jsp技术之购物车---buy.jsp

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<%@ page language="java" import="java.util.*,shoppingcart.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'buy.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
    <%
     String id=request.getParameter("id");
    /* String name=request.getParameter("name");
     System.out.println(name);*/

     ArrayList <Product> list= (ArrayList)session.getAttribute("list");
     int n=0;
     if(list==null)
     {
     Product p=new Product();
     list=new ArrayList<Product>();
     if (id.equals("1"))
     {
     p.setId("1");
     p.setName("苹果");
     p.setDescription("富士山的苹果");
     p.setPrice(10);
     p.setNumber(1);
     }
     if (id.equals("2"))
     {
     p.setId("2");
     p.setName("香蕉");
     p.setDescription("海南香蕉");
     p.setPrice(5);
     p.setNumber(1);
     }
     if (id.equals("3"))
     {
     p.setId("3");
     p.setName("橘子");
     p.setDescription("驻马店橘子");
     p.setPrice(3);
     p.setNumber(1);
     }
     list.add(p);
     }

     else
     {
     Product p1=new Product();
     for(int i=0;i<list.size();i++)
     {
     p1=(Product)list.get(i);
     if(p1.getId().equals(id))
     {
     p1.setNumber(p1.getNumber()+1);
     n++;
     list.set(i,p1);
     break;
     }
        }
     if(n==0)
     {
     Product p2=new Product();
     if(id.equals("1"))
     {
     p2.setId("1");
     p2.setNumber(1);
     p2.setName("苹果");
     p2.setPrice(10);
     p2.setDescription("富士山的苹果");
     }
     if(id.equals("2"))
     {
     p2.setId("2");
     p2.setNumber(1);
     p2.setName("香蕉");
     p2.setPrice(5);
     p2.setDescription("海南香蕉");
     }
     if(id.equals("3"))
     {
     p2.setId("3");
     p2.setNumber(1);
     p2.setName("橘子");
     p2.setPrice(3);
     p2.setDescription("驻马店橘子");
     }
     list.add(p2);
     }
     }
     session.setAttribute("list",list);
     response.sendRedirect("show.jsp");
    %>
</body>
</html>

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