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    DynaActionForm

    In this tutorial you will learn how to create Struts DynaActionForm. A regular ActionForm is developed in Java and declared in the struts_config. xml. The JavaBeans properties of a regular ActionForm are created by first defining the instance variable and then adding a getter and setter for that instance variable. A DynaActionForm has no associated Java class. Its JavaBeans properties are created by adding the <form-property> tag in Struts Config file.

    For Example : you have a EmpForm and you don't want a java class (EmpForm). EmpForm has propertis firstName, lastName, country .
    Follow the below four steps.

    Step 1. Adding DynaActionForm Entry in struts-config.xml

    Add the following entry in the struts-config.xml file. The <form-property/> tag is used to define the property for the form bean.

    <form-bean name="EmpForm"   
             type="org.apache.struts.action.DynaActionForm">
             <form-property name="firstName" type="java.lang.String"/>
             <form-property name="lastName" type="java.lang.String"/>
             <form-property name="country" type="java.lang.String" />
    </form-bean>

    Step 2. Add action mapping in the struts-config.xml file:

    Add the following action mapping in the struts-config.xml file:

    <action path="/saveEmp" type="com.techfaq.action.EmpSaveAction"
         name="EmpForm"
         scope="request"
         validate="true"
         input="/jsp/empform.jsp">

        <forward name="success" path="/jsp/success.jsp"/>
        <forward name="failure" path="/jsp/faiure.jsp" />

    </action>

    Step 3. In the Action class.

    public class EmpSaveAction extends Action {
    public ActionForward execute(
    ActionMapping mapping,
    ActionForm form,
    HttpServletRequest request,
    HttpServletResponse response) throws Exception{
    DynaActionForm empForm = (DynaActionForm)form;
    // this is the way you can retrive the value which is set in the JSP Page
    String firstName = (String)empForm.get("firstName");
    String lastName = (String)empForm.get("lastName");
    return mapping.findForward("success");
    }
    }
    }

    Step 4. In the JSP page (empform.jsp)

    <%@ taglib uri="/WEB-INF/struts-tiles.tld" prefix="tiles" %>
    <%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
    <%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
    <%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
    <html:form>
    <html:form action="/saveEmp" method="post">
    <html:text property="firstName" size="30" maxlength="30"/>
    <html:text property="lastName" size="30" maxlength="30"/>
    <html:text property="country" size="30" maxlength="30"/>
    <html:submit>Save</html:submit>
    </html:form>

    Now in the browser type http://localhost:8080/jsp/empform.jsp

    Two major differences between a regular ActionForm and a DynaActionForm.

    1) For a DynaActionForm, the type attribute of the form-bean is always org.apache.struts.action.DynaActionForm.


    2) A DynaActionForm has no associated Java class. Its JavaBeans properties are created by adding the <form-property> tag in Struts Config file.

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