如何在Struts 2中的Set集合中插入值 [英] How to insert a value into Set collection in Struts 2

问题描述

我正在使用Struts2做一个项目，我在分配集合时遇到问题。

I am doing a project using Struts2 and I have a problem assigning a set collection.

这是我的行动（我删除了无关的部分）

Here's my Action (I eliminated the irrelevant part)

public class TeamAction extends BaseAction implements ModelDriven<Team>
{
 Team team=new Team();

}

这是我的模特团队（我删除了无关的部分）

Here's my model Team (I eliminated the irrelevant part)

private TeamId id;
private Set students = new HashSet(0);

这是我的JSP部分

<input type="text" name=team.student[0].id />

现在的问题是我无法在此集中插入正确的值通过 ModelDriven 收集，它会抛出异常。你能告诉我在JSP文件中写什么，所以我可以在我的模型中向 Set 集合插入一个值吗？

Now the problem is I can't insert the right value into this Set collection in by ModelDriven, it will throw a exception. Could you please tell me what to write in JSP file, so I can insert a value to Set collection in my model?

推荐答案

设置是一个集合和任何其他集合可能是由财产索引。

Set is a Collection and as any other collection could be indexed by a property.

@Element(value = Student.class)
@Key(value = Integer.class)
@KeyProperty(value = "id") 
@CreateIfNull(value = true)
private Set<Student> students = new HashSet(0);
//getter and setter, also for Student class that should have Integer id.

JSP中的

in JSP

<s:iterator value="students " var="student">
  <s:textfield name="students(%{#student.id}).name" />
</s:iterator>

有关此内容的更多信息，请参阅通过该集合的属性索引集合。

More about this see in Indexing a collection by a property of that collection.

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