How to invoke a servlet from an application-URGENT

Question

Hi,
          My requirement is as follows :
          I have to invoke a servlet from a client application. I am using
          java.net.URL and java.netURLConnection classes to
          open a connection and invoke the servlet.
          I am using WebLogic5.1
          my code snippet is as follows :
          URL url = new URL("http://localhost:7001/urlservlet");
          URLConnection connection = url.openConnection();
          connection.setRequestMethod("GET");
          connection.setDoOutput(true);
          connection.setDoInput(true);
          PrintStream outStream = new PrintStream( connection.getOutputStream() );
          outStream.print("message=hai");
          outStream.flush();
          outStream.close();
          When I execute the application, Webloigc server console is displaying the
          following line.
          <Listen Thread> Adding Address : <machine name><ip address>
          But the service method of servlet is not getting invoked at all.
          Help me to find the answer.
          Jeelani
          

Answer 1

jeelani <[email protected]> wrote:
          > Hi Dimitri,
          > Thanks a lot.That worked for me.
          > But if I want to send java objects (Vectors,beans),what is the best way to
          > do it.
          > This is exactly what our requirement is..
          If you want to send Java object you have to use POST:
          URLConnection conn = ...
          conn.setDoOutput(true); // makes this a POST
          OutputStream os = conn.getOutputStream();
          ...write your objects here...
          os.flush();
          os.close();
          InputStream in = conn.getInputStream(); // sends data to the server and
          // opens input stream
          ..read servlet response..
          .. ot just close the stream...
          in.close();
          > my client application need to send some java components to our main server
          > located in our head office.The servlet will read the objects and execute the
          > functionality..
          > I really appreciate for the fast response from you.
          > Dimitri Rakitine <[email protected]> wrote in message
          > news:[email protected]...
          >> Try it like this:
          >>
          >> URL url = new URL("http://localhost:7001/urlservlet?message=hai");
          >> URLConnection connection = url.openConnection();
          >> InputStream in = connection.getInputStream();
          >> in.close();
          >>
          >>
          >> jeelani <[email protected]> wrote:
          >> > Thanks for the quick response.
          >>
          >> > Actually right now it doesn't matter whether it is by GET or by POST.
          >> > Add my clinet application just needs to send data to Servlet and nothing
          > to
          >> > get in return.Thats why I am using connection.getOutputStream().
          >>
          >> > since application will not be reading anything from servlet, I don't
          >> > think it is required to use connection.getInputStream().
          >> > (I am sorry, if I am wrong).
          >>
          >> > Can you please help me out. weblogic server is able to get the address
          >> > from where the request is coming. Only problem is servlet is not getting
          >> > invoked.
          >>
          >> > regards,
          >> > Jeelani
          >>
          >>
          >> > Dimitri Rakitine <[email protected]> wrote in message
          >> > news:[email protected]...
          >> >> Are you trying to do get or post? First you set method to GET
          >> >> and then you do the POST.
          >> >>
          >> >> And add InputStream is = connection.getInputStream() - that will
          >> >> result in HttpURLConnection sending data to the server and getting
          >> >> back the response.
          >> >>
          >> >> jeelani <[email protected]> wrote:
          >> >> > Hi,
          >> >>
          >> >> > My requirement is as follows :
          >> >>
          >> >> > I have to invoke a servlet from a client application. I am using
          >> >> > java.net.URL and java.netURLConnection classes to
          >> >> > open a connection and invoke the servlet.
          >> >>
          >> >> > I am using WebLogic5.1
          >> >>
          >> >> > my code snippet is as follows :
          >> >>
          >> >> > URL url = new URL("http://localhost:7001/urlservlet");
          >> >>
          >> >> > URLConnection connection = url.openConnection();
          >> >>
          >> >> > connection.setRequestMethod("GET");
          >> >> > connection.setDoOutput(true);
          >>
          >> >> > PrintStream outStream = new
          >> > PrintStream( connection.getOutputStream() );
          >> >> > outStream.print("message=hai");
          >> >> > outStream.flush();
          >> >> > outStream.close();
          >> >>
          >> >> > When I execute the application, Webloigc server console is displaying
          >> > the
          >> >> > following line.
          >> >>
          >> >> > <Listen Thread> Adding Address : <machine name><ip address>
          >> >>
          >> >> > But the service method of servlet is not getting invoked at all.
          >> >>
          >> >> > Help me to find the answer.
          >> >>
          >> >> > Jeelani
          >> >>
          >> >> --
          >> >> Dimitri
          >> >> http://dima.dhs.org
          >>
          >>
          >>
          >> --
          >> Dimitri
          >> http://dima.dhs.org
          Dimitri
          http://dima.dhs.org