smartticketsessionlistener.java

这个范例程序演示了利用j2me技术开发无线服务器支持的应用。这是一个电影票订购程序

/*
 * Copyright 2001, 2002, 2003 Sun Microsystems, Inc. All Rights Reserved.
 * Except for any files in PNG format (which are marked with the filename
 * extension ".png"), GIF format (which are marked with the filename
 * extension ".gif"), or JPEG format (which are marked with the filename
 * extension ".jpg"), redistribution and use in source and binary forms,
 * with or without modification, are permitted provided that the
 * following conditions are met:
 * - Redistribution 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.
 * You may compile, use, perform and display the following files with
 * original Java Smart Ticket Sample Application code obtained from Sun
 * Microsystems, Inc. only:
 * - files in PNG format and having the ".png" extension
 * - files in GIF format and having the ".gif" extension
 * - files in JPEG format and having the ".jpg" extension
 * You may not modify or redistribute .png, .gif, or .jpg files in any
 * form, in whole or in part, by any means without prior written
 * authorization from Sun Microsystems, Inc. and its licensors, if any.
 * Neither the name of Sun Microsystems, Inc., the 'Java Smart Ticket
 * Sample Application', 'Java', 'Java'-based names, 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
 * MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING 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.
 * $Id: SmartTicketSessionListener.java,v 1.4 2003/03/19 01:53:50 ro89390 Exp $
 */
package com.sun.j2me.blueprints.smartticket.server.web.midp;

import javax.servlet.*;
import javax.servlet.http.*;
import com.sun.j2me.blueprints.smartticket.shared.midp.ApplicationException;

/**
 * This listener sets up resources and cleans them up as sessions are created and destroyed.
 */
public class SmartTicketSessionListener implements HttpSessionListener, 
        HttpSessionBindingListener {
    public void sessionCreated(HttpSessionEvent e) {
        try {
            SmartTicketBD smartTicketBD = 
                new SmartTicketBD(e.getSession().getServletContext());

            e.getSession().setAttribute(SmartTicketServlet.SESSION_ATTRIBUTE_SMART_TICKET_BD, 
                                        smartTicketBD);
        } catch (ApplicationException ae) {
            // XXX
        } 
    } 

    public void sessionDestroyed(HttpSessionEvent e) {

        /*
         * SmartTicketBD smartTicketBD = (SmartTicketBD) e.getSession().getAttribute(SmartTicketServlet.SESSION_ATTRIBUTE_SMART_TICKET_BD);
         * if (smartTicketBD != null) {
         * smartTicketBD.clear();
         * }
         */
        return;
    } 

    public void valueBound(HttpSessionBindingEvent event) {}

    public void valueUnbound(HttpSessionBindingEvent event) {
        if (event.getName().equals(SmartTicketServlet.SESSION_ATTRIBUTE_SMART_TICKET_BD)) {
            SmartTicketBD smartTicketBD = (SmartTicketBD) event.getValue();

            if (smartTicketBD != null) {
                smartTicketBD.clear();
            } 
        } 
    } 

    /**
     * @link dependency
     */
    /* # SmartTicketBD lnkSmartTicketBD; */
}