电商购物车java代码电商购物车java代码是多少

编程 java 关于购物车

点击数量进入购物车页面，这个应该好做吧，跳动一个Action转发到购物车页面

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下面是我的图书购物车(自己写的)

package com.jc.ts.services;

import java.math.BigDecimal;

import java.util.Collection;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import com.jc.ts.entity.BookCar;

import com.jc.ts.entity.BookInfo;

/**

* 该类提供购物车的操作

* */

public class CartItemsService {

private MapString,BookCar itemMap=null;//购物车Map集合

private CollectionBookCar items;//购物车项

public CartItemsService()

{

itemMap=new HashMapString ,BookCar();

}

public CollectionBookCar getItems() {

return items;

}

public void setItems(CollectionBookCar items) {

this.items = items;

}

public MapString, BookCar getItemMap() {

return itemMap;

}

public void setItemMap(MapString, BookCar itemMap) {

this.itemMap = itemMap;

}

public int getBookCarSize()

{

return itemMap.size();

}

public boolean containById(String bookid)

{

return itemMap.containsKey(bookid);

}

public void addBookCarItems(BookInfo bookInfo)

{

if(bookInfo!=null)

{

BookCar bookCar=(BookCar)itemMap.get(bookInfo.getBid());

if(bookCar==null)

{

bookCar=new BookCar();

bookCar.setBookinfo(bookInfo);

bookCar.increaseQuantity();

itemMap.put(bookInfo.getBid(),bookCar);

items=itemMap.values();

}else {

bookCar.increaseQuantity();

}

public BookInfo removeCarItem(String bookid)

{

BookCar bookCar=itemMap.remove(bookid);

if(bookCar==null)

{

return null;

}

items=itemMap.values();

return bookCar.getBookinfo();

}

public BigDecimal getBookCarTotal()//获得总金额

{

BigDecimal carTotal=new BigDecimal("0.00");

IteratorBookCar iterator=this.getAllCartItems();

while(iterator.hasNext())

{

BookCar bookCar=iterator.next();

BigDecimal carPrice=bookCar.getBookinfo().getBprice();

BigDecimal quantity=new BigDecimal(String.valueOf(bookCar.getQuantity()));

carTotal=carTotal.add(carPrice.multiply(quantity));

}

return carTotal;

}

public IteratorBookCar getAllCartItems(){

return itemMap.values().iterator();

}

public void increaseQuantityById(String bookid)

{

BookCar bookCar=itemMap.get(bookid);

if(bookCar!=null)

{

bookCar.increaseQuantity();

}

public void setQuantityById(String bookid,int quantity)//根据图书ID增加数量

{

BookCar bookCar=itemMap.get(bookid);

if(bookCar!=null)

{

bookCar.setQuantity(quantity);

}

public void clear(){

itemMap.clear();

}

修改后传入这个方法就可以了setQuantityById()

★★★ 注意购物车一定要用Map 不能用List或ArrayList

因为购物车是顾客频繁操作的功能

Map在取值或删除值的效率比List或ArrayList要高的多

它基本不需要时间,而List或ArrayList还要遍历。。。。。。

希望对你有帮助!!

java中写商品购物车怎么实现每种商品总价都随商品数量变化而变化？？

以前学习java又做个实例，挺值得学习的。1.首先我先列出我们所需要的java类结构。1）Database.java---------模拟存储商品的数据库。2）McBean.java------------商品实体类，一个普通的javabean，里面有商品的基本属性。3）OrderItemBean.java---订单表。4）ShoppingCar.java------这个就是最主要的购物车，当然比较简单。5）TestShoppingCar.java---这个是测试类。2.下面贴出具体代码并带关键注释。---Database.javapublicclassDatabase{/*采用Map存储商品数据，为什么呢？我觉得这个问题你自己需要想下。*Integer为Map的key值，McBean为Map的value值。*/privatestaticMapdata=newHashMap();publicDatabase(){McBeanbean=newMcBean();bean.setId(1);bean.setName("地瓜");bean.setPrice(2.0);bean.setInstuction("新鲜的地瓜");data.put(1,bean);//把商品放入Mapbean=newMcBean();bean.setId(2);bean.setName("土豆");bean.setPrice(1.2);bean.setInstuction("又好又大的土豆");data.put(2,bean);//把商品放入Mapbean=newMcBean();bean.setId(3);bean.setName("丝瓜");bean.setPrice(1.5);bean.setInstuction("本地丝瓜");data.put(3,bean);//把商品放入Map}publicvoidsetMcBean(McBeanmcBean){data.put(mcBean.getId(),mcBean);}publicMcBeangetMcBean(intnid){returndata.get(nid);}}---McBean.javapublicclassMcBean{privateintid;//商品编号privateStringname;//商品名privatedoubleprice;//商品价格privateStringinstuction;//商品说明publicintgetId(){returnid;}publicvoidsetId(intid){this.id=id;}publicStringgetName(){returnname;}publicvoidsetName(Stringname){this.name=name;}publicdoublegetPrice(){returnprice;}publicvoidsetPrice(doubleprice){this.price=price;}publicStringgetInstuction(){returninstuction;}publicvoidsetInstuction(Stringinstuction){this.instuction=instuction;}}---ShoppingCar.javapublicclassShoppingCar{privatedoubletotalPrice;//购物车所有商品总价格privateinttotalCount;//购物车所有商品数量privateMapitemMap;//商品编号与订单项的键值对publicShoppingCar(){itemMap=newHashMap();}publicvoidbuy(intnid){OrderItemBeanorder=itemMap.get(nid);McBeanmb;if(order==null){mb=newDatabase().getMcBean(nid);order=newOrderItemBean(mb,1);itemMap.put(nid,order);update(nid,1);}else{order.setCount(order.getCount()+1);update(nid,1);}}publicvoiddelete(intnid){OrderItemBeandelorder=itemMap.remove(nid);totalCount=totalCount-delorder.getCount();totalPrice=totalPrice-delorder.getThing().getPrice()*delorder.getCount();}publicvoidupdate(intnid,intcount){OrderItemBeanupdorder=itemMap.get(nid);totalCount=totalCount+count;totalPrice=totalPrice+updorder.getThing().getPrice()*count;}publicvoidclear(){itemMap.clear();totalCount=0;totalPrice=0.0;}publicvoidshow(){DecimalFormatdf=newDecimalFormat("¤#.##");System.out.println("商品编号\t商品名称\t单价\t购买数量\t总价");Setset=itemMap.keySet();Iteratorit=set.iterator();while(it.hasNext()){OrderItemBeanorder=itemMap.get(it.next());System.out.println(order.getThing().getId()+"\t"+order.getThing().getName()+"\t"+df.format(order.getThing().getPrice())+"\t"+order.getCount()+"\t"+df.format(order.getCount()*order.getThing().getPrice()));}System.out.println("合计:总数量:"+df.format(totalCount)+"总价格:"+df.format(totalPrice));System.out.println("**********************************************");}}---OrderItemBean.javapublicclassOrderItemBean{privateMcBeanthing;//商品的实体privateintcount;//商品的数量publicOrderItemBean(McBeanthing,intcount){super();this.thing=thing;this.count=count;}publicMcBeangetThing(){returnthing;}publicvoidsetThing(McBeanthing){this.thing=thing;}publicintgetCount(){returncount;}publicvoidsetCount(intcount){this.count=count;}}---TestShoppingCar.javapackagecom.shop;publicclassTestShoppingCar{publicstaticvoidmain(String[]args){ShoppingCars=newShoppingCar();s.buy(1);//购买商品编号1的商品s.buy(1);s.buy(2);s.buy(3);s.buy(1);s.show();//显示购物车的信息s.delete(1);//删除商品编号为1的商品s.show();s.clear();s.show();}}3.打印输出结果商品编号商品名称单价购买数量总价1地瓜￥23￥62土豆￥1.21￥1.23丝瓜￥1.51￥1.5合计:总数量:￥5总价格:￥8.7**********************************************商品编号商品名称单价购买数量总价2土豆￥1.21￥1.23丝瓜￥1.51￥1.5合计:总数量:￥2总价格:￥2.7**********************************************商品编号商品名称单价购买数量总价合计:总数量:￥0总价格:￥0**********************************************4.打字太累了，比较匆忙，但是主要靠你自己领会。哪里不清楚再提出来。

java简单的购物车代码

package Test;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Scanner;

public class Test {

public static void main(String[] args) {

init();//初始化

MapString,String map = new LinkedHashMap();

while(true){

Scanner in= new Scanner(System.in);

map = buy(in,map);//选择

System.out.println();

System.out.println("还要继续购物吗?(Y/N)");

String jx = in.nextLine();

if(jx.equals("N")){

break;

}

print(map);

}

public static void print(MapString, String m){

System.out.println("\n\n\n******************");

System.out.println(" 购物车清单");

Integer hj = 0;

for (EntryString, String entry : m.entrySet()) {

String key = entry.getKey();

String value = entry.getValue();

if(key.equals("1")){

hj += Integer.parseInt(value)*3;

System.out.println("哇哈哈纯净水: "+value+"件，合计：￥"+Integer.parseInt(value)*3);

}else if(key.equals("2")){

hj += Integer.parseInt(value)*5;

System.out.println("康师傅方便面: "+value+"件，合计：￥"+Integer.parseInt(value)*5);

}else if(key.equals("3")){

hj += Integer.parseInt(value)*4;

System.out.println("可口可乐: "+value+"件，合计：￥"+Integer.parseInt(value)*4);

}

System.out.println("合计金额:￥"+hj);

}

public static void init(){

System.out.println("******************");

System.out.println("\t商品列表\n");

System.out.println(" 商品名称价格");

System.out.println("1. 哇哈哈纯净水￥3");

System.out.println("2. 康师傅方便面￥5");

System.out.println("3. 可口可乐￥4");

System.out.println("******************");

}

public static MapString,String buy(Scanner scan,MapString,String m){

System.out.print("请输入编号:");

String bh = scan.nextLine();

System.out.print("请输入购买数量:");

String num = scan.nextLine();

if(m.size()0 m.keySet().contains(bh)){

m.put(bh,(Integer.parseInt(bh)+Integer.parseInt(num))+"");

}else{

m.put(bh, num);

}

return m;

}

JAVA 购物车示例代码

import java.awt.*;

import java.awt.event.*;

class ShopFrame extends Frame implements ActionListener

{ Label label1,label2,label3,label4;

Button button1,button2,button3,button4,button5;

TextArea text;

Panel panel1,panel2;

static float sum=0.0f;

ShopFrame(String s)

{ super(s);

setLayout(new BorderLayout());

label1=new Label("面纸：3元",Label.LEFT);

label2=new Label("钢笔：5元",Label.LEFT);

label3=new Label("书：10元",Label.LEFT);

label4=new Label("袜子：8元",Label.LEFT);

button1=new Button("加入购物车");

button2=new Button("加入购物车");

button3=new Button("加入购物车");

button4=new Button("加入购物车");

button5=new Button("查看购物车");

text=new TextArea("商品有："+"\n",5,10);

text.setEditable(false);

addWindowListener(new WindowAdapter()

{ public void windowClosing(WindowEvent e)

{ System.exit(0);

}

);

button1.addActionListener(this);

button2.addActionListener(this);

button3.addActionListener(this);

button4.addActionListener(this);

button5.addActionListener(this);

panel1=new Panel();

panel2=new Panel();

panel1.add(label1);

panel1.add(button1);

panel1.add(label2);

panel1.add(button2);

panel1.add(label3);

panel1.add(button3);

panel1.add(label4);

panel1.add(button4);

panel2.setLayout(new BorderLayout());

panel2.add(button5,BorderLayout.NORTH);

panel2.add(text,BorderLayout.SOUTH);

this.add(panel1,BorderLayout.CENTER);

this.add(panel2,BorderLayout.SOUTH);

setBounds(100,100,350,250);

setVisible(true);

validate();

}

public void actionPerformed(ActionEvent e)

{ if(e.getSource()==button1)

{ text.append("一个面纸、");

sum=sum+3;

}

else if(e.getSource()==button2)

{ text.append("一只钢笔、");

sum=sum+5;

}

else if(e.getSource()==button3)

{ text.append("一本书、");

sum=sum+10;

}

else if(e.getSource()==button4)

{ text.append("一双袜子、");

sum=sum+8;

}

else if(e.getSource()==button5)

{

text.append("\n"+"总价为："+"\n"+sum);

}

public class Shopping {

public static void main(String[] args) {

new ShopFrame("购物车");

}

我没用Swing可能显示不出来你的效果。不满意得话我在给你编一个。

如何用java和jsp做一个简单的购物车

页面jsp ：

%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%

%@ taglib prefix="c" uri="

%@ taglib uri="

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "

html xmlns="

head

meta http-equiv="Content-Type" content="text/html; charset=utf-8" /

title易买网 - 首页/title

link type="text/css" rel="stylesheet" href="${pageContext.request.contextPath }/css/style.css" /

script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-2.1.1.js"/script

script type="text/javascript"

var contextPath = '${pageContext.request.contextPath }';

/script

script type="text/javascript" src="${pageContext.request.contextPath }/js/shopping.js"/script

/head

body

jsp:include page="top.jsp" /

div id="position" class="wrap"

您现在的位置：a href="Home"易买网/a gt; 购物车

/div

div class="wrap"

div id="shopping"

form action="" method="post"

table

th商品名称/th

th商品价格/th

th购买数量/th

th操作/th

/tr

c:forEach items="${sessionScope.shopCar}" var="item" varStatus="status"

tr id="product_id_${item.proId}"

td class="thumb"img src="${item.proImg }" height="50" width="30" /a href="Product?action=viewentityId=${item.proId}"${item.proName}/a/td

td class="price" id="price_id_1"

spanfmt:formatNumber value="${item.proPrice}" type="NUMBER" minFractionDigits="2" //span

input type="hidden" value="${item.proPrice}" /

/td

td class="number"

dtspan onclick="sub('number_id_${item.proId}','${item.proId}')"－/spaninput id="number_id_${item.proId}" type="text" readonly="readonly" name="number" value="${item.proNum}" /span onclick="addNum('number_id_${item.proId}','${item.proId}')"＋/span/dt

/dl

/td

td class="delete"a href="javascript:deleteItem('product_id_${item.proId}','${item.proId}')"删除/a/td

/tr

/c:forEach

/table

div class="button"input type="submit" value="" //div

/form

/div

div id="footer"

/div

/body

/html

页面关联的js 自己去网上下载一个jquery

/*数量减少*/

function sub(id,proId){

//购买数量的值

var num = $('#'+id).val();

if(num 1){

$('#'+id).val(num - 1);

}

edit(id,proId);

}

function edit(id,proId){

var url = contextPath + '/HomeCarManager';

//修改后的数量，购物明细的商品的id

num = $('#'+id).val();

$.post(url,{"num":num,"proId":proId},function (msg){

if(msg == 'true'){

alert('修改成功');

} else {

alert('修改失败');

}*/

});

}

/**

* 数量增加

* @param {} id

function addNum(id,proId){

//购买数量的值

var num = $('#'+id).val();

$('#'+id).val(parseInt(num) + 1);

edit(id,proId);

}

/**

* 删除购物明细

function deleteItem(trId,proId){

//console.log($("#"+trId));

//js删除页面节点

//$("#"+trId).remove();

var url = contextPath + '/HomeCarManager';

$.post(url,{"proId":proId},function (msg){

if(msg == 'true'){

//js删除页面节点

$("#"+trId).remove();

}

});

}

后台servlet1

package com.kaka.web;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* 购物车处理类

* @author @author ITJob 远标培训

import com.kaka.entity.Items;

import com.kaka.entity.Product;

import com.kaka.service.ProductService;

import com.kaka.service.impl.ProductServiceImpl;

public class HomeCar extends HttpServlet {

private static final long serialVersionUID = 1L;

ProductService ps = new ProductServiceImpl();

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

//获取商品的id

String proId = req.getParameter("proId");

resp.setContentType("text/html;charset=UTF-8");

PrintWriter writer = resp.getWriter();

if(null != proId !"".equals(proId)){

//返回添加购物车成功

//System.out.println("=============" + proId);

//根据商品的id查询商品

try {

Integer pId = Integer.parseInt(proId);

Product product = ps.findProductById(pId);

if(null != product){

//查询到了商品，将商品的相关参数构建一个购物明细放入到购物车

Items it = new Items();

it.setProId(product.getProId());

it.setProName(product.getProName());

it.setProPrice(product.getProPrice());

it.setProImg(product.getProImg());

//先判断session范围是否有购物车

ListItems shopCar = (ListItems)req.getSession().getAttribute("shopCar");

if(null == shopCar){

//购物车

shopCar = new ArrayListItems();

}

//将商品加入到购物车之前，判断购物车中是否已经包含了该购物明细，如果包含了，只需要修改购买的数量

if(shopCar.contains(it)){

int index = shopCar.indexOf(it);//寻找购物车中包含购物明细在购物车中位置

Items items = shopCar.get(index);//获取购物车中存在的购物明细

items.setProNum(items.getProNum()+1);

} else {

shopCar.add(it);

}

//将购物车放入到session访问

req.getSession().setAttribute("shopCar", shopCar);

//返回

writer.print(true);

} else {

writer.print(false);

}

} catch (Exception e) {

e.printStackTrace();

writer.print(false);

}

} else {

writer.print(false);

}

writer.flush();

writer.close();

}

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

doPost(req, resp);

}

后台管理servlet

package com.kaka.web;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.List;

import javax.mail.FetchProfile.Item;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* 购物车修改

* @author ITJob 远标培训

import com.kaka.entity.Items;

import com.kaka.entity.Product;

import com.kaka.service.ProductService;

import com.kaka.service.impl.ProductServiceImpl;

public class HomeCarManager extends HttpServlet {

private static final long serialVersionUID = 1L;

ProductService ps = new ProductServiceImpl();

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

resp.setContentType("text/html;charset=UTF-8");

PrintWriter writer = resp.getWriter();

//获取参数

String proId = req.getParameter("proId");

String num = req.getParameter("num");

if(null != proId null != num

!"".equals(proId) !"".equals(num)){

try {

Integer pId = Integer.parseInt(proId);

Float pNum = Float.parseFloat(num);

//根据商品的id获取对应的明细项

// 先判断session范围是否有购物车

ListItems shopCar = (ListItems) req.getSession().getAttribute("shopCar");

for(Items it : shopCar){

if(it.getProId()== pId){

it.setProNum(pNum);

}

writer.print(true);

} catch (Exception e) {

e.printStackTrace();

}

} else {

//删除的操作

try {

Integer pId = Integer.parseInt(proId);

//根据商品的id获取对应的明细项

// 先判断session范围是否有购物车

ListItems shopCar = (ListItems) req.getSession().getAttribute("shopCar");

Items items = null;

for(Items it : shopCar){

if(it.getProId()== pId){

items = it;

break;

}

if(null != items){

shopCar.remove(items);

req.getSession().setAttribute("shopCar",shopCar);

}

writer.print(true);

} catch (Exception e) {

e.printStackTrace();

}

writer.flush();

writer.close();

}

@Override

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

doPost(req, resp);

}

JAVA语言编写的网上订餐系统购物车功能如何实现？

用Vector 或者是HashMap去装

下面有部分代码你去看吧

package com.aptech.restrant.DAO;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Set;

import java.sql.Connection;

import com.aptech.restrant.bean.CartItemBean;

import com.aptech.restrant.bean.FoodBean;

public class CartModel {

private Connection conn;

public CartModel(Connection conn) {

this.conn=conn;

}

/**

* 得到订餐列表

* @return

public List changeToList(Map carts) {

// 将Set中元素转换成数组，以便使用循环进行遍历

Object[] foodItems = carts.keySet().toArray();

// 定义double变量total，用于存放购物车内餐品总价格

double total = 0;

List list = new ArrayList();

// 循环遍历购物车内餐品，并显示各个餐品的餐品名称，价格，数量

for (int i = 0; i foodItems.length; i++) {

// 从Map对象cart中取出第i个餐品，放入cartItem中

CartItemBean cartItem = (CartItemBean) carts

.get((String) foodItems[i]);

// 从cartItem中取出FoodBean对象

FoodBean food1 = cartItem.getFoodBean();

// 定义int类型变量quantity，用于表示购物车中单个餐品的数量

int quantity = cartItem.getQuantity();

// 定义double变量price，表示餐品单价

double price = food1.getFoodPrice();

// 定义double变量，subtotal表示单个餐品总价

double subtotal = quantity * price;

// // 计算购物车内餐品总价格

total += subtotal;

cartItem.setSubtotal(subtotal);

cartItem.setTotal(total);

list.add(cartItem);

}

return list;

}

/**

* 增加订餐

public Map add(Map cart, String foodID) {

// 购物车为空

if (cart == null) {

cart = new HashMap();

}

FoodModel fd = new FoodModel(conn);

FoodBean food = fd.findFoodById(foodID);

// 判断购物车是否放东西(第一次点餐)

if (cart.isEmpty()) {

CartItemBean cartBean = new CartItemBean(food, 1);

cart.put(foodID, cartBean);

} else {

// 判断当前菜是否在购物车中，false表示当前菜没有被点过。。

boolean flag = false;

// 得到键的集合

Set set = cart.keySet();

// 遍历集合

Object[] obj = set.toArray();

for (int i = 0; i obj.length; i++) {

Object object = obj[i];

// 如果购物车已经存在当前菜，数量+1

if (object.equals(foodID)) {

int quantity = ((CartItemBean) cart.get(object))

.getQuantity();

quantity += 1;

System.out.println(quantity);

((CartItemBean) cart.get(object)).setQuantity(quantity);

flag = true;

break;

}

if (flag == false) {

// 把当前菜放到购物车里面

CartItemBean cartBean = new CartItemBean(food, 1);

cart.put(foodID, cartBean);

}

return cart;

}

/**

* 取消订餐

public Map remove(Map cart, String foodID) {

cart.remove(foodID);

return cart;

}

/**

* 更新购物车信息

* @param cart

* @param foodID

* @return

public MapString, CartItemBean update(Map cart, String foodID,

boolean isAddorRemove) {

Map map;

if (isAddorRemove) {

map = add(cart, foodID);

} else {

map = remove(cart, foodID);

}

return map;

}

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