jsp購物車源碼①

離開╭ァ會沉淪 2011-01-03

展開全文

//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(shù)和商品類型參數(shù)，可以在“繼續(xù)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＞
＜/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%＞"＞繼續(xù)購物＜/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()"＞重新計費＜/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%＞"＞清空購物車＜/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"＞確認購買＜/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"＞商品名稱＜/td＞
＜td width="10%" height="8" align="left"＞市場價＜/td＞
＜td width="10%" height="8" align="left"＞優(yōu)惠價＜/td＞
＜td width="10%" height="8" align="left"＞數(shù)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(jié)余＜/td＞
＜td width="36%" colspan="2" height="16"＞＜div align="left"＞
＜%=total-total_first%＞＜/td＞
＜/tr＞
＜/table＞
＜/center＞＜/div＞

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

數(shù)據(jù)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_id nvarchar 商店編號
cart_product_id nvarchar 商品編號
cart_quantity int 商品數(shù)量
臨時存放購物車數(shù)據(jù)

2 shop_product表
product_id int 商品編號自動編號
shop_id nvarchar 商店編號
product_name nvarchar 商品名稱
product_bb nvarchar 商品介紹
product_price int 市場價
product_discount int 優(yōu)惠價
product_img img 圖片
product_status nvarchar 狀態(tài)
product_first int 定金比例
product_type nvanchar 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(shù)據(jù)庫的操作。

另外，需在控制面板的系統(tǒng)DSN中注冊bka.dsn，
從而可使JSP通過JDBC-ODBC來調(diào)用sql數(shù)據(jù)庫。
在頁面中調(diào)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;
}
}