jstl中判断list中是否包含某个值的简单方法

<a id="aHref_${device[0]}" onclick='addSelectDeviceId(${device[0]})'>	<c:set var="iscontain" value="false" /> 	<c:forEach items="${sessionScope.SelectDeviceIdsList}" var="map">				<c:if test="${map.key eq device[0]}">   	<c:set var="iscontain" value="true" />  </c:if> 	</c:forEach>																		<c:if test="${iscontain}">		<img id="sign_${device[0]}" name="sign_${device[0]}" 			 src="images/expantion/ok_sign.png"/>	<span style="white-space:pre">	</span></c:if>																		<c:if test="${!iscontain}">			<img id="sign_${device[0]}" name="sign_${device[0]}" 						src="images/expantion/add_sign.png"/>	</c:if></a>