Today i am sharing the demo example for struts2 control tags IF , else and elseIF.This demo example gives you the better
idea to understand to use the control tags in your JSP page.
There are the following senario in real world application to check the condition.
1. Check condition using boolean variable.
2. Check condition using String object.
3. Check condition using collection object / bean object
How can we use struts tags IF , else and elseif condition to fullfill our requirement?
Demo Example steps by step:
1. Filter Dispatcher Entry in web.xml file
2. struts.xml file
3. Struts2 Acton Class
4. Create a JSP file
Now Run the following below URL in your browser :
If you have any query so please free feel to ask.
There are the following senario in real world application to check the condition.
1. Check condition using boolean variable.
2. Check condition using String object.
3. Check condition using collection object / bean object
How can we use struts tags IF , else and elseif condition to fullfill our requirement?
Demo Example steps by step:
1. Filter Dispatcher Entry in web.xml file
<?xml version="1.0" encoding="UTF-8"?><web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.FilterDispatcher </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>2. struts.xml file
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.devMode" value="true" /> <package name="struts2" extends="struts-default" namespace="/"> <action name="ifElseAction"> <result>/ifelse.jsp</result> </action> </package></struts>3. Struts2 Acton Class
package com.example.actions;import java.util.ArrayList;import java.util.List; import com.opensymphony.xwork2.ActionSupport; public class IfElseConditionAction extends ActionSupport { private List<String> checkArrayList = new ArrayList<String>(); private String myStringValue; private boolean myBooleanValue; public String execute() { checkArrayList.add("aoiblog1"); checkArrayList.add("aoiblog2"); checkArrayList.add("aoiblog3"); checkArrayList.add("aoiblog4"); checkArrayList.add("aoiblog5"); myStringValue = "aoi blog"; myBooleanValue = true; return SUCCESS; } public List<String> getCheckArrayList() { return checkArrayList; } public void setCheckArrayList(List<String> checkArrayList) { this.checkArrayList = checkArrayList; } public String getMyStringValue() { return myStringValue; } public void setMyStringValue(String myStringValue) { this.myStringValue = myStringValue; } public boolean isMyBooleanValue() { return myBooleanValue; } public void setMyBooleanValue(boolean myBooleanValue) { this.myBooleanValue = myBooleanValue; }}4. Create a JSP file
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%@taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>AOI Blog - If Else Condition</title> </head> <body> <!-- For Boolean Value --> <s:if test="myBooleanValue"> I am returning TRUE.<br/> </s:if> <s:else> I am returning FALSE.<br/> </s:else> <!-- For String Value --> <s:if test="%{myStringValue!=null}"> String is not null<br/> </s:if> <s:elseif test="%{myStringValue==null}"> String is null<br/> </s:elseif> <s:else> String is null<br/> </s:else> <!-- For Object Value --> <s:if test="%{checkArrayList.size()==0}"> Object Size is Zero<br/> </s:if> <s:else> Object Size is not a Zero<br/> </s:else> </body></html>Now Run the following below URL in your browser :
http://localhost:8080/yourprojectName/ifElseAction.actionIf you have any query so please free feel to ask.
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