模拟淘宝购物，运用cookie，记录登录账号信息，并且记住购物车内所选的商品

1、登录界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
String name="";
//获取所有cookie
Cookie[] ck=request.getCookies();
if(ck!=null)
{
	//遍历
	for(Cookie co:ck)
	{
		if(co.getName().equals("name"))
		{
			name=co.getValue();
		}
	}
}
%>
请登录购物账号

<form action="Test.jsp" method="post">

账户：<input type="text" name="name" value="<%=name %>">
密码：<input type="password" name="password">

<input type="submit" value="点击登录">

</form>
</body>
</html>

2，验证登录

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%

response.setHeader("Cache-Control", "no-cache");

String name= request.getParameter("name");
String password=request.getParameter("password");
if(name == null || password == null || name.equals("") || password.equals(""))
{

		 out.write("请正确登录！");
	     response.setHeader("refresh", "2;url=Denglu.jsp");
}
else{
	//验证
	if(name.equals("1234")&&password.equals("123456"))
	{
		//用cookie记住账号
		//创建cookie
		Cookie coo=new Cookie("name",name);
		coo.setMaxAge(20*24*3600);
		response.addCookie(coo);

		//保持登录状态
		//创建session
		session.setAttribute("name", name);
		session.setMaxInactiveInterval(20*60);

		response.sendRedirect("Gouwuche.jsp");
	}
	else
	{
		out.write("用户名或密码错误");
	}

}
%>

</body>
</html>

3.购物界面

<%@page import="java.net.URLEncoder"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
淘宝首页
<br>
<%

Object obj=session.getAttribute("name");

if(obj==null)
{
	out.write("回话超时或未登录");
	response.setHeader("refresh", "2;url=Denglu.jsp");
}
else
{
	out.write(obj+",欢迎登录");

}
%>

<form action="Daoru.jsp" method="post">
       请输入您想要购买的商品名称：<input type="text" name="namesp" /><br/>
                		<input type="submit" value="加入购物车" /><br/>
 </form>
 <br>
 <a href="logout.jsp">退出</a>
</body>
</html>

4.退出界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
//销毁session
session.invalidate();

out.print("退出成功");

response.setHeader("refresh", "2;url=Denglu.jsp");

%>
</body>
</html>

5.创建cookie商品

<%@page import="java.net.URLEncoder"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%

String namesp=request.getParameter("namesp");
namesp=new String(namesp.getBytes("ISO-8859-1"),"UTF-8");
//设置cookie
Cookie coo = new Cookie("namesp", URLEncoder.encode(namesp) );//利用cookie记住购物车内的物品
//设置cookie的生命周期为10分钟
coo.setMaxAge(600);
//发送cookie
response.addCookie(coo);
//跳转页面到菜单选择
response.sendRedirect("ShangPin.jsp");

 %>

</body>
</html>

6.购物车内商品

<%@page import="java.net.URLDecoder"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
Object obj=session.getAttribute("name");
if(obj!=null)
{
	Cookie[] ck=request.getCookies();
	if(ck!=null)
	{
			for(int i =0 ;i<ck.length;i++){
	             if(ck[i].getName().equals("namesp")){
	              	 out.print(ck[i].getName() + "= " + URLDecoder.decode(ck[i].getValue()) + "<br/>");
	             }
	        }
	}
	else
	{
		out.write("购物车没有商品")	;
	}
}
else
{
	out.write("未登录");
}
%>
<a href="Gouwuche.jsp">返回进行购物</a>
</body>
</html>