addressaction.java

整合struts+velocity模板语言

package examples.app1;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.IOException;
import java.util.Locale;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.Globals;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;


/**
 * <p>A simple action that handles the display and editing of an
 * addres record. This action works with both JSP and Velocity templates.
 * The type of template to be used is defined in the Struts configuration
 * file.</p>
 *
 * <p>The action support an <i>action</i> URL parameter. This URL parameter
 * controls what this action class does. The following values are supported:</p>
 * <ul>
 *   <li>list - list address record, this is the default if no action parameter is specified
 *   <li>edit - edit address record
 *   <li>save - save address record
 * </ul>
 *
 *
 * @author <a href="mailto:[e-mail]"/>Gabe Sidler</a>
 * @version $Id: AddressAction.java 477914 2006-11-21 21:52:11Z henning $
 */
public class AddressAction extends Action
{

    // --------------------------------------------------------- Public Methods

    /**
     * Handle server requests.
     *
     * @param mapping The ActionMapping used to select this instance
     * @param actionForm The optional ActionForm bean for this request (if any)
     * @param request The HTTP request we are processing
     * @param response The HTTP response we are creating
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet exception occurs
     */
    public ActionForward execute(ActionMapping mapping,
                                 ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response)
                                 throws IOException, ServletException
    {
        String action;
        HttpSession session;

        ActionErrors errors = new ActionErrors();

        try
        {
            session = request.getSession();

            // fetch action from form
            action = ((AddressForm)form).getAction();

            servlet.log("[DEBUG] AddressAction at perform(): Action ist " + action);

            // Determine what to do
            if ( action.equals("edit") )
            {
                // forward to edit formular
                return (mapping.findForward("editAddress"));

            }
            else if (action.equals("save"))
            {
                // check if an address bean exits already
                AddressBean bean = (AddressBean)session.getAttribute("address");

                if (bean == null)
                {
                    bean = new AddressBean();
                    session.setAttribute("address", bean);
                }

                // update bean with the new values submitted
                bean.setFirstname( ((AddressForm)form).getFirstname() );
                bean.setLastname( ((AddressForm)form).getLastname() );
                bean.setStreet( ((AddressForm)form).getStreet() );
                bean.setZip( ((AddressForm)form).getZip() );
                bean.setCity( ((AddressForm)form).getCity() );
                bean.setCountry( ((AddressForm)form).getCountry() );
                bean.setLanguages( ((AddressForm)form).getLanguages() );

                // forward to list
                return (mapping.findForward("showAddress"));

            }
            else
            {
                String locale = ((AddressForm)form).getLocale();
                if (locale.equals("Deutsch"))
                    session.setAttribute(Globals.LOCALE_KEY, new Locale("de", ""));
                else
                    session.setAttribute(Globals.LOCALE_KEY, new Locale("en", ""));

                // forward to edit formular
                return (mapping.findForward("showAddress"));
            }
        }
        catch (Exception e)
        {
            //errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("lo053"));
            servlet.log("[ERROR] TskAction at final catch: " + e.getMessage());
            e.printStackTrace();

        }

        // Default if everthing else fails
        return (mapping.findForward("showAddress"));

    }
}