Defining and configure an DynaActionForm
Defining and configure an DynaActionForm
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The Struts DynaActionForm class enables you to create a “virtual” form bean in Struts configuration file instead of create a real Java form bean class. It can avoid you to create many simple but tedious form bean classes.
DynaActionForm do not have to write setters and getters. No bean class is required for the DynaActionForm.With DynaActionForm, the property access is no different than using request.get Parameter( .. ).DynaActionForm construction at runtime requires a lot of Java Reflection (Introspection) machinery that can be avoided.
Directory Structure of DynaActionFormExample in Struts 1.3 Using MyEclipse IDEindex.jsp<%@taglib uri="http://struts.apache.org/tags-html" prefix="html"%> <%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%> <html> <head> <title>Struts DynaActionForm example</title> </head> <body> <h3>Struts DynaActionForm example</h3> <html:form action="/myaction"> <bean:message key="label.name"/>: <html:text property="name"/><br/> <bean:message key="label.password"/>: <html:password property="password"/><br/> <br/> <html:submit><bean:message key="label.submit"/></html:submit> <html:reset><bean:message key="label.reset"/></html:reset> </html:form> </body> </html>web.xml<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Maven Struts Examples</display-name> <servlet> <servlet-name>action</servlet-name> <servlet-class> org.apache.struts.action.ActionServlet </servlet-class> <init-param> <param-name>config</param-name> <param-value> /WEB-INF/struts-config.xml </param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>action</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app>struts-config.xml<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd"> <struts-config> <form-beans> <form-bean name="dynaForm" type="org.apache.struts.action.DynaActionForm"> <form-property name="name" type="java.lang.String"/> <form-property name="password" type="java.lang.String"/> </form-bean> </form-beans> <global-exceptions /> <global-forwards /> <action-mappings > <action attribute="dynaForm" input="/index.jsp" name="dynaForm" path="/myaction" scope="request" type="org.r4r.struts.DynaAction" cancellable="true" > <forward name="success" path="/success.jsp"></forward> </action> </action-mappings> <message-resources parameter="org.r4r.struts.ApplicationResources" /> </struts-config>DynaAction.javapackage org.r4r.struts; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; public class DynaAction extends Action { public ActionForward execute(ActionMapping mapping,ActionForm form, HttpServletRequest request,HttpServletResponse response) throws Exception{ return mapping.findForward("success"); } }ApplicationResources.properties#label message label.name = User Name label.password = Password label.submit = Submit label.reset = Resetsuccess.jsp<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%> <html> <head> <title>Struts DynaActionForm example</title> </head> <body> <h3>Struts DynaActionForm Example</h3> <h4>Welcome , <bean:write name="dynaForm" property="name" /></h4> <h4>Your password , <bean:write name="dynaForm" property="password" /></h4> </body> </html>Output
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