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"%> <html> <head> <title></title> <script type="text/javascript"> function v() { if (loginForm.uname.value=="") { alert("账号不能为空!"); return; } if (loginForm.password.value=="") { alert("密码不能为空!"); return; } loginForm.submit(); } </script> </head> <body> <form name="loginForm" action="1.oblogin.jsp" method="post"> 账号:<input type="text" name="uname"><br> 密码:<input type="password" name="password"> <br> <input type="submit" value="登录" onclick="v()"> </form> </body></html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title></title> </head> <body> <% String uname=(String)session.getAttribute("uname");if(uname==null) response.sendRedirect("login.jsp"); %> <a href="1.out.jsp">退出登录</a> <br>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html><head><title></title></head><body> 登陆失败,请重试! <% response.setHeader("refresh", "5;url=login.jsp"); %></body></html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html><head><title></title></head><body> <% request.setCharacterEncoding("utf-8"); String uname = request.getParameter("uname"); String password = request.getParameter("password"); if (uname.equals(password)) { session.setAttribute("uname", uname); request.getRequestDispatcher("main.jsp").forward(request, response); } else { response.sendRedirect("false.jsp"); } %> </body></html><%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html><head><title></title></head><body> <% request.setCharacterEncoding("utf-8"); String uname = request.getParameter("uname"); String password = request.getParameter("password"); if (uname.equals(password)) { session.setAttribute("uname", uname); request.getRequestDispatcher("main.jsp").forward(request, response); } else { response.sendRedirect("false.jsp"); } %> </body></html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title></title> </head> <body> <% session.invalidate(); response.setHeader("refresh", "5;url=login.jsp"); %> 退出成功! </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></title></head> <body> <% String uname = (String) session.getAttribute("uname"); if (uname == null) response.sendRedirect("login.jsp"); %> 欢迎你<%=uname%> <a href="logout.jsp">退出登录</a> <br> 玉米¥10<a href="buy.jsp?sgname=1">购买</a><br> 土豆¥9.9<a href="buy.jsp?sgname=2">购买</a><br> </body></html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><html><head><title></title></head><body> <% ArrayList books = (ArrayList) session.getAttribute("sgs"); if (sgs == null) { sgs = new ArrayList(); session.setAttribute("sgs",sgs); } String sgname = request.getParameter("sgname"); String sg01="玉米,价格:20元"; String sg02="土豆,价格:30元"; if (sgname != null) { sgname = new String(sgname.getBytes("ISO-8859-1"), "utf-8"); if(sgname.equals("1")){ sgs.add(sg01); }else{ books.add(book02); } } String delete = request.getParameter("delete"); if (delete != null) { int i = Integer.parseInt(delete); sgs.remove(i); } %> 购物车中的信息为: <br> <% int i = 0; for (i = 0; i <sgs.size(); i++) { %> <a href="buy.jsp?delete=<%=i%> ">删除</a> <% out.println(sgs.get(i) + "<br>"); } %> <a href="main.jsp">返回主页面</a></body></html>