< logic:present > and < logic:notPresent > Logic Tag Example
< logic:present > and < logic:notPresent > Logic Tag Example
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< logic:present > and < logic:notPresent > Logic Tag Example:-Struts 1.3 provide the < logic:present > and < logic:notPresent > Logic Tag Example. This tag provide the facility to display information which are present in the action class and not display which are not present in the action class
Directory Structure of LogicPresentTagExample in Struts 1.3 Using MyEclipse IDEindex.jsp<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %> <%@taglib uri="http://struts.apache.org/tags-html" prefix="html" %> <html> <head> <title><bean:message key="label.title"/></title> </head> <body> <h3><bean:message key="label.header"/></h3> <html:link action="/presentTagAction.do" > Struts 1.3 Present Tag Example </html:link> </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="presentTagForm" type="org.r4r.struts.PresentTagForm"/> </form-beans> <global-exceptions /> <global-forwards /> <action-mappings> <action path="/presentTag" type="org.apache.struts.actions.ForwardAction" parameter="/index.jsp"/> <action path="/presentTagAction" name="presentTagForm" type="org.r4r.struts.PresentTagAction"> <forward name="success" path="/success.jsp"/> </action> </action-mappings> <message-resources parameter="org.r4r.struts.ApplicationResources" /></struts-config>PresentTagForm.javapackage org.r4r.struts; import org.apache.struts.action.ActionForm; @SuppressWarnings("serial") public class PresentTagForm extends ActionForm { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } }PresentTagAction.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 PresentTagAction extends Action { public ActionForward execute(ActionMapping mapping,ActionForm form, HttpServletRequest request,HttpServletResponse response) throws Exception{ PresentTagForm presentTagForm=(PresentTagForm)form; presentTagForm.setName("Kumar Bal Mukund"); return mapping.findForward("success"); } }ApplicationResources.properties# Resources for parameter 'org.r4r.struts.ApplicationResources' # Project Struts1.3_LogicPresentTagExample label.title=Struts 1.3 < logic:present > and < logic:notPresent >tag Example label.header=Struts 1.3 < logic:present > and < logic:notPresent >tag Examplesuccess.jsp<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %> <%@taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %> <html> <head> <title><bean:message key="label.title"/></title> </head> <body> <h3><bean:message key="label.header"/></h3> <h4> <logic:present name="presentTagForm" property="name"> The Student Name is Kumar Bal Mukund. </logic:present> <logic:notPresent name="presentTagForm" property="name"> The Student Name is not Present. </logic:notPresent> </h4> </body> </html>Output
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