为什么session.getAttribute("loginUser")!=null却获取不到用户名
dologin.jsp代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
String username ="";
String password ="";
//request.setCharacterEncoding("utf-8");//防止中文乱码
username = request.getParameter("username");
password = request.getParameter("password");
//如果用户和密码都等于admin,则登录成功
if("admin".equals(username)&&"admin".equals(password)) {
session.setAttribute("loginUser", username);//保存登陆的用户名
request.getRequestDispatcher("login_success.jsp").forward(request, response);//服务器内部转发
}else {
response.sendRedirect("login_failure.jsp");//请求重定向
}
%>login_success.jsp的如下代码显示session.getAttribute("loginUser")!=null
<div id="box">
<%
String loginUser = "";
if(session.getAttribute(loginUser)!=null){
out.print("dsdasa");
loginUser = session.getAttribute("loginUser").toString();
}else{
out.print("4515");
out.print(session.getAttribute("loginUser"));
}
%>
登陆成功！欢迎<%=loginUser%><br>
<%=request.getParameter("username") %>
</div>输出显示else里面的内容，4515admin
