How to iterate Set elements using Struts 2 tags

I have two Sets

set1  contains("A","B","C","D") elements
set2  contains("E","F","D","G") elements

I want to compare every element of set1 with every element of set2 and display matched elements using Struts2 tags.

Try the code below:

<s:iterator var="val1" value="set1">
 <s:iterator var="val2" value="set2">
  <s:if test="#val1 == #val2">
   <s:property /><br>
  </s:if>
 </s:iterator>
</s:iterator>

Rearranged to better list the several ways:

With two Iterators:

<s:iterator value="setOne" var="first" status="ctr1">
    <s:iterator value="setTwo" var="second" status="ctr2">
        <s:if test="%{#first == #second}">
            Common value detected : [<s:property value="%{#first}"/>]
            <br/> setOne position : [<s:property value="%{#ctr1.index}"/>] 
            <br/> setTwo position : [<s:property value="%{#ctr2.index}"/>]
            <br/>
        </s:if>
    </s:iterator>
</s:iterator>

With a single Iterator and Set.contains(Object):

<s:iterator value="setOne" var="first" status="ctr1">
    <s:if test="%{setTwo.contains('#first')}">
        Common value detected : [<s:property value="%{#first}"/>] <br/>
    </s:if>
</s:iterator>

With a single Iterator and pure OGNL:

<s:iterator value="setOne" var="first" status="ctr1">
    <s:if test="%{#first in setTwo}">
        Common value detected : [<s:property value="%{#first}"/>] <br/>
    </s:if>
</s:iterator>

Without Iterators, using OGNL List Selection only (thanks to @AleksandrM for the code):
```
<s:property value="setOne.{? #this in setTwo}"/>
```

Try this.i think it will work for you. and if not then do some trial & error on this.

<s:iterator value="set1" var="first">
  <s:iterator value="set2" var="second">

   <s:set name="valueofset1" value="%{#set1.index}" />  
   <s:set name="valueOfSet2" value="%{#set2.index}" />  

     <s:if test="valueofset1 == valueOfSet2">
      //Do what ever you want
     </s:if>

  </s:iterator>
</s:iterator>

来源：https://stackoverflow.com/questions/20069658/how-to-iterate-set-elements-using-struts-2-tags

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