<c:if test="${empty str}"> str为空</c:if> <c:if test="${not empty str}"> str不为空</c:if> 相关文章: 2022-12-23 2021-11-21 2021-12-04 2021-11-27 2021-11-28 2021-11-28 2021-07-04 2021-06-11