JSP第六次作业
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。
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）
<%@ 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 'index.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"> --> <body> <script> function yz() { if (form.user.value == "") { alert('用户名不能为空'); return; } if (form.password.value == "") { alert('密码不能为空'); return; } form.submit(); } </script> <form action="index2.jsp" method="post" name="form"> <table> <tr> <td>用户名：</td> <td><input type="text" name="user"></td> </tr> <tr> <td>密码：</td> <td><input type="password" name="password"></td> </tr> <tr> <td><input type="button" value="登录" onclick="yz()"></td> </tr> </table> </form> </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 user = request.getParameter("user"); String password = request.getParameter("password"); if (user.equals(password)) { session.setAttribute("user", user); request.getRequestDispatcher("B.jsp").forward(request,response); } else { response.sendRedirect("index.jsp"); } %> </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> </head> <body> <% String user = (String) session.getAttribute("user"); if (user == null) { response.sendRedirect("index.jsp"); } %> 欢迎：<%=user%> <a href="C.jsp">退出登录</a> <form action="D.jsp" method="post"> <table border="1" cellpadding="0" cellspacing="0" width="500"> <thead> <tr> <th>商品名称</th> <th>价格</th> <th>加购</th> </tr> </thead> <tbody> <tr> <td>外套</td> <td>99</td> <td align="center"><input type="checkbox" name="sp" value="外套"> </td> </tr> <tr> <td>裙子</td> <td>88</td> <td align="center"><input type="checkbox" name="sp" value="裙子"> </td> </tr> <tr> <td>裤子</td> <td>77</td> <td align="center"><input type="checkbox" name="sp" value="裤子"> </td> </tr> <tr> <td>T恤</td> <td>66</td> <td align="center"><input type="checkbox" name="sp" value="T恤"> </td> </tr> <tr> <td>衬衫</td> <td>55</td> <td align="center"><input type="checkbox" name="sp" value="衬衫"> </td> </tr> <tr> <td>吊带</td> <td>44</td> <td align="center"><input type="checkbox" name="sp" value="吊带"> </td> </tr> <tr> <td>短裤</td> <td>33</td> <td align="center"><input type="checkbox" name="sp" value="短裤"> </td> </tr> <tr> <td colspan="3"><input type="submit" value="加购"> </td> </tr> </tbody> </table> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <% session.invalidate(); response.sendRedirect("index.jsp"); %> </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> </head> <body> <% request.setCharacterEncoding("utf-8"); String[] sp = request.getParameterValues("sp"); for (int i = 0; sp != null && i < sp.length; i++) { out.print(sp[i] + "<br>"); } %> </body> </html>
