650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M00/4B/F9/wKioL1Q2SYPRBh7ZAACQ5cOHFcE328.jpg "Title =" qq20141009163718.png "alt =" wkiol1q2syprbh7zaacq5cohfce328.jpg "/>
<%@ 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">
Shoppingcartitem. Java
public class ShoppingCartItem {private int number;private String bookName;private int price;//...}
Shoppingcart. Java shopping cart
public class ShoppingCart {//key:书名 value:ShoppingCartItem对象private Map<String, ShoppingCartItem> items = new HashMap<String, ShoppingCartItem>();private String bookName;public void addToCart(String bookName, int price) {this.bookName = bookName;if (items.containsKey(bookName)) {ShoppingCartItem shoppingCartItem = items.get(bookName);shoppingCartItem.setNumber(shoppingCartItem.getNumber() + 1);}else{ShoppingCartItem shoppingCartItem = new ShoppingCartItem();shoppingCartItem.setBookName(bookName);shoppingCartItem.setNumber(1);shoppingCartItem.setPrice(price);items.put(bookName, shoppingCartItem);}}public int getTotalBookNum() {int total = 0;for (ShoppingCartItem item:items.values()) {total += item.getNumber();}return total;}public int getTotalMoney() {int money = 0;for (ShoppingCartItem item:items.values()) {money += item.getNumber() * item.getPrice();}return money;}public String getBookName() {return bookName;}}
Addtocart. Java Servlet
String bookName = request.getParameter("id");int price = Integer.parseInt(request.getParameter("price"));ShoppingCart shoppingCart = (ShoppingCart) request.getSession().getAttribute("shoppingCart");if (shoppingCart == null) {shoppingCart = new ShoppingCart();request.getSession().setAttribute("shoppingCart", shoppingCart);}shoppingCart.addToCart(bookName, price);StringBuilder result = new StringBuilder();result.append("{")//必须用双引号.append("\"bookName\":\"" + bookName + "\"").append(",").append("\"totalBookNum\":" + shoppingCart.getTotalBookNum()).append(",").append("\"totalMoney\":" + shoppingCart.getTotalMoney()).append("}");response.setContentType("text/javascript");response.getWriter().print(result.toString());
This article is from the "Avatar" blog, please be sure to keep this source http://shamrock.blog.51cto.com/2079212/1561834
Ajax Study Notes-shopping cart
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