){
      connectionClosedFromOtherSide();
   }
   else {
      received(input);
      System.out.println(String.format("Recieved something: %s", input));
   }
}

Here out is my PrintWriter and in my BufferedReader. For debugging purposes I put the ‘hello server’ here. This code works fine, but the problem is the sendtext() method:

synchronized private void sendText(String tosend) {
   if(out != null && state == ConnectionState.CONNECTED){
      out.print(tosend);
      out.flush();
      System.out.println(String.format("sending %s to server", tosend));
   }
}

For some reason, if i call this method, it isn’t recieved on the server side. (however the console does show that it is sent)

Can anyone please help me out with this?

Answer 1

Client side, each

String input = in.readLine(); // read until newline

should be, on server side, balanced by

out.println( tosend ); // print the newline expected by the client

out.flush() don’t send a newline.