Summary of common methods of struts2 tags

1. Find whether there is a value equal to id in a list

<s:set name="flag" value="false" />
<s:iterator value="courses" id="item">
    <s:if test="${item==id}">
        <s:set name="flag" value="true" />
    </s:if>
</s:iterator>

2. Implement addition

Pure digital addition

<s:property value="1+2"/>
<s:property value="%{1+2}"/>

Addition with variables (the variables need to be Numeric type, if one of them is a string, it is string concatenation)

<s:property value="msgPK+msgPK"/>
<s:property value="%{msgPK+msgPK}"/>
<s:property value="#stat.index+1"/>

3. Get the subscript of iterator

<s:iterator value="prVoteQuestionAnswerList" id="class" status="num">
第<s:property value="#num.index+1"/>题
</s:iterator>

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