第八周作业
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>登录</title> </head> <body> <script type="text/javascript"> function validate(){ if(loginForm.uname.value == ""){ alert("账号不能为空!"); return; } if(loginForm.upwd.value == ""){ alert("密码不能为空!"); return; } loginForm.submit(); } </script> <form action="dologin.jsp" name="loginForm" method="post"> <table border="0" cellpadding="10"> <tr><td>用户名:</td> <td><input type="text" name="uname"></td> </tr> <tr><td>密码:</td> <td><input type="password" name="upwd"></td> </tr> <tr> <td><input type="button" value="登录" onclick="validate()"></td> </tr> </table> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% request.setCharacterEncoding("UTF-8"); String uname = request.getParameter("uname"); String upwd = request.getParameter("upwd"); if(upwd.equals(uname)){ session.setAttribute("uname", uname); request.getRequestDispatcher("main.jsp").forward(request, response); }else{ response.sendRedirect("login.jsp"); } %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>登录Two</title> </head> <body> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String uname = (String) session.getAttribute("uname"); if (uname == null) { response.sendRedirect("login.jsp"); } else { out.print("欢迎" + uname + "登录!"); } %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> </head> <body> <a href="login.jsp">退出登录</a> </body> </html>
2.购物车
和上一题一起,在main.jsp中做一个购物车,里面显示3个商品名和价格 每一个后面有一个加入购物车按钮,main.jsp中有一个按钮(或者超链接)可以显示购物车。(选作:在购物车中加删除按钮删除商品)