錯誤設定選擇的選項值jsp頁面

Question

我是一個新jsp.Now，我儘量選擇設置選項如下：

<c:choose> 
    <c:when test = "${listMonth ne null}"> 
     <c:forEach items = "${listMonth}" var = "lsMonth"> 
      <c:choose> 
       <c:when test = "${lsMonth == month}"> 
        <option value = "${lsMonth}" selected = "selected">${lsMonth}</option> 
       </c:when> 
       <c:otherwise> 
        <c:choose> 
         <c:when test = "${lsMonth == monthNow}"> 
          <option value = "${lsMonth}" selected = "selected">${lsMonth}</option> 
         </c:when> 
         <c:otherwise> 
          <option value = "${lsMonth}">${lsMonth}</option> 
         </c:otherwise> 
        </c:choose> 
       </c:otherwise> 
      </c:choose> 
     </c:forEach> 
    </c:when> 
</c:choose> 

但是，它沒有選擇時$ {lsMonth ==月）只是選擇時$ {lsMonth == monthNow}。請幫我

Answer 1

請嘗試

JSTL空管檢查

<c:when test = "${not empty listMonth}"> 

JSTL EQ uivalent

<c:if test="${lsMonth eq month}">