c:foreach如何嵌套循环,求指教,求优化

 public class PopedomItem {
 private String id;
 private String pid;
 private String name;
 private String checked;
 private List<PopedomItem> children;
}

<c:forEach items="${items}" var="item">
    <tr id="${item.id}">
     <td>
      <span class="folder">${item.name }</span>
     </td>
     <td>
      --
     </td>
     <td>
      备注说明
     </td>
    </tr>
    <c:forEach items="${item.children}" var="it">
     <tr id="${it.id}" class="child-of-${it.pid }">
      <td>
       <span class="<c:if test="${!empty it.children }">folder</c:if><c:if test="${empty it.children }">file</c:if>">${it.name }</span>
      </td>
      <td>
       --
      </td>
      <td>
       备注说明
      </td>
     </tr>
     <c:forEach items="${it.children}" var="i">
      <tr id="${i.id}" class="child-of-${i.pid }">
       <td>
        <span class="file">${i.name }</span>
       </td>
       <td>
        --
       </td>
       <td>
        备注说明
       </td>
      </tr>
     </c:forEach>
    </c:forEach>
   </c:forEach>

<span class="<c:if test="${!empty it.children }">folder</c:if><c:if test="${empty it.children }">file</c:if>">${it.name }</span>

<c:choose>
<c:when test="${!empty it.children }">
<c:set  var="class" value="folder"/>
</c:when>
<c:otherwise>
<c:set  var="class" value="file"/>
</c:otherwise>
</c:choose>
 
<span class="${class}">${it.name }</span>