JSP第六次作业
------------恢复内容开始------------
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>index.jsp</title> </head> <body> <form action="index2.jsp" method="post" name="index"> 请输入账号：<input name="name" type="text"/><br/> 请输入密码：<input name="password" type="password"/><br/> <input type="button" value="登录" onclick="denglu()"/> <script type="text/javascript"> function denglu(){ if(index.name.value==""){ alert("账号不能为空！"); return; } if(index.password.value==""){ alert("密码不能为空！"); return; } index.submit(); } </script> </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>index2.jsp</title> </head> <body> <% String name=request.getParameter("name"); String password=request.getParameter("password"); if(name.equals(password)){ session.setAttribute("yhm", name); 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>main.jsp</title> </head> <body> <% String name=(String) session.getAttribute("yhm"); if(name==null){ out.print("未登录，3秒后跳转登录页！"); response.setHeader("refresh", "3;url=index.jsp"); } else{ out.print("用户名："+name+"登陆成功！"); %> <form action="tuichu.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>tuichu.jsp</title> </head> <body> <h3>退出成功，3秒后返回登录页！</h3> <% session.invalidate(); response.setHeader("refresh", "3;url=index.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>no.jsp</title> </head> <body> <h3>登陆失败，3秒后返回登陆页</h3> <% session.invalidate(); response.setHeader("refresh", "3;url=index.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>no.jsp</title> </head> <body> <h3>登陆失败，3秒后返回登陆页</h3> <% session.invalidate(); response.setHeader("refresh", "3;url=index.jsp"); %> </body> </html>
2.购物车
和上一题一起，在main.jsp中做一个商品展示，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show.jsp 。（选作：在购物车show.jsp中加删除按钮删除商品）
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>index</title> </head> <body> <h1>登陆成功！</h1> <% 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"); %> <form action="show.jsp" method="post"> 商品：<br> <br> 苹果 5.45<input type="checkbox" name="item" value="苹果">加入购物车 <br> 梨 4.34 <input type="checkbox" name="item" value="梨"> 加入购物车 <br> 香蕉 4.56<input type="checkbox" name="item" value="香蕉"> 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>
<%@ 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>
------------恢复内容结束------------
