Session取值为空的问题

Question

jsp1的代码：<%@ page language="java" import="java.util.*" pageEncoding="utf-8" import="java.sql.*" %>
<%request.setCharacterEncoding("utf-8");%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
/jsp:useBean

登陆验证

<%
String userID=request.getParameter("userID");
String password0=request.getParameter("password");
buyer.setMemberID(userID);
buyer.setPwd(password0);
%>
<%int logonTimes=buyer.getLogontimes();
if(logonTimes>0)
{
session.setAttribute("userID", userID); %>

<%=buyer.getMemberName() %>欢迎你第<%=logonTimes+1 %>次来到本书店

进入书店<%=session.getAttribute("userID")%>

<%}
else
{
%>

对不起,<%=userID %>你的用户名和密码不一致

重新登陆

<%
}
%>

jsp2的代码

/jsp:useBean
<%
if(session.getAttribute("userID")==null){ %>

请先登录，然后再选书

登陆

<%}
else
{ %>



为什么jsp2取值为null?

书名<%session.getAttribute("userID"); %>

Answer 1

书名<%=session.getAttribute("userID"); %>
或{session.getAttribute("userID")}