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EJB and other Jakarta /Java EE Technologies

client or consumer register listner?

Samanthi perera

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Posts: 510

posted 14 years ago

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this is my servlet

package MyMdb;

import java.io.IOException;
import java.io.PrintWriter;
import javax.jms.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class sendMessage extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        //start the jms stuff

try{
            Context ctx = new InitialContext();
            ConnectionFactory     connectionFactory = (ConnectionFactory)ctx.lookup("jms/tConnectionFactory");
            Queue     queue = (Queue)ctx.lookup("jms/tQueue");
            javax.jms.Connection  connection = connectionFactory.createConnection();
            javax.jms.Session        session = connection.createSession(false,Session.AUTO_ACKNOWLEDGE);
            MessageProducer messageProducer = session.createProducer(queue);
            TextMessage message = session.createTextMessage();
            message.setText(request.getParameter("message"));
            System.out.println( "It come from Servlet:"+ message.getText());
            messageProducer.send(message);

//message sent , it was all

//show what we have done in this servlet
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet sendMessage</title>");
            out.println("</head>");
            out.println("<body>");
            out.println("<center>");
            out.print("Servlet Send this message <h2>"+request.getParameter("message") + "</h2>  to this Queue : <h2>"+queue.getQueueName()+"</h2>");
            out.println("</center>");
            out.println("</body>");
            out.println("</html>");

} catch(Exception ex){
            ex.printStackTrace();
        }

out.close();
    }

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

/** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

/** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}

thsi is my message consumer

package mdbs;

import javax.annotation.Resource;
import javax.ejb.ActivationConfigProperty;
import javax.ejb.MessageDriven;
import javax.ejb.MessageDrivenContext;
import javax.jms.*;

@MessageDriven(mappedName = "jms/tQueue", activationConfig = {
    @ActivationConfigProperty(propertyName = "acknowledgeMode", propertyValue = "Auto-acknowledge"),
    @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue")
})
public class TMDBBean implements MessageListener {

public TMDBBean() {
    }

@Resource
    private MessageDrivenContext mdc;
    public void onMessage(Message message) {

TextMessage msg = null;
        try {
            if (message instanceof TextMessage) {
                msg = (TextMessage) message;
                System.out.println("A Message received in TMDB: " +
                        msg.getText());
            } else {
                System.out.println("Message of wrong type: " +
                        message.getClass().getName());

}
        } catch (JMSException e) {
            e.printStackTrace();
            mdc.setRollbackOnly();
        } catch (Throwable te) {
            te.printStackTrace();
        }

}
}

this is working.Anyway i found in sun site this

nyway my client(Servlet) is not register with listner.
But my consumer TMDBBean register listner?

ramprasad madathil

Ranch Hand

Posts: 489

I like...

posted 14 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

nyway my client(Servlet) is not register with listner.
But my consumer TMDBBean register listner?

Yes, your servlet posts the message. And your TMDBBean listens for the message (is the message listener).

ram.

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