第八周作业
1、登陆 login.jsp
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。
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"%> <html> <head> <title>first</title> </head> <body> <script type="text/javascript"> function check(){ if(login.account.value=="") { alert("请输入账号"); return; } else if(login.password.value=="") { alert("请输入密码"); return; } login.submit(); }</script> <h3>登录</h3> <form action="check.jsp"> 账号:<input type="text" name="account"><br> 密码:<input type="password" name="password"><br> <input type="checkbox" value="注册会员">注册会员 <input type="checkbox" value="不注册会员">不注册会员<br> <input type="submit" value="登录"> </form> <% %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>check</title> </head> <body><% String account=request.getParameter("account"); String password=request.getParameter("password"); if(password.equals(account)){ session.setAttribute("account",account); request.getRequestDispatcher("Login3.jsp").forward(request,response) ;} else{ request.getRequestDispatcher("login2.jsp").forward(request,response); }%> <br> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>登陆成功</title> </head> <body> <h2>登录成功</h2> <a href="LoginOut.jsp">退出登录</a> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>登陆失败</title> </head> <body> <h1>登陆失败!</h1> </body> </html>
2、购物车
和上一题一起,在main.jsp中做一个商品展示,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show.jsp 。(选作:在购物车show.jsp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> <title>My JSP 'index.jsp' starting page</title> </head> <body> <% String uname = (String) session.getAttribute("uname"); //如果他是空,说明没登陆,直接访问该页面了 if (uname == null) response.sendRedirect("login.jsp"); %> 欢迎你<%=uname%><br> <br> <a href="quit.jsp">退出登录</a> <hr> 商品展示: <br> 欢迎进入水果商城: <br> <hr> <form action="show.jsp" method="post"> 请选择要加入购物车的商品:<br> <input type="checkbox" name="list" value="荔枝"> 荔枝 9.99/kg<br> <input type="checkbox" name="list" value="桃子"> 桃子 6.88/kg<br> <input type="checkbox" name="list" value="西瓜"> 西瓜 7.99/kg<br> <hr> <input type="submit" value="加入购物车"> </form> </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> <title>My JSP 'index.jsp' starting page</title> </head> <body> <h2>购物车添加的商品有:</h2> <% request.setCharacterEncoding("utf-8"); String listName[] = request.getParameterValues("list"); if (listName == null) { out.print("购物车为空!"); } else { for (int i = 0; i < listName.length; i++) { out.print("(" + (i + 1) + ")" + listName[i] + "<br>"); } } %> </body> </html>