下面是我用JSP和數據庫做的購物車的源程序：

注意：
1、重新計費部分還沒有做好，大家自己動手吧！
2、下一版本將用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;

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

//頁數和商品類型參數，可以在“繼續購物”時返回到上次購物的頁面
if (request.getParameter("curpage")==null){
curpage=1;
}else{
curpage=java.lang.Integer.parseInt(request.getParameter("curpage"));
}

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

//商品編號
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);

//商店編號
session.putValue("shop_id",num);
//顧客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>購物車</td>
</tr>

</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%>">繼續購物</a></td>
</tr>

</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()">重新計費</a></td>
</tr>

</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=clear&product_type=<%=product_type%>&curpage=<%=curpage%>">清空購物車</a></td>
</tr>

</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">確認購買</a></td>
</tr>

</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">商品名稱</td>
<td width="10%" height="8" align="left">市場價</td>
<td width="10%" height="8" align="left">優惠價</td>
<td width="10%" height="8" align="left">數量</td>
<td width="14%" height="8" align="left">小計</td>
<td width="12%" height="8" align="left">定金比例</td>
<td width="17%" height="8" align="left">定金小計</td>
<td width="17%" height="8" align="left">刪除</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=delete&product_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>總計</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>定金總計</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>結余</td>
<td width="36%" colspan="2" height="16"><div align="left"><%=total-total_first%></td>
</tr>

</center></div>

<%
}else{
%>
<p align="center">購物車為空!</p>
<%
}
%>



數據庫操作部分

程序用到兩個表：
1 shop_cart表
cart_id int購物車編號自動編號
cart_shop_idnvarchar 商店編號
cart_product_id nvarchar 商品編號
cart_quantityint 商品數量
臨時存放購物車數據

2 shop_product表
product_idint商品編號 自動編號
shop_id nvarchar商店編號
product_namenvarchar 商品名稱
product_bb nvarchar 商品介紹
product_priceint 市場價
product_discountint 優惠價
product_img img圖片
product_status nvarchar狀態
product_first int定金比例
product_typenvanchar 商品類型
存放商品資料

使用bka.java制成的javabean：bka.class可以提供對數據庫的操作。

另外，需在控制面板的系統DSN中注冊bka.dsn，
從而可使JSP通過JDBC-ODBC來調用sql數據庫。
在頁面中調用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!");
}
%>
注意應在使用后將rs關閉。


以下是bka.java的源程序。注意在使用前需用javac加以編譯成為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;
}
}