struts选择具有数组列表值的标记

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 标签）。我需要在动作类中使用arraylist值填充值。我怎样才能做到这一点？ structs.xml 文件需要进行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">

行动类：

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

表示选择 tag无法将 departmentlist 解析为集合。这是一个OGNL表达式，它试图在值堆栈中找到 departmentlist ，如果找不到或包含 null 引用选择标签会抱怨。当您呈现选择标记时，请确保列表位于值堆栈中并进行初始化。请参阅示例。

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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