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JSP >> 用JSP和数据库做的购物车的源程序
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用JSP和数据库做的购物车的源程序
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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.*" %＞
＜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="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=clear&product_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=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＞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;
}
}
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