//引入标签库
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<c:if test="${empty items}">
   无数据 = items为null或者items.size<=0
</c:if>

<c:if test="${not empty items}">
    有数据 = items存在&&items.size>0
</c:if>

//引入标签库
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>


<c:if test="${ (empty requestScope.dataList) || (fn:length( requestScope.dataList ) <= 0) }">
无数据 = items为null或者items.size<=0
</c:if>

<c:if test="${ (!empty requestScope.dataList) && (fn:length( requestScope.dataList ) > 0) }">
有数据 = items存在&&items.size>0
</c:if>