textlistener.java

Java开发的权限管理的例子

package org.artemis.right.jms.topic;
/*
*
* Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
* 
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
* 
* - Redistributions of source code must retain the above copyright
*   notice, this list of conditions and the following disclaimer.
* 
* - Redistribution in binary form must reproduce the above
*   copyright notice, this list of conditions and the following
*   disclaimer in the documentation and/or other materials
*   provided with the distribution.
* 
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
* DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
* RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
* ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
* FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
* SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
* THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
* 
* You acknowledge that this software is not designed, licensed or
* intended for use in the design, construction, operation or
* maintenance of any nuclear facility.
* 
*/
/**
* 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 SimpleTopicSubscriber
* class.
*/
import javax.jms.*;

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.out.println("Message of wrong type: " +
                   message.getClass().getName());
           }
       } catch (JMSException e) {
           System.out.println("JMSException in onMessage(): " +
               e.toString());
       } catch (Throwable t) {
           System.out.println("Exception in onMessage():" +
               t.getMessage());
       }
   }
}