JSP实现购物车功能

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 + "'";
＜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=Байду номын сангаас8" align="left"＞数量＜/td＞
＜td width="14%" height="8" align="left"＞小计＜/td＞
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=
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"));
＜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){
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 ;
＜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＞
＜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＞
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="
下面是我用JSP和数据库做的购物车的源程序：
//shop_cart.jsp
＜%@ page contentType="text/html;charset=gb2312"%＞
＜%@ page session="true" %＞
＜%@ page language="java" import="java.sql.*" %＞
＜%
sql="select shop_product.product_id,shop_product.product_name,
shop_product.product_price,shop_product.product_discount,
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"
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 ;
border="1" cellpadding="2" cellspacing="0"
width="100%" bordercolorlight="#FFB468"
bordercolordark="#FFFFFF" bgcolor="#FFB468"＞
＜tr＞
＜td width="100%"＞＜div align="center"＞＜center＞＜p＞
＜%=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
＜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＞
action="shop_cart.jsp?action=update&product_type=＜%=product_type%＞&curp
age=＜%=curpage%＞"＞
＜table border="0" cellpadding="0" cellspacing="0" width="610"
align="center"＞＜div align="center"＞＜center＞＜table
border="1" cellpadding="2" cellspacing="0" width="100%"
bordercolorlight="#FFB468"
bordercolordark="#FFFFFF" bgcolor="#FFB468"＞
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)";
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%"
+ 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;
}
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");
＜/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%"
rs = bka.executeQuery(sql);
}
%＞
＜div align="center"＞＜center＞
＜table border="0" cellpadding="0" cellspacing="0" width="610"
height="2"＞
＜tr＞
＜td＞＜form method="POST"
＜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＞