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Tags/Keywords : Struts, Struts2 Tutorial, Struts 2 Example, Struts2
Author : ISHTEK
Date (Year/Month/Date): 2009-02-19
Struts2 Tag Reference - http://struts.apache.org/2.0.14/docs/tag-reference.html

All the Struts2 Tags , those can be found in the above link are under my scanner
for providing appropriate sample/example on how to use these Struts2 Tags:

-> IF Tag : (http://struts.apache.org/2.0.14/docs/if.html)
-> ITERATOR Tag: http://struts.apache.org/2.0.14/docs/iterator.html
As in Struts2 , for each request a new action class instance is created and
associated, it is not an issue from Thread-Safe perspective to use an instance
variable in Action class POJO.

So we shall be using sample  POJO action class with variables defined at instance
level and use these variables to test various Struts2 tags, such as IF Tag,
Iterator Tag and many more.

I named this action class as IfExample.java, as this is having code for both
if and iterator tags implementations.
-----------------------------------------------------------------------------------
package sample;
import java.util.List;
import java.util.ArrayList;

public class IfExample {
//for if tag test

    private boolean status = false;

    public boolean getStatus() {
        return status;
    }
    public void setStatus(boolean st) {
        this.status = st;
    }


    //for iterator tag test
    private Sample sample;

    public Sample getSample() {
        return sample;
    }
    public void setSample(Sample sample) {
        this.sample = sample;
    }
    public String execute() throws Exception {
        Sample sample1 = new Sample();
        List names = new ArrayList();
        names.add("test");
        names.add("test1");
        names.add("test2");
        names.add("test3");
        sample1.setNames(names);
        setSample(sample1);
        return "okay";
    }

}
-----------------------------------------------------------------------------------

The struts.xml file as following configurations for these two Tags:

struts.xml
-----------------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="iftest" namespace="/iftest" extends="struts-default">
       <action name="ifexample" class="sample.IfExample">
           <result name="okay">/if-test.jsp</result>
       </action>
    </package>
    <package name="iteratortest" namespace="/iteratortest"
                                    extends="struts-default">
       <action name="iteratorexample" class="sample.IfExample">
           <result name="okay">/iterator-test.jsp</result>
       </action>
    </package>
</struts>
-----------------------------------------------------------------------------------

Corresponding JSP files having test code for IF and ITERATOR tags are as follows:

if-test.jsp
-----------------------------------------------------------------------------------
<%@ taglib prefix="st2" uri="/struts-tags" %>
<st2:if test="status">
This line is within if tag
</st2:if>
<st2:else>
This line is within else tag
</st2:else>
-----------------------------------------------------------------------------------
As you can see status is the boolean variable in IfExample action class,
and depending on the value of this field, appropriate message gets printed out
on browser, in this case as status value is 'false', so the message gets printed
on is:
This line is within else tag

and for iterator tag specific JSP file iterator-test.jsp
-----------------------------------------------------------------------------------
<%@ taglib prefix="st2" uri="/struts-tags" %>
<st2:iterator value="sample.names" var="n">
<st2:text name="%{n}"/><br>
</st2:iterator>
-----------------------------------------------------------------------------------

sample is the variable name in IfExample of type Sample, and names is a variable in
Sample class and of type List.
So this JSP file prints values as stored in execute method of IfExample Action class
as follows:

test
test1
test2
test3

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