4 Replies Latest reply on Oct 27, 2004 8:04 AM by poojac20

    Posting Again: Can Servlet automatically listen to user-spec

    poojac20
    poojac20 Oct 25, 2004 3:21 PM

      Sorry for cluttering the forum. I've already asked this question but without an answer. Hence posting again with more clarity.

      Is it possible to configure my servlet in such a way that it listens to a particular port, Say 7001?

      I want my clients to access this servlet NOT thru HTTP request to jboss port 8080 but by posting bytes directly on 7001. The client only knows IP address & port number of the host and has no knowledge of servlet existence. It only knows to send bytes in a particular order on an IP and its particular port. I need JBoss to route all requests on this port to my servlet - and handle multiple requests in the process.

      Will I need to write a separate redirector which listens on the port, wraps these bytes in HTTP and sends them to the servlet ? [And hence get into the mess of managing threads for mutliple clients and sockets]


      Or is it possible to route everything on 7001 to my servlet automatically?

      Thanx for ne insight

      --- Pooja.

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        • 1. Re: Posting Again: Can Servlet automatically listen to user-
          robisz
          robisz Oct 26, 2004 6:10 AM (in response to poojac20)

          You can configure a connector on port 7001.
          Check your_jboss_conf/deploy/jbossweb-tomcat50.sar/server.xml.

          But if you want to use HttpServlet you must access it through
          http protocol, of course. But it can't be a problem. See URL and
          HttpURLConnection classes in J2SE API documentation.

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          • 2. Re: Posting Again: Can Servlet automatically listen to user-
            poojac20
            poojac20 Oct 27, 2004 2:10 AM (in response to poojac20)

            Thanx robisz.

            Understood this connector thing now.

            But about using HttpURLConnection, in my case, this will not be possible - my client is a pos terminal which dials on to a modem and which then passes on to some server's specific port. Including a URL is not possible in this scenario.

            I am trying this out - do u think if I extend GenericServlet and write something on my own, that may help - will i still need to access the servlet through some URL? Or I can then expect an automatic call to my process function?

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            • 3. Re: Posting Again: Can Servlet automatically listen to user-
              robisz
              robisz Oct 27, 2004 3:16 AM (in response to poojac20)

              It's possible to write non-http servlet, but you need an
              appropriate servlet container that can handle it.

              Are you sure you want to use J2EE?

              As I see, all you need is a plain TCP/IP socket.

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              • 4. Re: Posting Again: Can Servlet automatically listen to user-
                poojac20
                poojac20 Oct 27, 2004 8:04 AM (in response to poojac20)


                Actually, I have most of the business logic already available as EJBs.
                Hence J2ee as back end is already there.

                I need to use these EJBs and am trying to avoid RMI calls through another home-made server.
                And then I also thought IF JBoss can manage multiple sockets/threads/clients on its own , then I can avoid this work.

                It seems Connector can achieve this multiple socket management .. am i right? So the next question is can a servlet (or something else from which I can call EJBs) be automatically called by the container when request comes on a certain port?

                Thanx for the help.

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