Jstl与Select的默认值

jsp页面需要有语句<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>

工程中需要导入jstl的jar包
1.单个变量型（有默认值）
             <select name="end_time_year">
                     <c:choose>
                           <c:when test="${a_year == '2007'}">
                               <option value="2007" selected>2007</option>
                           </c:when>
                           <c:otherwise>
                               <option value="2007">2007</option>
                           </c:otherwise>
                     </c:choose>
                     <c:choose>
                           <c:when test="${a_year == '2008'}">
                               <option value="2008" selected>2008</option>
                           </c:when>
                           <c:otherwise>
                               <option value="2008">2008</option>
                           </c:otherwise>
                     </c:choose>
             </select>
注： 其中a_year是从后台传过来的。如果传过来的值是2007，则选择下拉框中2007默认被选中。

2.遍历list（有默认值）

             <select name="type">
                   <logic:iterate id="type2" name="type2List" scope="request">
                       <c:choose>
                           <c:when test="${type2 == a_fault_type}">
                               <option value="<c:out value="${a_fault_type}"/>" selected><c:out value="${a_fault_type}"/></option>
                           </c:when>
                           <c:otherwise>
                               <option value="<c:out value="${type2}"/>"><c:out value="${type2}"/></option>
                           </c:otherwise>
                      </c:choose>
                   </logic:iterate>
             </select>

注：name="type2List" scope="request"表示从后台action中通过request的方式传值。
    <c:choose>

        <c:when>
        </c:when>
        <c:otherwise>
        </c:otherwise>
     </c:choose>
    可以理解为
       if(){
       }else{
       }

3.遍历list(无默认值)

          <select name="type">
                   <logic:iterate id="type2" name="type2List" scope="request">
                            <option value="<c:out value="${type2}"/>"><c:out value="${type2}"/></option>
                   </logic:iterate>
           </select>