spring - 如何使用 jSTL 比较 2 个值

Question

我在 Controller 中有列表

List l=serviceClientServiceImpl.getSavedParents(clientId); 
uiModel.addAttribute("savedParents",l);
List<Parent> parentList = 
(List<Parent>) serviceClientServiceImpl.getParents("Parent",Long.valueOf(clientId)); 
uiModel.addAttribute("parentList", parentList);

我正在 jsp 中检索它，如下所示

<ul style="max-width: 300px;" class="nav nav-pills nav-stacked" id="menuId"> 
<c:forEach items="${parentList}" var="test"> 

<li ><a href="#" value="${test.id}-${test.category}" id="${parent.id}" onclick="return getQuestions(this);" > 
<input type="checkbox" value="${test.id}">${test.name }</a></li> 


</c:forEach> 
</ul> 
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv 

<c:forEach items="${savedParents}" var="test1"> 
<ul style="max-width: 300px;" class="nav nav-pills nav-stacked"> 
<li class="active"><a href="#" value="${test1.id}" onclick="return getQuestions(this);"> 
<input type="checkbox" value="${test1.id}"></a></li> 

</ul> 
</c:forEach>

现在我想合并两者，并且在 test.id 等于 test1.id 的地方，然后我想添加一个 html class="active"

我尝试了以下方法

<ul style="max-width: 300px;" class="nav nav-pills nav-stacked"  id="menuId">
<c:forEach items="${parentList}" var="test">
<c:forEach items="${savedParents}" var="test1">
<c:when test3="${test.id}==${test1.id }">
  <li ><a href="#" class="active" value="${test.id}-${test.category}" id="${parent.id}" onclick="return getQuestions(this);" >
  <input type="checkbox" value="${test.id}">${test.name }</a></li>

</c:when>
<c:otherwise>
  <li ><a href="#" value="${test.id}-${test.category}" id="${parent.id}" onclick="return getQuestions(this);" >
  <input type="checkbox" value="${test.id}">${test.name }</a></li>
</c:otherwise>

</c:forEach>

  <%-- <li ><a href="#" value="${test.id}-${test.category}" id="${parent.id}" onclick="return getQuestions(this);" >
  <input type="checkbox" value="${test.id}">${test.name }</a></li> --%>


</c:forEach>
 </ul>
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

但我在 eclipse 中遇到错误

Multiple annotations found at this line:
    - Missing required attribute 
     "test"
    - Undefined attribute name 
     "test3"
    - Missing required attribute 
     "test"
    - Undefined attribute name 
     "test3"

有人可以帮助我吗？

Answer 1

尝试以这种方式比较字符串

<c:when test="${test.id == test1.id }">

您还可以使用eq代替==

<c:when test="${test.id eq test1.id }">