textlistener.java

来自「JavaeeTutorial5的源代码。」· Java 代码 · 共 47 行

/*
 * Copyright 2007 Sun Microsystems, Inc.
 * All rights reserved.  You may not modify, use,
 * reproduce, or distribute this software except in
 * compliance with  the terms of the License at:
 * http://developer.sun.com/berkeley_license.html
 */


import javax.jms.MessageListener;
import javax.jms.Message;
import javax.jms.TextMessage;
import javax.jms.JMSException;


/**
 * The TextListener class implements the MessageListener
 * interface by defining an onMessage method that displays
 * the contents of a TextMessage.
 *
 * This class acts as the listener for the SimpleAsynchConsumer
 * class.
 */
public class TextListener implements MessageListener {
    /**
     * Casts the message to a TextMessage and displays its text.
     *
     * @param message     the incoming message
     */
    public void onMessage(Message message) {
        TextMessage msg = null;

        try {
            if (message instanceof TextMessage) {
                msg = (TextMessage) message;
                System.out.println("Reading message: " + msg.getText());
            } else {
                System.err.println("Message is not a TextMessage");
            }
        } catch (JMSException e) {
            System.err.println("JMSException in onMessage(): " + e.toString());
        } catch (Throwable t) {
            System.err.println("Exception in onMessage():" + t.getMessage());
        }
    }
}