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>login</title> </head> <body> <form name="form" action="dologin.jsp" method="post"> 账号:<input type="text" name="usernaem"><br> 密码:<input type="password" name="psw"><br> <input type="submit" value="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> <title>dologin</title> </head> <body> <% request.setCharacterEncoding("utf-8"); String usernaem=request.getParameter("usernaem"); String psw=request.getParameter("psw"); if(usernaem.equals(psw)){ session.setAttribute("usernaem", usernaem); request.getRequestDispatcher("main.jsp").forward(request,response); }else{ request.getRequestDispatcher("no.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> <title>main</title> </head> <body> <h1>登陆成功!</h1> <% String usernaem = (String) session.getAttribute("usernaem"); if (usernaem == null) response.sendRedirect("login.jsp"); %> <form name="form1" action="logout.jsp" method="post"> <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> <title>logout</title> </head> <body> <% session.invalidate(); response.setHeader("refresh", "5;url=login.jsp"); %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>no</title> </head> <body> <h1>登陆失败!!</h1> <%response.setHeader("refresh", "5;url=login.jsp");%> </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)
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>main</title> </head> <body> <% String usernaem = (String) session.getAttribute("usernaem"); if (usernaem == null) response.sendRedirect("login.jsp"); %> 欢迎光临 <hr> 商品展示: <br> <form action="gouwuche.jsp" method="post"> 请选择要加入购物车的商品:<br> 牛肉饭 ¥30 <input type="checkbox" name="list" value="牛肉饭"> <br> 黄焖鸡 ¥25 <input type="checkbox" name="list" value="黄焖鸡"> <br> 汤面 ¥16 <input type="checkbox" name="list" value="汤面"> <br> <hr> <input type="submit" value="加入购物车"> <a href="logout.jsp">退出登录</a> </form> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <h2>购物车中的商品有:</h2> <% request.setCharacterEncoding("utf-8"); String listName[] = request.getParameterValues("list"); if (listName == null) { out.print("你没有选购物品"); } else { for (int i = 0; i < listName.length; i++) { out.print("(" + (i + 1) + ")" + listName[i] + "<br>"); } } %> </body> </html>
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