8周
1.登陆
输入用户名密码,判断用户名和密码相同,登陆成功,session中保存用户的用户名,进入主页main.jsp,主页有一个退出按钮,点击,回到登陆页login.jsp。要求:退出登录后,如果在浏览器直接输入主页main.jsp,访问不了,直接跳到登陆页。
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> </head> <body> <form action="MyJsp.jsp" method="post" name="eight"> 请输入账号:<input name="name" type="text"/><br/> 请输入密码:<input name="password" type="password"/><br/> <input type="button" value="登录" onclick="denglu()"/> <script type="text/javascript"> function denglu(){ if(eight.name.value==""){ alert("账号不能为空!"); return; } if(eight.password.value==""){ alert("密码不能为空!"); return; } eight.submit(); } </script> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> </head> <body> <% request.setCharacterEncoding("utf-8"); String name = request.getParameter("name"); String password = request.getParameter("password"); if (name.equals(password)) { session.setAttribute("name", name); request.getRequestDispatcher("1.jsp") .forward(request, response); } else { request.getRequestDispatcher("2.jsp").forward(request, response); } %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> </head> <body> <% String name = (String) session.getAttribute("name"); if (name == null) { response.sendRedirect("Interface1.jsp"); } %> 欢迎你<%=name%><br> <br> <form action="3.jsp"> <input type="submit" value="退出登录"> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> 登录失败 </body> </html>
<%@ 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> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>退出界面</title> </head> <body> <% session.invalidate(); response.setHeader("refresh", "0;url=1.jsp"); %> </body> </html>