how to compare list elements(type string) and string(in request scope) using struts 2 tags

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With the IteratorStatus object:

<s:iterator value="lis" status="ctr">
    <s:property /> 
    <s:if test="%{#request.str.equals(lis[#ctr.index])}">
        -> This value from "lis" is equal to the value of "str"
    </s:if>
    <br/>
</s:iterator>

With the var parameter:

<s:iterator value="lis" var="currentValue">
    <s:property /> 
    <s:if test="%{#request.str.equals(#currentValue)}">
        -> This value from "lis" is equal to the value of "str"
    </s:if>
    <br/>
</s:iterator>

With the top keyword:

<s:iterator value="lis">
    <s:property /> 
    <s:if test="%{#request.str.equals(top)}">
        -> This value from "lis" is equal to the value of "str"
    </s:if>
    <br/>
</s:iterator>

You may wanna read the short OGNL Language Guide for more details.

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