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。
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"> 用户名:<input type="text" name="uname"><br> 密码:<input type="password" name="upwd"><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>main</title> </head> <body> <h1>登陆成功!</h1> <% String uname = (String) session.getAttribute("uname"); if (uname == null) response.sendRedirect("login.jsp"); %> <form name="form1" action="loout.jsp" method="post"> <input type="submit" value="退出登录"> </form> </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>
<%@ 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>
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" %> <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%> <a href= "logout.jsp" >退出登录</a> <hr> 商品展示: <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= "苹果" > 苹果 ¥ 9.9 <br> <input type= "checkbox" name= "list" value= "橙子" > 橙子 ¥ 7.88 <br> <input type= "checkbox" name= "list" value= "橘子" > 橘子 ¥ 6.88 <br> <hr> <input type= "submit" value= "加入购物车" > </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> |