购物车的源程序

答案：

                        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%>&curpage=<%=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=><%=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><tableborder="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">
<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%>">清空购物车</a></td>
</tr>
</table>
</center></div></td>
<td width="122" height="7" style="border: medium" align="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>
</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 %>

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