s:if 用法

1:直接写表达式

          <s:set name="china" value="china">

                  <s:if test="${china=='china'}">show</s:if>

                   result:show

          </s:set>

          <s:set name="count" value="99">

                   <s:if test="${count>0}">bigger than 0</s:if>

          <s:else>not</s:else>

          result:bigger than 0
</s:set>

2:直接读对象

         <s:if test="request.price==null || request.price>=0"></s:if>

3:直接读对象的另一种写法

         <s:if test="%{设置到action中的值!=null}"></s:if>

4:判断多个条件

         <s:if test='%{isShowAll=="Y" || isShowAll==null || isShowAll==""}'>

                 <li class="selected"></li>
         </s:if>
         <s:else>
                 <li>else</li>
          </s:else>
5:在遍历里面用判断

          <s:iterator id="id" value="lable">

                 <s:if test="%{#id.attrValue!=0}">

                     <s:property value="id.attrValue"/>

                 </s:if>
          </s:iterator>
6:s:if中的字符串判断
          单引号套双引号：如

          <s:if test='%{#all[1]=="男"}'></s:if>