jsp - What is the equivalent Struts 2 tag for the following Struts 1 tag? -

i'm migrating struts 1 struts 2. don't know equivalent struts2 tag following struts1 tag

 <logic:equal value="1234" name="custdetail" property="ackmsg">       <% string str = valid %>  </logic:equal> 

the custdetail attribute set in request should have value 1234. if script variable str assigned 'valid' value. equivalent jsp code using struts2 tags

struts 1:

<logic:equal value="1234" name="custdetail" property="ackmsg">     <% string str = "valid" %> </logic:equal> 

struts 2 :

<s:if test="custdetail.ackmsg == '1234'">     <% string str = "valid" %> </s:if> 

struts 2 refactored remove scriptlet:

<s:if test="custdetail.ackmsg == '1234'">     <s:set var="str" value="%{'valid'}"/> </s:if> 

, , str value later with:

<s:property value="%{#str}" />