1.JSP中的写法
<% if(str == null) { %>
str is null
<% } else { %>
str not null
<% } %>
2.JSTL写法
<c:if test="${empty str}">
str为空
</c:if>
<c:if test="${not empty str}">
str不为空
</c:if>
<%--数据渲染--%>
<c:choose>
<c:when test="${null != referrerList}">
<c:forEach var="data" items="${referrerList}">
<tr>
<c:choose>
<c:when test="${empty data.shareName}">
<td>--</td>
</c:when>
<c:otherwise>
<td>${data.shareName}</td>
</c:otherwise>
</c:choose>
<td>${data.sharePhone}</td>
<td>${data.shareGoods}</td>
<td>${data.shareGoodsCount}</td>
<td>${data.shareGoodsAmount}</td>
<td>${data.shareOrderNum}</td>
<td>${data.shareOrderTime}</td>
<c:choose>
<c:when test="${data.shareOrderChannel == '0'}">
<td>app</td>
</c:when>
<c:when test="${data.shareOrderChannel == '1'}">
<td>公众号</td>
</c:when>
<c:otherwise>
<td>--</td>
</c:otherwise>
</c:choose>
<td>${data.shareOrderStatus}</td>
<c:choose>
<c:when test="${data.sharePayType == '0'}">
<td>一卡通支付</td>
</c:when>
<c:when test="${data.sharePayType == '1'}">
<td>微信支付</td>
</c:when>
<c:otherwise>
<td>--</td>
</c:otherwise>
</c:choose>
</tr>
</c:forEach>
</c:when>
</c:choose>
3.多条件判断
<c:if test="${result_map.connNew ne null and result_map.connNew ne 0}">
</c:if>
|| 可以用 or
&&可以用 and
==可以用 eq
!= 可以用 ne