編程 java 關(guān)于購物車

點擊數(shù)量進(jìn)入購物車頁面，這個應(yīng)該好做吧，跳動一個Action轉(zhuǎn)發(fā)到購物車頁面

創(chuàng)新互聯(lián)建站專業(yè)為企業(yè)提供疏附網(wǎng)站建設(shè)、疏附做網(wǎng)站、疏附網(wǎng)站設(shè)計、疏附網(wǎng)站制作等企業(yè)網(wǎng)站建設(shè)、網(wǎng)頁設(shè)計與制作、疏附企業(yè)網(wǎng)站模板建站服務(wù)，十載疏附做網(wǎng)站經(jīng)驗，不只是建網(wǎng)站，更提供有價值的思路和整體網(wǎng)絡(luò)服務(wù)。

下面是我的圖書購物車(自己寫的)

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;

/**

* 該類提供購物車的操作

* */

public class CartItemsService {

private MapString,BookCar itemMap=null;//購物車Map集合

private CollectionBookCar items;//購物車項

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()//獲得總金額

{

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)//根據(jù)圖書ID增加數(shù)量

{

BookCar bookCar=itemMap.get(bookid);

if(bookCar!=null)

{

bookCar.setQuantity(quantity);

}

}

public void clear(){

itemMap.clear();

}

}

修改后傳入這個方法就可以了setQuantityById()

★★★ 注意購物車一定要用Map 不能用List或ArrayList

因為購物車是顧客頻繁操作的功能

Map在取值或刪除值的效率比List或ArrayList要高的多

它基本不需要時間,而List或ArrayList還要遍歷。。。。。。

希望對你有幫助!!

java中寫商品購物車怎么實現(xiàn)每種商品總價都隨商品數(shù)量變化而變化？？

以前學(xué)習(xí)java又做個實例，挺值得學(xué)習(xí)的。1.首先我先列出我們所需要的java類結(jié)構(gòu)。1）Database.java---------模擬存儲商品的數(shù)據(jù)庫。2）McBean.java------------商品實體類，一個普通的javabean，里面有商品的基本屬性。3）OrderItemBean.java---訂單表。4）ShoppingCar.java------這個就是最主要的購物車，當(dāng)然比較簡單。5）TestShoppingCar.java---這個是測試類。2.下面貼出具體代碼并帶關(guān)鍵注釋。---Database.javapublicclassDatabase{/*采用Map存儲商品數(shù)據(jù)，為什么呢？我覺得這個問題你自己需要想下。*Integer為Map的key值，McBean為Map的value值。*/privatestaticMapdata=newHashMap();publicDatabase(){McBeanbean=newMcBean();bean.setId(1);bean.setName("地瓜");bean.setPrice(2.0);bean.setInstuction("新鮮的地瓜");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("絲瓜");bean.setPrice(1.5);bean.setInstuction("本地絲瓜");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;//商品編號privateStringname;//商品名privatedoubleprice;//商品價格privateStringinstuction;//商品說明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;//購物車所有商品總價格privateinttotalCount;//購物車所有商品數(shù)量privateMapitemMap;//商品編號與訂單項的鍵值對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("商品編號\t商品名稱\t單價\t購買數(shù)量\t總價");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("合計:總數(shù)量:"+df.format(totalCount)+"總價格:"+df.format(totalPrice));System.out.println("**********************************************");}}---OrderItemBean.javapublicclassOrderItemBean{privateMcBeanthing;//商品的實體privateintcount;//商品的數(shù)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);//購買商品編號1的商品s.buy(1);s.buy(2);s.buy(3);s.buy(1);s.show();//顯示購物車的信息s.delete(1);//刪除商品編號為1的商品s.show();s.clear();s.show();}}3.打印輸出結(jié)果商品編號商品名稱單價購買數(shù)量總價1地瓜￥23￥62土豆￥1.21￥1.23絲瓜￥1.51￥1.5合計:總數(shù)量:￥5總價格:￥8.7**********************************************商品編號商品名稱單價購買數(shù)量總價2土豆￥1.21￥1.23絲瓜￥1.51￥1.5合計:總數(shù)量:￥2總價格:￥2.7**********************************************商品編號商品名稱單價購買數(shù)量總價合計:總數(shù)量:￥0總價格:￥0**********************************************4.打字太累了，比較匆忙，但是主要靠你自己領(lǐng)會。哪里不清楚再提出來。

java簡單的購物車代碼

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);//選擇

System.out.println();

System.out.println("還要繼續(xù)購物嗎?(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("???????購物車清單");

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("哇哈哈純凈水:?"+value+"件，合計：￥"+Integer.parseInt(value)*3);

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

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

System.out.println("康師傅方便面:?"+value+"件，合計：￥"+Integer.parseInt(value)*5);

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

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

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

}

}

System.out.println("合計金額:￥"+hj);

}

public?static?void?init(){

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

System.out.println("\t商品列表\n");

System.out.println("??????????????商品名稱????????????????價格");

System.out.println("1.???哇哈哈純凈水????????￥3");

System.out.println("2.???康師傅方便面????????￥5");

System.out.println("3.???可口可樂????????????????￥4");

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

}

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

System.out.print("請輸入編號:");

String?bh?=?scan.nextLine();

System.out.print("請輸入購買數(shù)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 購物車示例代碼

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("面紙：3元",Label.LEFT);

label2=new Label("鋼筆：5元",Label.LEFT);

label3=new Label("書：10元",Label.LEFT);

label4=new Label("襪子：8元",Label.LEFT);

button1=new Button("加入購物車");

button2=new Button("加入購物車");

button3=new Button("加入購物車");

button4=new Button("加入購物車");

button5=new Button("查看購物車");

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("一個面紙、");

sum=sum+3;

}

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

{ text.append("一只鋼筆、");

sum=sum+5;

}

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

{ text.append("一本書、");

sum=sum+10;

}

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

{ text.append("一雙襪子、");

sum=sum+8;

}

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

{

text.append("\n"+"總價為："+"\n"+sum);

}

}

}

public class Shopping {

public static void main(String[] args) {

new ShopFrame("購物車");

}

}

我沒用Swing可能顯示不出來你的效果。不滿意得話我在給你編一個。

如何用java和jsp做一個簡單的購物車

頁面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易買網(wǎng)?-?首頁/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"

您現(xiàn)在的位置：a?href="Home"易買網(wǎng)/a?gt;?購物車

/div

div?class="wrap"

div?id="shopping"

form?action=""?method="post"

table

tr

th商品名稱/th

th商品價格/th

th購買數(shù)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"

dl

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}')"刪除/a/td

/tr

/c:forEach

/table

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

/form

/div

/div

div?id="footer"

Copyright?copy;??kaka??292817678?itjob??遠(yuǎn)標(biāo)培訓(xùn).?

/div

/body

/html

頁面關(guān)聯(lián)的js 自己去網(wǎng)上下載一個jquery

/*數(shù)量減少*/

function?sub(id,proId){

//購買數(shù)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';

//修改后的數(shù)量，購物明細(xì)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('修改失敗');

}*/

});

}

/**

*?數(shù)量增加

*?@param?{}?id

*/

function?addNum(id,proId){

//購買數(shù)量的值

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

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

edit(id,proId);

}

/**

*?刪除購物明細(xì)

*/

function?deleteItem(trId,proId){

//

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

//js刪除頁面節(jié)點

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

var?url?=?contextPath?+?'/HomeCarManager';

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

if(msg?==?'true'){

//js刪除頁面節(jié)點

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

}

});

}

后臺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;

/**

*?購物車處理類

*?@author?@author?ITJob?遠(yuǎn)標(biāo)培訓(xùn)

*

*/

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?{

//獲取商品的id

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

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

PrintWriter?writer?=?resp.getWriter();

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

//返回添加購物車成功

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

//根據(jù)商品的id查詢商品

try?{

Integer?pId?=?Integer.parseInt(proId);

Product?product?=?ps.findProductById(pId);

if(null?!=?product){

//查詢到了商品，將商品的相關(guān)參數(shù)構(gòu)建一個購物明細(xì)放入到購物車

Items?it?=?new?Items();

it.setProId(product.getProId());

it.setProName(product.getProName());

it.setProPrice(product.getProPrice());

it.setProImg(product.getProImg());

//先判斷session范圍是否有購物車

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

if(null?==?shopCar){

//購物車

shopCar?=?new?ArrayListItems();

}

//將商品加入到購物車之前，判斷購物車中是否已經(jīng)包含了該購物明細(xì)，如果包含了，只需要修改購買的數(shù)量

if(shopCar.contains(it)){

int?index??=?shopCar.indexOf(it);//尋找購物車中包含購物明細(xì)在購物車中位置

Items?items?=?shopCar.get(index);//獲取購物車中存在的購物明細(xì)

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

}?else?{

shopCar.add(it);

}

//將購物車放入到session訪問

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);

}

}

后臺管理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;

/**

*?購物車修改

*?@author?ITJob?遠(yuǎn)標(biāo)培訓(xùn)

*

*/

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();

//獲取參數(shù)

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);

//根據(jù)商品的id獲取對應(yīng)的明細(xì)項

//?先判斷session范圍是否有購物車

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?{

//刪除的操作

try?{

Integer?pId?=?Integer.parseInt(proId);

//根據(jù)商品的id獲取對應(yīng)的明細(xì)項

//?先判斷session范圍是否有購物車

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語言編寫的網(wǎng)上訂餐系統(tǒng)購物車功能如何實現(xiàn)？

用Vector 或者是HashMap去裝

下面有部分代碼你去看吧

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;

}

/**

*?得到訂餐列表

*?

*?@return

*/

public?List?changeToList(Map?carts)?{

//?將Set中元素轉(zhuǎn)換成數(shù)組，以便使用循環(huán)進(jìn)行遍歷

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

//?定義double變量total，用于存放購物車內(nèi)餐品總價格

double?total?=?0;

List?list?=?new?ArrayList();

//?循環(huán)遍歷購物車內(nèi)餐品，并顯示各個餐品的餐品名稱，價格，數(shù)量

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

//?從Map對象cart中取出第i個餐品，放入cartItem中

CartItemBean?cartItem?=?(CartItemBean)?carts

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

//?從cartItem中取出FoodBean對象

FoodBean?food1?=?cartItem.getFoodBean();

//?定義int類型變量quantity，用于表示購物車中單個餐品的數(shù)量

int?quantity?=?cartItem.getQuantity();

//?定義double變量price，表示餐品單價

double?price?=?food1.getFoodPrice();

//?定義double變量，subtotal表示單個餐品總價

double?subtotal?=?quantity?*?price;

//?//?計算購物車內(nèi)餐品總價格

total?+=?subtotal;

cartItem.setSubtotal(subtotal);

cartItem.setTotal(total);

list.add(cartItem);

}

return?list;

}

/**

*?增加訂餐

*/

public?Map?add(Map?cart,?String?foodID)?{

//?購物車為空

if?(cart?==?null)?{

cart?=?new?HashMap();

}

FoodModel?fd?=?new?FoodModel(conn);

FoodBean?food?=?fd.findFoodById(foodID);

//?判斷購物車是否放東西(第一次點餐)

if?(cart.isEmpty())?{

CartItemBean?cartBean?=?new?CartItemBean(food,?1);

cart.put(foodID,?cartBean);

}?else?{

//?判斷當(dāng)前菜是否在購物車中，false表示當(dāng)前菜沒有被點過。。

boolean?flag?=?false;

//?得到鍵的集合

Set?set?=?cart.keySet();

//?遍歷集合

Object[]?obj?=?set.toArray();

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

Object?object?=?obj[i];

//?如果購物車已經(jīng)存在當(dāng)前菜，數(shù)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)?{

//?把當(dāng)前菜放到購物車?yán)锩?/p>

CartItemBean?cartBean?=?new?CartItemBean(food,?1);

cart.put(foodID,?cartBean);

}

}

return?cart;

}

/**

*?取消訂餐

*/

public?Map?remove(Map?cart,?String?foodID)?{

cart.remove(foodID);

return?cart;

}

/**

*?更新購物車信息

*?

*?@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;

}

}

文章標(biāo)題：電商購物車java代碼 電商購物車java代碼是多少
文章出自：http://chinadenli.net/article32/doddssc.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供網(wǎng)站收錄、Google、App開發(fā)、定制開發(fā)、品牌網(wǎng)站制作、軟件開發(fā)

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時需注明來源： 創(chuàng)新互聯(lián)