<!-- 直接在页面上写 -->
<select id="sex" name="sex" >
<!-- 方式一 -->
<option value="0" ${sex == 0?'selected':''}>男</option>
<option value="1" ${sex == 1?'selected':''}>女</option>
<!-- 方式二 -->
<option value="0" <c:if test="${'0' eq sex}">selected</c:if> >男</option>
<option value="1" <c:if test="${'1' eq sex}">selected</c:if> >女</option>
<!-- 方式三 -->
<option value="0" <s:if test="%{sex==1}">selected</s:if> >男</option>
<option value="1" <s:if test="%{sex==2}">selected</s:if> >女</option>
</select>