專案概述
前面的時候我寫過一個商品瀏記錄的小例子，這一次我們使用實現購物車效果。前面的例子是：
http://blog.csdn.net/erlian1992/article/details/52047258。這一次在此基礎上來採用的是MVC三層模型實現
(JSP Servlet dao)來實現這個小專案。
三層架構：
JSP檢視層
Servlet控制層
dao模型層
DB資料庫層
編碼實現：
首先先來資料庫指令碼items.sql：
/*
Navicat MySQL Data Transfer
Source Server : MySQL50
Source Server Version : 50067
Source Host : localhost:3306
Source Database : shopping
Target Server Type : MYSQL
Target Server Version : 50067
File Encoding : 65001
Date: 2016-08-01 12:12:31
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for items
-- ----------------------------
DROP TABLE IF EXISTS `items`;
CREATE TABLE `items` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(50) default NULL,
`city` varchar(50) default NULL,
`price` int(11) default NULL,
`number` int(11) default NULL,
`picture` varchar(500) default NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of items
-- ----------------------------
INSERT INTO `items` VALUES ('1', '沃特籃球鞋', '佛山', '180', '500', '001.jpg');
INSERT INTO `items` VALUES ('2', '安踏運動鞋', '福州', '120', '800', '002.jpg');
INSERT INTO `items` VALUES ('3', '耐克運動鞋', '廣州', '500', '1000', '003.jpg');
INSERT INTO `items` VALUES ('4', '阿迪達斯T血衫', '上海', '388', '600', '004.jpg');
INSERT INTO `items` VALUES ('5', '李寧文化衫', '廣州', '180', '900', '005.jpg');
INSERT INTO `items` VALUES ('6', '小米3', '北京', '1999', '3000', '006.jpg');
INSERT INTO `items` VALUES ('7', '小米2S', '北京', '1299', '1000', '007.jpg');
INSERT INTO `items` VALUES ('8', 'thinkpad筆記本', '北京', '6999', '500', '008.jpg');
INSERT INTO `items` VALUES ('9', 'dell筆記本', '北京', '3999', '500', '009.jpg');
INSERT INTO `items` VALUES ('10', 'ipad5', '北京', '5999', '500', '010.jpg');我們再來連線MySQL資料庫工具類DBHelper：
package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
/**
* 連線MySQL資料庫工具類
* @author Administrator
* @date 2016年08月01日
*/
public class DBHelper {
//資料庫驅動
private static final String driver = "com.mysql.jdbc.Driver";
//連線資料庫的URL地址
private static final String url="jdbc:mysql://localhost:3306/shopping?useUnicode=true&characterEncoding=UTF-8";
//資料庫的使用者名稱
private static final String username="root";
//資料庫的密碼
private static final String password="root";
//Connection連線物件conn
private static Connection conn=null;
//靜態程式碼塊負責載入驅動
static {
try{
Class.forName(driver);
}catch(Exception e){
e.printStackTrace();
}
}
//單例模式返回資料庫連線物件
public static Connection getConnection() throws Exception{
if(conn==null){
conn = DriverManager.getConnection(url, username, password);
return conn;
}else{
return conn;
}
}
public static void main(String[] args) {
//測試資料庫是否連線正常
try{
Connection conn = DBHelper.getConnection();
if(conn!=null){
System.out.println("資料庫連線正常！");
}else{
System.out.println("資料庫連線異常！");
}
}catch(Exception e){
e.printStackTrace();
}
}
}
再來建立兩個實體類，一個是對應items資料表的Items.java
package com.entity;
/**
* 商品實體類
* @author Administrator
* @date 2016年08月01日
*/
public class Items {
private int id; // 商品編號
private String name; // 商品名稱
private String city; // 產地
private int price; // 價格
private int number; // 庫存
private String picture; // 商品圖片
//保留此不帶引數的構造方法
public Items(){
}
//不帶引數的構造方法
public Items(int id,String name,String city,int price,int number,String picture){
this.id = id;
this.name = name;
this.city = city;
this.picture = picture;
this.price = price;
this.number = number;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public String getPicture() {
return picture;
}
public void setPicture(String picture) {
this.picture = picture;
}
@Override
public int hashCode() {
return this.getId() this.getName().hashCode();
}
@Override
public boolean equals(Object obj) {
if(this==obj){
return true;
}
if(obj instanceof Items){
Items i = (Items)obj;
if(this.getId()==i.getId()&&this.getName().equals(i.getName())){
return true;
}else{
return false;
}
}else{
return false;
}
}
@Override
public String toString(){
return "商品編號：" this.getId() "，商品名稱：" this.getName();
}
}一個是Cart.java
package com.entity;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* 購物車實體類(新增、刪除和計算價格)
* @author Administrator
* @date 2016年08月01日
*/
public class Cart {
//購買商品的集合
private HashMap<Items,Integer> goods;
//購物車的總金額
private double totalPrice;
//構造方法
public Cart(){
goods = new HashMap<Items,Integer>();
totalPrice = 0.0;
}
public HashMap<Items, Integer> getGoods() {
return goods;
}
public void setGoods(HashMap<Items, Integer> goods) {
this.goods = goods;
}
public double getTotalPrice() {
return totalPrice;
}
public void setTotalPrice(double totalPrice) {
this.totalPrice = totalPrice;
}
//新增商品進購物車的方法
public boolean addGoodsInCart(Items item ,int number){
if(goods.containsKey(item)){
goods.put(item, goods.get(item) number);
}else{
goods.put(item, number);
}
calTotalPrice(); //重新計算購物車的總金額
return true;
}
//刪除商品的方法
public boolean removeGoodsFromCart(Items item){
goods.remove(item);
calTotalPrice(); //重新計算購物車的總金額
return true;
}
//統計購物車的總金額
public double calTotalPrice(){
double sum = 0.0;
Set<Items> keys = goods.keySet(); //獲得鍵的集合
Iterator<Items> it = keys.iterator(); //獲得迭代器物件
while(it.hasNext()){
Items i = it.next();
sum = i.getPrice()* goods.get(i);
}
this.setTotalPrice(sum); //設定購物車的總金額
return this.getTotalPrice();
}
public static void main(String[] args) {
//先建立兩個商品物件
Items i1 = new Items(1,"沃特籃球鞋","溫州",200,500,"001.jpg");
Items i2 = new Items(2,"李寧運動鞋","廣州",300,500,"002.jpg");
Items i3 = new Items(1,"沃特籃球鞋","溫州",200,500,"001.jpg");
Cart cart = new Cart();
cart.addGoodsInCart(i1, 1);
cart.addGoodsInCart(i2, 2);
//再次購買沃特籃球鞋，購買3雙
cart.addGoodsInCart(i3, 3);
//遍歷購物車商品的集合
Set<Map.Entry<Items, Integer>> items= cart.getGoods().entrySet();
for(Map.Entry<Items, Integer> obj:items){
System.out.println(obj);
}
System.out.println("購物車的總金額：" cart.getTotalPrice());
}
}接下來是dao層ItemsDAO.java
package com.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import com.util.DBHelper;
import com.entity.Items;
/**
* 商品的業務邏輯類
* @author Administrator
* @date 2016年08月01日
*/
public class ItemsDAO {
// 獲得所有的商品資訊
public ArrayList<Items> getAllItems() {
Connection conn = null;//資料庫連線物件
PreparedStatement stmt = null;//SQL語句物件
ResultSet rs = null;//資料集物件
ArrayList<Items> list = new ArrayList<Items>(); // 商品集合
try {
conn = DBHelper.getConnection();
String sql = "select * from items;"; // 查詢SQL語句
stmt = conn.prepareStatement(sql);
rs = stmt.executeQuery();//獲取資料集
while (rs.next()) {
Items item = new Items();
item.setId(rs.getInt("id"));
item.setName(rs.getString("name"));
item.setCity(rs.getString("city"));
item.setNumber(rs.getInt("number"));
item.setPrice(rs.getInt("price"));
item.setPicture(rs.getString("picture"));
list.add(item);// 把一個商品加入集合
}
return list; // 返回集合。
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
// 釋放資料集物件
if (rs != null) {
try {
rs.close();
rs = null;
} catch (Exception e) {
e.printStackTrace();
}
}
// 釋放SQL語句物件
if (stmt != null) {
try {
stmt.close();
stmt = null;
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
// 根據商品編號ID獲得商品詳細資料
public Items getItemsById(int id) {
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
conn = DBHelper.getConnection();
String sql = "select * from items where id=?;"; // SQL查詢語句
stmt = conn.prepareStatement(sql);
//把id的值賦給SQL查詢語句中第一個問號
stmt.setInt(1, id);
rs = stmt.executeQuery();
if (rs.next()) {
Items item = new Items();
item.setId(rs.getInt("id"));
item.setName(rs.getString("name"));
item.setCity(rs.getString("city"));
item.setNumber(rs.getInt("number"));
item.setPrice(rs.getInt("price"));
item.setPicture(rs.getString("picture"));
return item;
} else {
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
// 釋放資料集物件
if (rs != null) {
try {
rs.close();
rs = null;
} catch (Exception e) {
e.printStackTrace();
}
}
// 釋放語句物件
if (stmt != null) {
try {
stmt.close();
stmt = null;
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
//獲取最近瀏覽的前五條商品資訊
public ArrayList<Items> getViewList(String list){
System.out.println("list:" list);
ArrayList<Items> itemlist = new ArrayList<Items>();
int iCount=5; //每次返回前五條記錄
if(list!=null&&list.length()>0){
String[] arr = list.split(",");
System.out.println("arr.length=" arr.length);
//如果商品記錄大於等於5條
if(arr.length>=5){
for(int i=arr.length-1;i>=arr.length-iCount;i--){
itemlist.add(getItemsById(Integer.parseInt(arr[i])));
}
}else{
for(int i=arr.length-1;i>=0;i--){
itemlist.add(getItemsById(Integer.parseInt(arr[i])));
}
}
return itemlist;
}else{
return null;
}
}
}最後是Servlet控制層中的CartServlet：
package com.servlet;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.ItemsDAO;
import com.entity.Cart;
import com.entity.Items;
/**
* Servlet implementation class CarServlet
*/
@WebServlet(name="CartServlet" ,urlPatterns={"/CartServlet"})
public class CartServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private String action;//表示購物車動作：add,show,delete
private ItemsDAO idao = new ItemsDAO();//商品業務邏輯類物件
/**
* @see HttpServlet#HttpServlet()
*/
public CartServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
}
/**
* @see Servlet#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=UTF-8");
//PrintWriter out = response.getWriter();
if(request.getParameter("action")!=null){
this.action = request.getParameter("action");
//新增商品進購物車
if(action.equals("add")) {
if(addToCart(request,response)){
request.getRequestDispatcher("/success.jsp").forward(request, response);
}else{
request.getRequestDispatcher("/failure.jsp").forward(request, response);
}
}
//顯示購物車
if(action.equals("show")){
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
//如果是執行刪除購物車中的商品
if(action.equals("delete")) {
if(deleteFromCart(request,response)){
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}else{
request.getRequestDispatcher("/cart.jsp").forward(request, response);
}
}
}
}
//新增商品進購物車的方法
private boolean addToCart(HttpServletRequest request, HttpServletResponse response){
String id = request.getParameter("id");
String number = request.getParameter("num");
Items item = idao.getItemsById(Integer.parseInt(id));
//是否是第一次給購物車新增商品，需要給session中建立一個新的購物車物件
if(request.getSession().getAttribute("cart") == null){
Cart cart = new Cart();
request.getSession().setAttribute("cart",cart);
}
//不是第一次新增進購物車
Cart cart = (Cart)request.getSession().getAttribute("cart");
if(cart.addGoodsInCart(item, Integer.parseInt(number))){
return true;
}else{
return false;
}
}
//從購物車中刪除商品
private boolean deleteFromCart(HttpServletRequest request, HttpServletResponse response){
String id = request.getParameter("id");
Cart cart = (Cart)request.getSession().getAttribute("cart");
Items item = idao.getItemsById(Integer.parseInt(id));
if(cart.removeGoodsFromCart(item)){
return true;
}else{
return false;
}
}
}再來檢視層：
商品列表頁面index.jsp
<%@page import="com.entity.Items"%>
<%@page import="com.dao.ItemsDAO"%>
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>商品列表頁面</title>
<style type="text/css">
hr{
border-color:FF7F00;
}
div{
float:left;
margin: 10px;
}
div dd{
margin:0px;
font-size:10pt;
}
div dd.dd_name{
color:blue;
}
div dd.dd_city{
color:#000;
}
</style>
</head>
<body>
<h1>商品展示</h1>
<hr>
<center>
<table width="750" height="60" cellpadding="0" cellspacing="0" border="0">
<tr>
<td>
<!-- 商品迴圈開始 -->
<%
//防止中文亂碼
request.setCharacterEncoding("UTF-8");
ItemsDAO itemsDao = new ItemsDAO();
ArrayList<Items> list = itemsDao.getAllItems();
if(list!=null&&list.size()>0){
for(int i=0;i<list.size();i ){
Items item = list.get(i);
%>
<div>
<dl>
<dt>
<a href="details.jsp?id=<%=item.getId()%>">
<img src="images/<%=item.getPicture()%>" width="120" height="90" border="1"/>
</a>
</dt>
<dd class="dd_name"><%=item.getName() %></dd>
<dd class="dd_city">產地:<%=item.getCity() %> 價格:￥ <%=item.getPrice() %></dd>
</dl>
</div>
<!-- 商品迴圈結束 -->
<%
}
}
%>
</td>
</tr>
</table>
</center>
</body>
</html>商品詳情頁面details.jsp
<%@page import="java.util.ArrayList"%>
<%@ page import="com.entity.Items"%>
<%@ page import="com.dao.ItemsDAO"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>商品詳情頁面</title>
<link href="css/main.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="js/lhgcore.js"></script>
<script type="text/javascript" src="js/lhgdialog.js"></script>
<script type="text/javascript">
function selflog_show(id){
var num = document.getElementById("number").value;
J.dialog.get({id: 'haoyue_creat',title: '購物成功',width: 600,height:400, link: '<%=path%>/CartServlet?id=' id '&num=' num '&action=add', cover:true});
}
//商品數量增加
function add() {
var num = parseInt(document.getElementById("number").value);
if (num < 100) {
document.getElementById("number").value = num;
}
}
//商品數量減少
function sub() {
var num = parseInt(document.getElementById("number").value);
if (num > 1) {
document.getElementById("number").value = --num;
}
}
</script>
<style type="text/css">
hr {
border-color: FF7F00;
}
div {
float: left;
margin-left: 30px;
margin-right: 30px;
margin-top: 5px;
margin-bottom: 5px;
}
div dd {
margin: 0px;
font-size: 10pt;
}
div dd.dd_name {
color: blue;
}
div dd.dd_city {
color: #000;
}
div #cart {
margin: 0px auto;
text-align: right;
}
span {
padding: 0 2px;
border: 1px #c0c0c0 solid;
cursor: pointer;
}
a {
text-decoration: none;
}
</style>
</head>
<body>
<h1>商品詳情</h1>
<a href="index.jsp">首頁</a> >> <a href="index.jsp">商品列表</a>
<hr>
<center>
<table width="750" height="60" cellpadding="0" cellspacing="0" border="0">
<tr>
<!-- 商品詳情 -->
<%
ItemsDAO itemDao = new ItemsDAO();
Items item = itemDao.getItemsById(Integer.parseInt(request.getParameter("id")));
if(item != null){
%>
<td width="70%" valign="top">
<table>
<tr>
<td rowspan="4"><img src="images/<%=item.getPicture()%>" width="200" height="160"/></td>
</tr>
<tr>
<td><B><%=item.getName() %></B></td>
</tr>
<tr>
<td>產地：<%=item.getCity()%></td>
</tr>
<tr>
<td>價格：<%=item.getPrice() %>￥</td>
</tr>
<tr>
<td>購買數量：
<span id="sub" onclick="sub();">-</span><input type="text" id="number" name="number" value="1" size="2" /><span id="add" onclick="add();"> </span>
</td>
</tr>
</table>
<div id="cart">
<img src="images/buy_now.png" />
<a href="javascript:selflog_show(<%=item.getId()%>)"><img src="images/in_cart.png" /></a>
<a href="CartServlet?action=show"><img src="images/view_cart.jpg" /></a>
</div>
</td>
<%
}
%>
<%
String list ="";
//從客戶端獲得Cookies集合
Cookie[] cookies = request.getCookies();
//遍歷這個Cookies集合
if(cookies != null&&cookies.length > 0){
for(Cookie c:cookies){
if(c.getName().equals("ListViewCookie")){
list = c.getValue();
}
}
}
//追加商品編號
list = request.getParameter("id") ",";
//如果瀏覽記錄超過1000條，清零.
String[] arr = list.split(",");
if(arr != null&&arr.length > 0){
if(arr.length>=1000){
list = "";
}
}
Cookie cookie = new Cookie("ListViewCookie",list);
response.addCookie(cookie);
%>
<!-- 瀏覽過的商品 -->
<td width="30%" bgcolor="#EEE" align="center">
<br>
<b>您瀏覽過的商品</b><br>
<!-- 迴圈開始 -->
<%
ArrayList<Items> itemlist = itemDao.getViewList(list);
if(itemlist!=null&&itemlist.size()>0 ){
System.out.println("itemlist.size=" itemlist.size());
for(Items i:itemlist){
%>
<div>
<dl>
<dt>
<a href="details.jsp?id=<%=i.getId()%>"><img src="images/<%=i.getPicture() %>" width="120" height="90" border="1"/></a>
</dt>
<dd class="dd_name"><%=i.getName() %></dd>
<dd class="dd_city">產地:<%=i.getCity() %> 價格:<%=i.getPrice() %> ￥ </dd>
</dl>
</div>
<%
}
}
%>
<!-- 迴圈結束 -->
</td>
</tr>
</table>
</center>
</body>
</html>購買成功頁面success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>購買成功頁面</title>
</head>
<body>
<center>
<img src="images/add_cart_success.jpg"/>
<hr>
<%
String id = request.getParameter("id");
String num = request.getParameter("num");
%>
您成功購買了<%=num %>件商品編號為<%=id %>的商品
<br>
<br>
<br>
</center>
</body>
</html>購買失敗頁面failure.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>購買失敗頁面</title> </head> <body> <center> <img src="images/add_cart_failure.jpg"/> <hr> <br> <br> <br> </center> </body> </html>
購物車頁面cart.jsp
<%@page import="java.util.Iterator"%>
<%@page import="java.util.Set"%>
<%@page import="com.entity.Items"%>
<%@page import="java.util.HashMap"%>
<%@page import="com.entity.Cart"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>購物車頁面</title>
<link type="text/css" rel="stylesheet" href="css/style1.css" />
<script type="text/javascript">
function delcfm() {
if (!confirm("確認要刪除？")) {
window.event.returnValue = false;
}
}
</script>
</head>
<body>
<h1>我的購物車</h1>
<a href="index.jsp">首頁</a> >>
<a href="index.jsp">商品列表</a>
<hr>
<div id="shopping">
<form action="#" method="post">
<table>
<tr>
<th>商品名稱</th>
<th>商品單價</th>
<th>商品價格</th>
<th>購買數量</th>
<th>操作</th>
</tr>
<%
//首先判斷session中是否有購物車物件
if(request.getSession().getAttribute("cart")!=null){
%>
<!-- 迴圈的開始 -->
<%
Cart cart = (Cart)request.getSession().getAttribute("cart");
HashMap<Items,Integer> goods = cart.getGoods();
Set<Items> items = goods.keySet();
Iterator<Items> it = items.iterator();
while(it.hasNext()){
Items i = it.next();
%>
<tr name="products" id="product_id_1">
<td class="thumb">
<img src="images/<%=i.getPicture()%>" />
<a href=""><%=i.getName()%></a>
</td>
<td class="number"><%=i.getPrice() %></td>
<td class="price" id="price_id_1">
<span><%=i.getPrice()*goods.get(i) %></span>
<input type="hidden" value="" />
</td>
<td class="number"><%=goods.get(i)%></td>
<td class="delete"><a href="CartServlet?action=delete&id=<%=i.getId()%>" onclick="delcfm();">刪除</a></td>
</tr>
<%
}
%>
<!--迴圈的結束-->
</table>
<div class="total">
<span id="total">總計：<%=cart.getTotalPrice() %>￥</span>
</div>
<%
}
%>
<div class="button">
<input type="submit" value="" />
</div>
</form>
</div>
</body>
</html>專案執行結果：
商品列表：
選擇一個商品進入商品詳情：
選擇好數量，加入到購物車中：
檢視購物車：
針對很多人要原始碼，我把原始碼上傳了到CSDN上，大家自己下載，工作了有時候回覆不及時。本來想要直接分
享的，可是最低需要設定一個積分，沒辦法，以後程式碼會放在GITHUB上。
地址：https://download.csdn.net/download/erlian1992/10393969