Struts 2选择带有数组列表值的标签 [英] Struts 2 select tag with values of a array list

问题描述

我正在开发一个简单的 struts 应用程序.在我的 JSP 中，我有一个下拉列表框(使用 s:select 标记).我需要在操作类中使用数组列表值填充值.我怎样才能做到这一点?structs.xml 文件中需要哪些更改才能完成此操作?

I am developing a simple struts application. In my JSP I have a dropdown list box (using s:select tag). I need to fill the values with a arraylist values in the action class. How can I do that? what changes needed in the structs.xml file for complete this?

JSP:

<s:select name="department" label="" list="departmentlist"  headerKey="-1" headerValue="Select Department">

动作类:

private List<String> departmentlist = new ArrayList<String>();

public String xyz()
{
    departmentlist.add("aaa");
    departmentlist.add("bbb");
    departmentlist.add("ccc");
    departmentlist.add("ddd");
    return "success";
}

推荐答案

错误

"请求的列表键 'departmentlist' 无法解析为集合/数组/映射/枚举/迭代器类型.示例:人或people.{name} - [未知位置] "

"The requested list key 'departmentlist' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location] "

表示 select 标记无法将 departmentlist 解析为集合.它是一个 OGNL 表达式，它试图在值堆栈中找到 departmentlist，如果它没有找到或包含 null 引用 select 标记会抱怨.当您呈现 select 标记时，请确保列表位于值堆栈中并已初始化.请参阅此处的示例.

means that the select tag is not able to resolve departmentlist as a collection. It is an OGNL expression which is trying to find the departmentlist in the value stack and if it not found or contains a null reference the select tag will complain. When you render the select tag make sure the list is in the value stack and is initialized. See the example here.

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