JSP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"%> <% 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> <form action="doreg.jsp" method="post"> 用户名:<input type="text" name="uname" value=""><br> 密码: <input type="password" name="upwd" value=""><br> <input type="submit" value="登录"><br> </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> </head> <body> <% request.setCharacterEncoding("utf-8"); String uname=request.getParameter("uname"); String upwd=request.getParameter("upwd"); if(uname.equals("admin")&&upwd.equals("admin")){ session.setAttribute("uname",uname); response.sendRedirect("main.jsp"); } else{ response.sendRedirect("fault.jsp"); } %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> <% String uname=(String)session.getAttribute("uname"); if(uname==null){ response.sendRedirect("login.jsp"); } %> 欢迎<%=uname %> <a href="loginout.jsp">退出登录</a> </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> 退出成功! <% session.invalidate(); response.setHeader("refresh","5;url=login.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> 登录失败! <% 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"%> <% 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> <form action="doreg.jsp" method="post"> 用户名:<input type="text" name="uname" value=""><br> 密码: <input type="password" name="upwd" value=""><br> <input type="submit" value="登录"><br> </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> </head> <body> <% request.setCharacterEncoding("utf-8"); String uname=request.getParameter("uname"); String upwd=request.getParameter("upwd"); if(uname.equals("admin")&&upwd.equals("admin")){ session.setAttribute("uname",uname); response.sendRedirect("main.jsp"); } else{ response.sendRedirect("fault.jsp"); } %> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> <% request.setCharacterEncoding("utf-8"); String uname=(String)session.getAttribute("uname"); if(uname==null){ response.sendRedirect("login.jsp"); } %> 欢迎<%=uname %> <form action="buy.jsp" method="post"> 苹果 <input type="checkbox" name="sp" value="苹果"><a href="">加入购物车</a> <br> 香蕉 <input type="checkbox" name="sp"value="香蕉"><a href="">加入购物车</a> <br> 樱桃 <input type="checkbox" name="sp" value="樱桃"><a href="">加入购物车</a> <br> <input type="submit" value="购物车"> </form> <a href="loginout.jsp">退出登录</a> </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> </head> <body> <% request.setCharacterEncoding("utf-8"); String spName[]=request.getParameterValues("sp"); if(spName==null){ out.print("未添加购物车"); }else{ for(int i=0;i<spName.length;i++){ out.print("("+(i+1)+")"+spName[i]+"<br>"); } } %> </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> 退出成功! <% session.invalidate(); response.setHeader("refresh","5;url=login.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> 登录失败! <% session.invalidate(); response.setHeader("refresh","5;url=login.jsp"); %> </body> </html>