bbpublisher.java

21天学通J2EE的例子4

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

public class BBPublisher {

    private Connection connection;
    private Session session;
    private MessageProducer producer;

    public static void main(String[] args) {
        BBPublisher publisher = null;
        try {
            publisher = new BBPublisher("jms/TopicConnectionFactory","jms/bulletinBoard");
            System.out.println ("Publisher is up and running");
            for (int i = 0; i < 10; i++) {
                String bulletin = "Bulletin Board Message number: " + i;
                System.out.println (bulletin);
                publisher.sendMessage(bulletin);
            }
        } 
        catch(Exception ex) {
             System.err.println("Exception in BulletinBoardPublisher: " + ex);
        }
        finally {
            try {publisher.close();} catch(Exception ex){}
        }
    }

    public BBPublisher(String JNDIconnectionFactory, String JNDItopic) throws JMSException, NamingException {
        Context context = new InitialContext();
        ConnectionFactory connectionFactory = (ConnectionFactory)context.lookup(JNDIconnectionFactory);
        connection = connectionFactory.createConnection();
        session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        Destination bulletinBoard = (Destination)context.lookup(JNDItopic);
        producer = session.createProducer(bulletinBoard);
    }

    public void sendMessage(String msg) throws JMSException {
        TextMessage message = session.createTextMessage();
        message.setText(msg);
        producer.send(message);
    }

    public void close() throws JMSException {
        connection.close();
    }
}