Action里:        
        DynaActionForm dynaActionForm=(DynaActionForm)actionForm;
        MainNetvote mainNetvote=(MainNetvote)dynaActionForm.get("mainNetvote");
struts配置:
       <form-beans>
        <form-bean name="dynaActionForm" type="org.apache.struts.action.DynaActionForm">
            <form-property name="mainNetvote" type="netvote.modle.MainNetvote"/>
我要从JSP页面中获得这个对象,用来完成一个修改的操作.