1.login2：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><% ???String path = request.getContextPath(); ???String basePath = request.getScheme() + "://" ???????????+ request.getServerName() + ":" + request.getServerPort() ???????????+ path + "/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP ‘login2.jsp‘ starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"><meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!-- ???<link rel="stylesheet" type="text/css" href="styles.css"> ???--></head><body> ???<form action="JSP/login2_temp.jsp" method="post"> ???????<table> ???????????<tr> ???????????????<td>用户名：</td> ???????????????<td><input type="text" name="username" /> ???????????????</td> ???????????</tr> ???????????<tr> ???????????????<td>密码</td> ???????????????<td><input type="text" name="password" /></td> ???????????</tr> ???????????<tr> ???????????<td><input ?type="submit"/></td></tr> ???????</table> ???</form></body></html>
2.login_temp：（注意判断是否为空再加入session中）
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><% ???String path = request.getContextPath(); ???String basePath = request.getScheme() + "://" ???????????+ request.getServerName() + ":" + request.getServerPort() ???????????+ path + "/"; ???String username = ""; ???String password = ""; ???username = request.getParameter("username"); ???password = request.getParameter("password"); ???if(username!=null){ ???????session.setAttribute("loginuser", username); ???} ???if("admin".equals(username)&&"admin".equals(password)){ ???????request.getRequestDispatcher("login2_success.jsp").forward(request, response); ???}else{ ???????response.sendRedirect("login2_failure.jsp"); ???} ???%>3.login_seccess：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> ?<head> ???<base href="<%=basePath%>"> ???????<title>My JSP ‘login2_success.jsp‘ starting page</title> ???????<meta http-equiv="pragma" content="no-cache"> ???<meta http-equiv="cache-control" content="no-cache"> ???<meta http-equiv="expires" content="0"> ???????<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> ???<meta http-equiv="description" content="This is my page"> ???<!-- ???<link rel="stylesheet" type="text/css" href="styles.css"> ???--> ?</head> ???<body> ??<h1>欢迎<%=session.getAttribute("loginuser") %> 登陆成功</h1> ?</body></html>4.login2_failure:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> ?<head> ???<base href="<%=basePath%>"> ???????<title>My JSP ‘login2_failure.jsp‘ starting page</title> ???????<meta http-equiv="pragma" content="no-cache"> ???<meta http-equiv="cache-control" content="no-cache"> ???<meta http-equiv="expires" content="0"> ???????<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> ???<meta http-equiv="description" content="This is my page"> ???<!-- ???<link rel="stylesheet" type="text/css" href="styles.css"> ???--> ?</head> ???<body> ???<h1>登陆失败，请检查您的用户名和密码</h1> ?</body></html>
JSP内置对象阶段案例
原文地址：https://www.cnblogs.com/sunxiaoyan/p/8543263.html