Java TCP 客户端/服务器

Question

I have a problem which I do not know how to proceed further in Java TCP socket issue. So far as what we can get from the Internet, it's not hard to get quite a number of working solution for TCP server & client communication in Java. However, most of the example will have their server listen to a port, and then loop until they get a client which connects to the server, then the code will perform server.accept() and move further. For example:

 public static void main(String[] args) throws IOException {
    ServerSocket s = new ServerSocket(PORT);
    System.out.println("Started: " + s);
    try {
      // Blocks until a connection occurs:
      Socket socket = s.accept();
      try {
        System.out.println("Connection accepted: "+ socket);

It will work perfectly if there's a client connecting to the server. And, my problem is that I need to continue some other procedures even though there's no client connecting to the server. In fact, I will need to launch another JFrame to continue the procedures even if there is no client connecting to the same port and ip. However, I have been struggling but as long as there is not client connecting to the server, my Java program will hang there with white popped up JFrame.

I would need to know how to overcome this as I am not quite sure whether there's a mistake in my understanding. Please assist and advice. Thank you!

Best Regards, Yi Ying

Answer 1

Sounds like you need to do work in one thread whilst waiting for network connections on another. Check out the threading tutorial . Note that since you're using Swing, you have to be careful wrt. which thread will modify your JFrame etc. and you should be aware of the SwingWorker utility.