<?xml?version="1.0"?encoding="UTF-8"??>
<!DOCTYPE?struts?PUBLIC?"-//Apache?Software?Foundation//DTD?Struts?Configuration?2.1//EN"
?"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

??<package?name="default"?namespace="/"?extends="struts-default">
??
??</package>
?<package?name="users"?namespace="/users"?extends="default">
?<action??name="*_*"?class="action.{1}Action"?method="{2}">
????<result?name="login_success">/users/Users_login_success.jsp</result>
??????<result?name="login_failure">/users/Users_login.jsp</result>
??????<result?name="logout_success">/users/Users_login.jsp</result>
??????<result?name="input">/users/Users_login.jsp</result>
?</action>
??
?</package>
?

?<!--?在tree.jsp中把treeMenu的學生列表的link改為Action就可以了?????students/Students_query.action-->
??<package?name="students"?namespace="/students"?extends="default">
?????<action?name="*_*"??class="action.{1}Action"??method="{2}">
??????<result?name="query_success">students/Students_query_success.jsp</result>
?????</action>
??</package>
???
</struts>

<script?type="text/javascript">?
var?treeMenu?=?[
	{?level:1,?name:"學生管理"},
	{?level:2,?name:"學生列表",?ico:"images/icon_default.gif",link:"students/Students_query.action"},
	{?level:1,?name:"教師管理"},
	{?level:2,?name:"教師列表",?ico:"images/icon_default.gif",link:"role_list.html"},
	{?level:1,?name:"信息管理"},
	{?level:2,?name:"新聞管理",?ico:"images/icon_default.gif",link:"news_list.html"},
	{?level:2,?name:"公告管理",?ico:"images/icon_default.gif",link:"bulletin_list.html"},
	{?level:1,?name:"系統郵件",?ico:"images/icon_default.gif"},
	{?level:1,?name:"網絡文件",?ico:"images/icon_default.gif",link:"complaint_list.html"}
];
</script>

package?action;

import?java.util.List;

import?entity.Students;

import?service.StudentsDao;
import?service.Impl.StudentsDaoImpl;

public?class?StudentsAction?extends?SuperAction{
??????/**
	?*?
	?*/
	private?static?final?long?serialVersionUID?=?1L;

	public?String?query(){
????	??StudentsDao?sdao=new?StudentsDaoImpl();
????	List<Students>?list=sdao.queryAllStudents();
????	if(list!=null?&&?list.size()>0){
????	????session.setAttribute("Students_list",?list);
????	????//return?"query_success";
????	}
????	??return?"query_success";
??????}
}

我除了和老師的項目名不一樣 ?其他的都一樣 ? 為什么會報這種錯誤 ?