simplemessageclient.java

卡内基梅隆大学软件工程课件,很全面

/*
 *
 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

import javax.jms.*;
import javax.naming.*;

public class SimpleMessageClient {

    public static void main(String[] args) {

        Context                 jndiContext = null;
        QueueConnectionFactory  queueConnectionFactory = null;
        QueueConnection         queueConnection = null;
        QueueSession            queueSession = null;
        Queue                   queue = null;
        QueueSender             queueSender = null;
        TextMessage             message = null;
        final int               NUM_MSGS = 3;

        try {
            jndiContext = new InitialContext();
        } catch (NamingException e) {
            System.out.println("Could not create JNDI " +
                "context: " + e.toString());
            System.exit(1);
        }

        try {
            queueConnectionFactory = (QueueConnectionFactory)
                jndiContext.lookup
                ("java:comp/env/jms/MyQueueConnectionFactory");
            queue = (Queue) jndiContext.lookup("java:comp/env/jms/QueueName");
        } catch (NamingException e) {
            System.out.println("JNDI lookup failed: " +
                e.toString());
            System.exit(1);
        }

        try {
            queueConnection = 
                queueConnectionFactory.createQueueConnection();
            queueSession = 
                queueConnection.createQueueSession(false, 
                    Session.AUTO_ACKNOWLEDGE);
            queueSender = queueSession.createSender(queue);
            message = queueSession.createTextMessage();

            for (int i = 0; i < NUM_MSGS; i++) {
                message.setText("This is message " + (i + 1));
                System.out.println("Sending message: " + 
                    message.getText());
                queueSender.send(message);
            }

        } catch (JMSException e) {
            System.out.println("Exception occurred: " + e.toString());
        } finally {
            if (queueConnection != null) {
                try {
                    queueConnection.close();
                } catch (JMSException e) {}
            } // if
            System.exit(0);
        } // finally
    } // main
} // class