JAVA - Socket.accept () freezes ui

Question

I am trying to make a multi-threaded server / client application with java! this code is for the listen () method in a package class called Bsocket (iserver.core.socket):

try { serverSocket = new ServerSocket(port); }catch(IOException e ){ ui.log(e.toString());//* } while (true){ try{ clienSocket = serverSocket.accept(); ui.log("Incomming Connection.");//* new connectionHandler(clienSocket, ui); }catch(IOException e ){ ui.log(e.toString()); } } 

ui.log("Incomming Connection."); is the method below the main Bgui class (iserver.core.ui). Bgui is a jframe that contains a text field and something else! the problem is when the executable methods accept, ui.log does not work! What is wrong here?

Answer 1

You need to separate user interface threads from your own network service threads. accept () blocks (obviously) and freezes your application until you get a new client, and freezes again, expecting more clients.

Answer 2

You will need to start your server in a separate thread, since .accept is a blocking call. You might want to do something like this:

 (new Runnable() { @Override public void run() { try { serverSocket = new ServerSocket(port); }catch(IOException e ){ ui.log(e.toString());//* } while (true){ try{ clienSocket = serverSocket.accept(); ui.log("Incomming Connection.");//* new connectionHandler(clienSocket, ui); }catch(IOException e ){ ui.log(e.toString()); } } } }).start(); 

NOTE. This code has not been verified, but it should give you an idea of ​​what you need to do.

Answer 3

Socket.accept() blocks until an incoming connection is received (see the documentation). You should not block calls from the user interface thread, otherwise it will be ... you know ... block!