simpleclient.java

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/*
 * Copyright (c) 2003 Sun Microsystems, Inc.  All rights reserved.  U.S. 
 * Government Rights - Commercial software.  Government users are subject 
 * to the Sun Microsystems, Inc. standard license agreement and 
 * applicable provisions of the FAR and its supplements.  Use is subject 
 * to license terms.  
 * 
 * This distribution may include materials developed by third parties. 
 * Sun, Sun Microsystems, the Sun logo, Java and J2EE are trademarks 
 * or registered trademarks of Sun Microsystems, Inc. in the U.S. and 
 * other countries.  
 * 
 * Copyright (c) 2003 Sun Microsystems, Inc. Tous droits reserves.
 * 
 * Droits du gouvernement americain, utilisateurs gouvernementaux - logiciel
 * commercial. Les utilisateurs gouvernementaux sont soumis au contrat de 
 * licence standard de Sun Microsystems, Inc., ainsi qu'aux dispositions 
 * en vigueur de la FAR (Federal Acquisition Regulations) et des 
 * supplements a celles-ci.  Distribue par des licences qui en 
 * restreignent l'utilisation.
 * 
 * Cette distribution peut comprendre des composants developpes par des 
 * tierces parties. Sun, Sun Microsystems, le logo Sun, Java et J2EE 
 * sont des marques de fabrique ou des marques deposees de Sun 
 * Microsystems, Inc. aux Etats-Unis et dans d'autres pays.
 */
import javax.jms.*;
import javax.naming.*;

/**
 * The SimpleClient class sends several messages to a 
 * destination.
 */
public class SimpleClient {

    /**
     * Main method.
     */
    public static void main(String[] args) {
        Context                 jndiContext = null;
        ConnectionFactory       connectionFactory = null;
        Connection              connection = null;
        Session                 session = null;
        Destination             dest = null;
        MessageProducer         producer = null;
        TextMessage             message = null;
        final int               NUM_MSGS = 3;
                
        /* 
         * Create a JNDI API InitialContext object.
         */
        try {
            jndiContext = new InitialContext();
        } catch (NamingException e) {
            System.out.println("Could not create JNDI API " +
                "context: " + e.toString());
            System.exit(1);
        }

        /* 
         * Look up connection factory and queue.  If either does
         * not exist, exit.
         */
        try {
            connectionFactory = (ConnectionFactory)
                jndiContext.lookup("java:comp/env/jms/MyConnectionFactory");
            dest = (Queue) 
                jndiContext.lookup("java:comp/env/jms/QueueName");
        } catch (NamingException e) {
            System.out.println("JNDI API lookup failed: " +
                e.toString());
            System.exit(1);
        }

        /*
         * Create connection.
         * Create session from connection; false means session is
         * not transacted.
         * Create sender and text message.
         * Send messages, varying text slightly.
         * Finally, close connection.
         */
        try {
            connection = 
                connectionFactory.createConnection();
            session = connection.createSession(false, 
                Session.AUTO_ACKNOWLEDGE);
            producer = session.createProducer(dest);
            message = session.createTextMessage();
            for (int i = 0; i < NUM_MSGS; i++) {
                message.setText("This is message " + (i + 1));
                System.out.println("Sending message: " + 
                    message.getText());
                producer.send(message);
            }
        } catch (JMSException e) {
            System.out.println("Exception occurred: " + 
                e.toString());
        } finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException e) {}
            }
            System.exit(0);
        }
    }
}