用JSP和数据库做的购物车的源程序：（欢迎大家指点！）

答案：下面是我用JSP和数据库做的购物车的源程序：

注意：
1、重新计费部分还没有做好，大家自己动手吧！
2、下一版本将用session做。

//shop_cart.jsp

<%@ page contentType="text/html;charset=gb2312"%>
<%@ page session="true" %>
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="bka" scope="page" class="shop.bka" />
<%

String product_type;
String action;
int product_id;
int curpage;

//商品类型
if (request.getParameter("product_type")==null){
product_type="all";
}else{
product_type=request.getParameter("product_type");
}

//页数和商品类型参数，可以在“继续购物”时返回到上次购物的页面
if (request.getParameter("curpage")==null){
curpage=1;
}else{
curpage=java.lang.Integer.parseInt(request.getParameter("curpage"));
}

//动作
if (request.getParameter("action")==null){
action="view";
}else{
action=request.getParameter("action");
}

//商品编号
if (request.getParameter("product_id")==null){
product_id=0;
}else{
product_id=java.lang.Integer.parseInt(request.getParameter("product_id"));
}

int bbb;
bbb=1;

Integer num = new Integer(bbb);

//商店编号
session.putValue("shop_id",num);
//顾客username
session.putValue("guest_name","asp2001");

String guest_name=(String)session.getValue("guest_name");
Integer shop_id=(Integer)session.getValue("shop_id");



java.lang.String sql;       
java.sql.ResultSet rs;



if (action.compareTo("add")==0) {

sql="select cart_quantity from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;
rs = bka.executeQuery(sql);
if (rs.next()){
int cart_quantity;
cart_quantity=java.lang.Integer.parseInt(rs.getString("cart_quantity"))+1;
sql="update shop_cart set cart_quantity=" + cart_quantity + " where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;
rs = bka.executeQuery(sql);}
else
{
sql="insert into shop_cart (cart_shop_id,cart_guest_id,cart_product_id,cart_quantity) values ('" + shop_id + "','" + guest_name + "','" + product_id + "',1)";
rs = bka.executeQuery(sql);
}
}

if (action.compareTo("clear")==0) {
sql="delete from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "'";
rs = bka.executeQuery(sql);
}

if (action.compareTo("delete")==0) { 
sql="delete from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;
rs = bka.executeQuery(sql);
}
%>
<div align="center"><center>

<table border="0" cellpadding="0" cellspacing="0" width="610" 

height="2">
  <tr>
    <td><form method="POST" 

action="shop_cart.jsp?action=update&product_type=<%=product_type%>&curp

age=<%=curpage%>">
      <table border="0" cellpadding="0" cellspacing="0" width="610" 

height="2">
        <tr>
          <td width="122" height="7"><div align="center"><center><table 

border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468" 

bordercolordark="#FFFFFF" bgcolor="#FFB468">
            <tr>
              <td width="100%"><div 

align="center"><center><p>购物车</td>
            </tr>
          </table>
          </center></div></td>
          <td width="122" height="7" style="border: medium" 

align="center"><div align="center"><center><table
          border="1" cellpadding="2" cellspacing="0" width="100%" 

bordercolorlight="#FFB468"
          bordercolordark="#FFFFFF" bgcolor="#FFB468">
            <tr>
              <td width="100%"><div align="center"><center><p><a 

href=>
&curpage=<%=curpage%>">继续购物</a></td>
            </tr>
          </table>
          </center></div></td>
          <td width="122" height="7" style="border: medium" 

align="center"><div align="center"><center><table
          border="1" cellpadding="2" cellspacing="0" width="100%" 

bordercolorlight="#FFB468"
          bordercolordark="#FFFFFF" bgcolor="#FFB468">
            <tr>
              <td width="100%"><div align="center"><center><p><a 

href=>            </tr>
          </table>
          </center></div></td>
          <td width="122" height="7" style="border: medium" 

align="center"><div align="center"><center><table
          border="1" cellpadding="2" cellspacing="0" width="100%" 

bordercolorlight="#FFB468"
          bordercolordark="#FFFFFF" bgcolor="#FFB468">
            <tr>
   &n

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