HelloWorldMDBServletClient.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
 * contributors by the @authors tag. See the copyright.txt in the
 * distribution for a full listing of individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.as.quickstarts.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.annotation.Resource;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * <p>
 * A simple servlet 3 as client that sends several messages to a queue or a topic.
 * </p>
 * 
 * <p>
 * The servlet is registered and mapped to /HelloWorldMDBServletClient using the {@linkplain WebServlet
 * @HttpServlet}.
 * </p>
 * 
 * @author Serge Pagop (spagop@redhat.com)
 * 
 */
@WebServlet("/HelloWorldMDBServletClient")
public class HelloWorldMDBServletClient extends HttpServlet {

    private static final long serialVersionUID = -8314035702649252239L;

    private static final int MSG_COUNT = 5;

    @Resource(mappedName = "java:/ConnectionFactory")
    private ConnectionFactory connectionFactory;

    @Resource(mappedName = "java:/queue/HELLOWORLDMDBQueue")
    private Queue queue;

    @Resource(mappedName = "java:/topic/HELLOWORLDMDBTopic")
    private Topic topic;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html");
        PrintWriter out = resp.getWriter();
        Connection connection = null;
        out.write("<h1>Quickstart: Example demonstrates the use of <strong>JMS 1.1</strong> and <strong>EJB 3.1 Message-Driven Bean</strong> in JBoss Enterprise Application 6 or JBoss AS 7.1.0.</h1>");
        try {
            Destination destination;
            if (req.getParameterMap().keySet().contains("topic")) {
                destination = topic;
            } else {
                destination = queue;
            }
            out.write("<p>Sending messages to <em>" + destination + "</em></p>");
            connection = connectionFactory.createConnection();
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageProducer messageProducer = session.createProducer(destination);
            connection.start();
            out.write("<h2>Following messages will be send to the destination:</h2>");
            TextMessage message = session.createTextMessage();
            for (int i = 0; i < MSG_COUNT; i++) {
                message.setText("This is message " + (i + 1));
                messageProducer.send(message);
                out.write("Message (" + i + "): " + message.getText() + "</br>");
            }
            out.write("<p><i>Go to your JBoss Application Server console or Server log to see the result of messages processing</i></p>");

        } catch (JMSException e) {
            e.printStackTrace();
            out.write("<h2>A problem occurred during the delivery of this message</h2>");
            out.write("</br>");
            out.write("<p><i>Go your the JBoss Application Server console or Server log to see the error stack trace</i></p>");
        } finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException e) {
                    e.printStackTrace();
                }
            }
            if (out != null) {
                out.close();
            }
        }
    }

    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }

}