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=updateproduct_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="shop_list.jsp?shop_id=%=shop_id%>product_type=%=product_type%>

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="javascript: document.forms[0].submit()">重新计费/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="shop_cart.jsp?action=clearproduct_type=%=product_type%>curpage=%=curpage%>">清空购物车/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="shop_order.asp">确认购买/a>/td>
/tr>
/table>
/center>/div>/td>
/tr>
tr align="center">
td width="610" height="1" colspan="5">div align="center">center>
table border="1" cellpadding="2" cellspacing="0" width="100%" bgcolor="#FDFEE2"  

bordercolorlight="#FFB468" bordercolordark="#FFFFFF" height="40">
tr>
td width="20%" height="8" align="left">商品名称/td>
td width="10%" height="8" align="left">市场价/td>
td width="10%" height="8" align="left">优惠价/td>
td width="10%" height="8" align="left">数量/td>
td width="14%" height="8" align="left">小计/td>
td width="12%" height="8" align="left">定金比例/td>
td width="17%" height="8" align="left">定金小计/td>
td width="17%" height="8" align="left">删除/td>
/tr>
%
sql="select shop_product.product_id,shop_product.product_name,shop_product.product_price,

shop_product.product_discount,shop_cart.cart_quantity,shop_product.product_first from shop_cart,shop_product where shop_cart.cart_shop_id=" + shop_id + " and shop_cart.cart_guest_id='" + guest_name + "' and shop_cart.cart_product_id=shop_product.product_id";
rs = bka.executeQuery(sql);
int total;
int total_first;
total=0;
total_first=0;
String product_name;
int product_price;
int product_discount;
int product_first;
int cart_quantity;

if (rs.next()){
while (rs.next()) {
product_id=java.lang.Integer.parseInt(rs.getString(1));
product_name=rs.getString(2);
product_price=java.lang.Integer.parseInt(rs.getString(3));
product_discount=java.lang.Integer.parseInt(rs.getString(4));
cart_quantity=java.lang.Integer.parseInt(rs.getString(5));
product_first=java.lang.Integer.parseInt(rs.getString(6));
%>

tr>
td width="10%" height="1" align="left">%=product_name%>/td>
td width="10%" height="1" align="left">%=product_price%>/td>
td width="10%" height="1" align="left">%=product_discount%>/td>
td width="10%" height="1" align="left">input type="text" name="%= "t" + product_id %>" size="3" value="%=cart_quantity%>">/td>
td width="14%" height="1" align="left">%=product_discount*cart_quantity%>/td>
td width="12%" height="1" align="left">%=product_first + "%"%>/td>
td width="17%" height="1" align="left">%=product_first*product_discount*cart_quantity/100.0%>/td>
td width="17%" height="1">div align="center">center>p>a href="shop_cart.jsp?action=deleteproduct_id=%=product_id%>">delete/a>/td>
/tr>

%
total=total+product_discount*cart_quantity;
total_first=total_first+product_discount*cart_quantity*product_first/100;
}
%>

tr align="center">
td width="72%" colspan="6" height="16">div align="right">p>总计/td>
td width="36%" colspan="2" height="16">div align="left">%=total%>/td>
/tr>
tr align="center">
td width="72%" colspan="6" height="16">div align="right">p>定金总计/td>
td width="36%" colspan="2" height="16">div align="left">%=total_first%>/td>
/tr>
tr align="center">
td width="72%" colspan="6" height="16">div align="right">p>结余/td>
td width="36%" colspan="2" height="16">div align="left">%=total-total_first%>/td>
/tr>
/table>
/center>/div>

%
}else{
%>
p align="center">购物车为空!/p>
%
}
%>


数据库操作部分

程序用到两个表：
1 shop_cart表
cart_id int 购物车编号 自动编号
cart_shop_id nvarchar 商店编号
cart_product_id nvarchar 商品编号
cart_quantity int 商品数量
临时存放购物车数据

2 shop_product表
product_id int 商品编号 自动编号
shop_id nvarchar 商店编号
product_name nvarchar 商品名称
product_bb nvarchar 商品介绍
product_price int 市场价
product_discount int 优惠价
product_img img 图片
product_status nvarchar 状态
product_first int 定金比例
product_type nvanchar 商品类型
存放商品资料

使用bka.java制成的javabean：bka.class可以提供对数据库的操作。

另外，需在控制面板的系统DSN中注册bka.dsn，
从而可使JSP通过JDBC-ODBC来调用sql数据库。
在页面中调用javabean，基本上可采用以下方式：


%@ page language="java" import="java.sql.*" %>
jsp:useBean id="RegisterBean" scope="page" class="shop.bka" />
%
String sql="select * from xxx";
ResultSet rs = RegisterBean.executeQuery(sql);
if(rs.next()) {
rs.close();
RegisterBean.closeStmt();
session.putValue("register_message","duplicate name found!");
}
%>
注意应在使用后将rs关闭。


以下是bka.java的源程序。注意在使用前需用javac加以编译成为class文件即javabean.

--shop/bka.java--


package shop;
import java.sql.*;

public class bka {
String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";
String sConnStr = "jdbc:odbc:bka";
Connection conn = null;
ResultSet rs = null;

public bka() {
try {
Class.forName(sDBDriver);
}
catch(java.lang.ClassNotFoundException e) {
System.err.println("bka(): " + e.getMessage());
}
}

public ResultSet executeQuery(String sql) {
rs = null;
try {
conn = DriverManager.getConnection(sConnStr,"xxx","yyy");
Statement stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
}
catch(SQLException ex) {
System.err.println("aq.executeQuery: " + ex.getMessage());
}
return rs;
}
}