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旁隐穗车(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运卜 items) {

this.items = items;

}

public MapString, BookCar携轿 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!!

购物车的Java代码

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;public class ShoppingCartManager {

HashMapString, String hm=new HashMapString, String();

float totlePrice=0;

//添加book到购物车

public void addBook(String bookId,String bookQuantity){

if(hm.containsKey(bookId)){

int value=Integer.parseInt(hm.get(bookId));

value+=Integer.parseInt(bookQuantity);

hm.put(bookId, value+"");

}else{

hm.put(bookId, bookQuantity);

}

}

//修改数量

public void updateQuantity(String bookId,String bookQuantity){

hm.put(bookId, bookQuantity);

}

/誉高/获取购物车的所有信息 并计算总价

public ArrayListBookBean getShoppingCart(){

ArrayListBookBean al=new ArrayListBookBean();

IteratorString i=hm.keySet().iterator();

String ids="";

BookTableManager btm=new BookTableManager();

while(i.hasNext()){

ids=ids+","+i.next();

}

al= btm.selectByBookIds(ids);

totlePrice=0; //清空总价，防答虚启止无清如限累计

for(int j=0;jal.size();j++){

BookBean bb=al.get(j);

totlePrice+=bb.getPrice()*Integer.parseInt(getQuantityById(bb.getBookId()+""));

}

return al;

}

//获取总价

public float getTotlePrice(){

return totlePrice;

}

//根据ID获取数量

public String getQuantityById(String id){

String quantity=hm.get(id);

return quantity;

}

//清空购物车

public void clear(){

hm.clear();

}

//删除购物车中的一本书

public void deleteById(String id){

hm.remove(id);

}

}

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("书伍谈：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("加入购培贺物车");

button5=new Button("查看购物车");

text=new TextArea("商品有："配橘派+"\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。

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