java - 在 html 中迭代 TreeSet :option

Question

有一种情况，我需要迭代 TreeSet 以便使用 html:option 填充下拉菜单，如下所示，

<html:select id="schoolLevel" name="schoolLevel">
   <html:option value="">ALL</html:option>
   <html:options property="schoolLevel" />
</html:select> 

由于代码的当前设计，我需要将其作为 TreeSet 来执行，而不是将其更改为 map 列表。请问可以吗？

Answer 1

您可能正在寻找 optionsCollection tag :

Renders a set of HTML <option> elements, representing possible choices for a <select> element. This tag can be used multiple times within a single <html:select> element, either in conjunction with or instead of one or more or <html:options> elements.

This tag operates on a collection of beans, where each bean has a label property and a value property. The actual names of these properties can be configured using the label and value attributes of this tag.