Spring表单绑定到c：forEach里面 [英] Spring form binding to Set inside c:forEach

问题描述

我在我的JSP中使用Spring 表单表单绑定。我的命令对象包含一个 Set ，我想使用JSTL < c：forEach> 和为我的集合中的每个对象创建一个Spring < form：input> 。我已经看过如何使用列表：

I am using the Spring form tag library for form binding in my JSP. My command object contains a Set and I would like to iterate over that set using JSTL <c:forEach> and create a Spring <form:input> for each object in my set. I have seen how to do this with List:

<form:form>
  <c:forEach items="${itemList}" var="item" varStatus="status" >
    <form:input path="itemList[${status.index}].name" />
  </c:forEach>
</form:form>

我的问题是我使用无序的 Set 我不相信我可以使用索引属性。将 Set 的内容添加到Spring绑定表单中的最佳做法是什么？我想我只需要转换为列表，但我对任何可能的替代方案感兴趣。

My problem is that I am using an unordered Set and I don't believe that I can use the index property. What is the best practice for adding the contents of a Set to a Spring-bound form? I think I just need to convert to a List, but I am interested in any possible alternatives.

推荐答案

您的表单支持对象应该包含列表中的这些数据。迭代次序不能保证意味着任何事情 - 当然没有一套索引的概念，因此迭代集合没有什么意义。我想象你可能有一定的期望顺序，这些元素出现在页面上。

Your form-backing object should contain this data in a List, really. It doesn't make much sense to iterate over the set as the iteration order is not guaranteed to mean anything - and of course there is no concept of an index for a Set. I would imagine you probably have a certain desired order for these elements to appear on the page.

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