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"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'login.jsp' starting page</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>My JSP 'dologin.jsp' starting page</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>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'main.jsp' starting page</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"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'no.jsp' starting page</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="ISO-8859-1"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'logout.jsp' starting page</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></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("1.login.jsp"); %> <a href="1.out.jsp">退出登录</a> <br> <h2>欢迎进入</h2> <form action="2.show.jsp"> <hr> 是否加入购物车？<br> <input name="item" type="checkbox" value="chengzi"> 橙子 $1<br> <input name="item" type="checkbox" value="pingguo"> 苹果 $2<br> <input name="item" type="checkbox" value="caomei"> 草莓 $3<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></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> 登陆失败，请重试！ <% response.setHeader("refresh", "5;url=1.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("1.main.jsp").forward(request, response); } else { response.sendRedirect("1.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=1.login.jsp"); %> 退出成功! </body> </html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <html> <head> <title></title> </head> <body> <h2>购物车</h2> <% request.setCharacterEncoding("utf-8"); String itemName[]=request.getParameterValues("item"); if(itemName==null){ out.print("购物车为空"); } else{ for(int k=0;k<itemName.length;k++){ out.print("("+(k+1)+")"+itemName[k]+"<br>"); } } %> </body> </html>
