EventDispatchAction 学习

/* 
* $Id: EventDispatchActionExample.java 471754 2006-11-06 14:55:09Z husted $ 
* 
* 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. 
*/ 
package org.apache.struts.webapp.dispatch; 

import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import org.apache.struts.actions.EventDispatchAction; 
import org.apache.struts.action.ActionForm; 
import org.apache.struts.action.ActionForward; 
import org.apache.struts.action.ActionMapping; 
import org.apache.struts.action.ActionMessage; 
import org.apache.struts.action.ActionMessages; 

/** 
* Example EventDispatchAction. 
* 
* @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $ 
*/ 
public  class EventDispatchActionExample  extends EventDispatchAction { 

         private  int fooCount; 
         private  int barCount; 

         /** 
         * Example "foo" method. 
         * 
         * @param mapping The ActionMapping used to select this instance 
         * @param form The optional ActionForm bean for this request 
         * @param request The servlet request we are processing 
         * @param response The servlet response we are creating 
         * 
         * @exception Exception if business logic throws an exception 
         */ 
         public ActionForward doFoo(ActionMapping mapping, 
                                                             ActionForm form, 
                                                             HttpServletRequest request, 
                                                             HttpServletResponse response) 
                 throws Exception { 

                fooCount++; 

                ActionMessages messages =  new ActionMessages(); 
                messages.add( "foo",  new ActionMessage( "count.foo.message", fooCount+"")); 
                saveMessages(request, messages); 

                 return (mapping.findForward( "success")); 

        } 

         /** 
         * Example "bar" method. 
         * 
         * @param mapping The ActionMapping used to select this instance 
         * @param form The optional ActionForm bean for this request 
         * @param request The servlet request we are processing 
         * @param response The servlet response we are creating 
         * 
         * @exception Exception if business logic throws an exception 
         */ 
         public ActionForward doBar(ActionMapping mapping, 
                                                             ActionForm form, 
                                                             HttpServletRequest request, 
                                                             HttpServletResponse response) 
                 throws Exception { 
                barCount++; 

                ActionMessages messages =  new ActionMessages(); 
                messages.add( "bar",  new ActionMessage( "count.bar.message", barCount+"")); 
                saveMessages(request, messages); 

                 return (mapping.findForward( "success")); 

        } 

} 

<action path= "/eventAction-default"    
                                type= "org.apache.struts.webapp.dispatch.EventDispatchActionExample" 
                                parameter= "doFoo,bar=doBar,default=doBar" 
                                name= "testForm" 
                                scope= "request"> 
                        <forward name= "success" path= "/eventAction.jsp"/> 
                </action>

                 <html:form action= "eventAction-default" style= "display:inline"> 
                            <html:submit property= "doFoo"><bean:message key= "button.foo.label" /></html:submit> 
                    </html:form> 
                              
                    <html:form action= "eventAction-default" style= "display:inline"> 
                     <input type= "hidden" name= "Method" value= "doBar" /> 
                            <html:submit><bean:message key= "button.bar.label" /></html:submit> 
                    </html:form> 
                              
                    <html:form action= "eventAction-default" style= "display:inline"> 
                            <html:submit><bean:message key= "button.default.label" /></html:submit> 
                    </html:form>