HELP - Problem in running a servlet

Question

I have developed an application of internet payment gateway(IPG). The application architecture is a cardholder visits a shoping cart and from the payment page he fill out his payment information such as credit card number, amout etc. on submit this payment form frowards a request to a merchant payment servlet that recieve the request, perform some action on it and forwards a request to the IPG. The IPG servlet receives the merchant servlet request and forward to a switch. Switch performs tranasction and replies back to the IPG servlet and then IPG servlet will response back to the merchant servlet about the transaction response.
The IPG is connected each time with switch on specific IP and Port which is predefined in switch for this IPG and this is only 1 IP and 1 port assigned to this IPG. When IPG servlet completes the transaction request now it is disconnected with Switch.
My issue is when 2 or more transaction request are generated at the same time the IPG servlet processes each request separate in a servlet (as i understand) but due to only 1 IP and Port is assigned to the IPG, the IPG can connect only one time with the switch and if IPG is connected then other requests can not processed by IPG because second and so on request are unable to connect with switch on the same IP and Port when for the first reuest IPG is already connected on this IP and Port.
I have successfully implemented this modal in a desktop application which can handles multiple request on the same IP and Port at a time.
Is there any possibility in servlets that IPG servlet will connects only one time with switch on IP and Port when i started the web server and all request in IPG uses the same channel to forward request to switch and recieve response from the switch.
I will be very very thankfull if anyone will solve my problem because my 3 clients are waiting for my application and i have in trouble to solve the problem.
IT IS A HUMBLE REQUEST AND HOPE YOU WILL REPLY AS SOON AS POSSIBLE.
Thanks
Wajid Hussain

Answer 1

Your piece code seems fine but just make sure that your switch is as below
Have ReaderThread class implementing Runnable
In your main program create a server socket (in main method or whereever)
ServerSocket listener = new ServerSocket(Integer.parseInt(host.getARValuePort()));now
while(true){
  Socket socket = listener.accept();
  // after this instantiate ReaderThread as below
  ReaderThread theThread = new ReaderThread (socket);
// Start the thread with this ReaderThread object as below
       Thread t = new Thread(theThread);
        t.start();
}Now ReaderThread is as below
class ReaderThread implements Runnable{
         private Socket server;
             ReaderThread (Socket server) {
                  this.server=server;
        public void run () {
            // Here play around with your socket to read write or what ever and close.
            DataInputStream in = new DataInputStream (server.getInputStream());
            PrintStream out = new PrintStream(server.getOutputStream());              
}Hope the above steps should solve your problem.