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。
login,jsp
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<%@ 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 > |
dologin,jsp
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<%@ 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 uname=request.getParameter("uname"); String upwd=request.getParameter("upwd"); if(uname.equals(upwd)){ session.setAttribute("uname", uname); request.getRequestDispatcher("main.jsp").forward(request,response); }else{ request.getRequestDispatcher("no.jsp").forward(request,response); } %> </ body > </ html > |
main.jsp
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<%@ 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 > |
no.jsp
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<%@ 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 > |
logout.jsp
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<%@ 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)
main.jsp
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<%@ 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 action="show.jsp" method="post"> 商品:< br > < br > 可乐 3.50< input type="checkbox" name="item" value="可乐">加入购物车 < br > 瓜子 6.00 < input type="checkbox" name="item" value="瓜子"> 加入购物车 < br > 矿泉水 1.00< input type="checkbox" name="item" value="矿泉水"> 加入购物车< br >< br > < input type="submit" value="加入购物车"> </ form > < form name="form1" action="logout.jsp" method="post"> < input type="submit" value="退出登录"> </ form > </ body > </ html > |
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<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> < html > < head > < title >show</ title > </ head > < body > <% request.setCharacterEncoding("utf-8"); String itemName[]=request.getParameterValues("item"); if(itemName==null){ out.print("未添加购物车"); }else{ for(int i=0;i< itemName.length ;i++){ out.print((i+1)+"."+itemName[i]+"<br>"); } } %> </ body > </ html > |