ssh javaee中关于<s:select>标签访问数据库问题
老是报错Therequestedlistkey'categoryList'couldnotberesolvedasacollection/array/map/enumer...
老是报错
The requested list key 'categoryList' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
怀疑是类型转换的问题？？
主要代码如下
jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<s:form action="addNews" method="post">
<s:select list="categoryList" listKey="name" listValue="id" />
</s:form>
</body>
</html>
action中
public class NewsAction
{
private News news;
private Category cat;
private NewsService newsService;
private CategoryService categoryService;
private List<Category> categoryList;
+get， set方法
public String add()
throws Exception
{
List<Category> list=new ArrayList<Category>();
list=categoryService.findAllCategory();
this.setCategoryList(list);
}
}
Category bean类
public class Category {
private Integer id;
private String name;
private String code;
private java.util.Date createDate;
+get set
} 展开
The requested list key 'categoryList' could not be resolved as a collection/array/map/enumeration/iterator type. Example: people or people.{name} - [unknown location]
怀疑是类型转换的问题？？
主要代码如下
jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<s:form action="addNews" method="post">
<s:select list="categoryList" listKey="name" listValue="id" />
</s:form>
</body>
</html>
action中
public class NewsAction
{
private News news;
private Category cat;
private NewsService newsService;
private CategoryService categoryService;
private List<Category> categoryList;
+get， set方法
public String add()
throws Exception
{
List<Category> list=new ArrayList<Category>();
list=categoryService.findAllCategory();
this.setCategoryList(list);
}
}
Category bean类
public class Category {
private Integer id;
private String name;
private String code;
private java.util.Date createDate;
+get set
} 展开
2个回答
展开全部
用下s:debug看下categoryList是否在valuestack中
或者<s:property value="#catagoryList">输出下
或者<s:property value="#catagoryList">输出下
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不在valuestack中 怎么办？
追答
试试输出的是什么
或者
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展开全部
<s:select id="Select" name="Select" list="%{mylist}" listValue="name" listKey="userID" value="%{#request.cid}"/>
value是默认选中的
value是默认选中的
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改成这个么
还是报错
追答
改成value=""试试，你后台又没有传request.cid过来，应该是取不到的，我前面只是给你举个例子。
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