JSTL 字符串以逗号分隔转数组

       <c:forEach items="${jsonArray}" var="jsonArray">
            <c:set value="${fn:split(jsonArray.keywords, ',')}" var="key"/>
            <c:forEach items="${key}" var="key">
                <span class="keyword">${key}</span>
            </c:forEach>
        </c:forEach>