<c:if test="${fn:endsWith(param.aa, ‘end‘) }">
        ends
    </c:if>
    <c:if test="${fn:startsWith(param.aa, ‘start‘) }">
        start
    </c:if>

    <c:set var="test" value="http://www.mamicode.com/${param.aa }" scope="application"/>
    <c:if test="${ fn:indexOf(test,‘hello‘) != -1 }">
        hello
        </c:if>

    <c:set value="http://www.mamicode.com/${fn:split(header,‘,‘) }" var="headerList"/>
    <c:forEach var="item" items="${headerList }">
        ${item }<br/>
        </c:forEach>