遇到这个问题怎么办，
<%@ page import="bean.Student" %>
<%@ page import="java.util.List" %>
<%@ page import="utils.PageBean" %><%--
Created by IntelliJ IDEA.
User: 贺雷
Date: 2023/6/6
Time: 8:36
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
<style>
table tr td{
text-align: center;
}
form input{
width: 80px;
}
</style>
</head>
<body>
<h1 align="center">学生管理系统</h1>
<%
List<Student> info= (List<Student>) request.getAttribute("info");//Servlet里面的info是所有成绩，是集合
PageBean pageBean =(PageBean) request.getAttribute("pagebean");
%>
<div align="center">
<form action="pageAllInfo2">
<label>
姓名:<input type="text" name="username" value="<%=pageBean.getName()%>">
</label>
<label>
成绩:<input type="text" name="scoreFrom" value="<%=pageBean.getScoreFrom()%>">-<input type="text" name="scoreTo" value="<%=pageBean.getScoreTo()%>">
</label>
<label>
班级:<input type="text" name="cid" value="<%=pageBean.getCid()%>">
<%-- 这个value是让跳出去的javabean留下来--%>
</label>
<button type="submit">查询</button>
</form>
<table border="1" cellspacing="0">
<tr>
<td>编号</td>
<td>姓名</td>
<td>密码</td>
<td>性别</td>
<td>成绩</td>
<td>班级</td>
<td>电话</td>
<td>年龄</td>
<td>操作</td>
</tr>
<%
for(Student s:info){
%>
<tr>
<td><%=s.getSno()%></td>
<td><%=s.getName()%></td>
<td><%=s.getPassword()%></td>
<td><%=s.getSex()%></td>
<td><%=s.getScore()%></td>
<td><%=s.getCid()%></td>
<td><%=s.getPhone()%></td>
<td><%=s.getAge()%></td>
<td><a href="updateEdit?id=<%s.getSno();%>">修改</a> ||<a href="delete?id=<%s.getSno();%>">删除</a></td>
</tr>
<%
}
%>
<tr>
<td>
<a href="add.jsp">添加</a>
</td>
</tr>
</table>
<div>
<a href="pageAllInfo?pageNum=1">首页</a>
<a href="pageAllInfo?pageNum=<%=pageBean.getPageNum()>1?pageBean.getPageNum()-1:1%>">上一页</a>
<a href="pageAllInfo?pageNum=<%=pageBean.getPageNum()<pageBean.getTotalPages()?pageBean.getPageNum()+1:pageBean.getTotalPages()%>"下一页</a>
<a href="pageAllInfo?pa">尾页</a>
第 / 页
</div>
</div>
</body>
</html>
