Client/Server GUI hanging up - Brocard's Problem - Running multiple client threads

[Rick Wallace]

I've created a server and client class along with a GUI which tests out Brown numbers (solutions to Brocard's problem, n! + 1 = m^2). I am testing every value of n starting at 1 up to and beyond 10^9. I connect to the server but when I press the client thread 'Start Client" button the program begins the computations but the GUI hangs up and the button stays depressed. My goal is to have the output from the computations displayed in a TextField and also be able to start up more than 1 client thread and have each running it's own computations and displaying the results on separate windows. The code below does not include the code for the computations but just echos back "Welcome to Java based Server". But if I can get this to be displayed without the GUI hanging up that'd be great.

Any suggestions?

   
package client;

imports...

public class ClientThread extends Observable implements Runnable {
/** For reading input from socket */
private BufferedReader br;

/** For writing output to socket. */
private PrintWriter pw;

/** Socket object representing client connection */

private Socket socket;
private boolean running;

private final static BigInteger one = new BigInteger("1");
private final static BigInteger two = new BigInteger("2");

ClientWindow clientWindow;

public ClientThread(Socket socket) throws IOException {
this.socket = socket;
running = false;
//get I/O from socket
try {
pw = new PrintWriter(socket.getOutputStream(),
true);
br = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
running = true; //set status
}
catch (IOException ioe) {
throw ioe;
}
}

public void startClient() throws IOException{
try {
//Socket socket = new Socket("localhost", 11327);
ClientThread myClientThread = new ClientThread(socket);
myClientThread.run();
} catch (UnknownHostException e) {
System.out.print("Exception: " + e);
}
}

/**
*Stops clients connection
*/

public void stopClient() {
try {
this.socket.close();
} catch (IOException ioe) {};
}

public void run() {
clientWindow = new ClientWindow();
ClientWindow.addWindow();
String msg = ""; // will hold message sent from client
ClientWindow.getJTextArea().setText("Welcome to Java based Server");
pw.println("Welcome to Java based Server");

// start listening message from client//

try {
String fromServer = "";
while ((msg = br.readLine()) != null && running) {
// provide your server's logic here//
fromServer = msg;
System.out.println("Server: " + fromServer);
// right now it is acting as an ECHO server//

pw.println(msg); // echo msg back to client//
ClientWindow.getJTextArea().setText(msg);
}
running = false;
} catch (IOException ioe) {
running = false;
}
// it's time to close the socket
try {
this.socket.close();
System.out.println("Closing connection");
} catch (IOException ioe) {
}

// notify the observers for cleanup etc.
this.setChanged(); // inherit from Observable
this.notifyObservers(this); // inherit from Observable
}

public static void main(String args[]) throws UnknownHostException, IOException{

Socket socket = new Socket("localhost", 11327);
ClientThread myClientThread = new ClientThread(socket);
myClientThread.startClient();

}
}

Thank you

[Rob Spoor]

Check out this page.

[Rick Wallace]

Perfect. Thanks!