jsp+servlet+javabean - 简单网上购物车 - 图文

public void setMap(Map map) { this.map = map; } public double getPrice() { double totalprice=0; for(Map.Entry me:map.entrySet()){ CartItem item=me.getValue(); totalprice+=item.getPrice(); } this.price=totalprice; return price; } public void setPrice(double price) { this.price = price; } }

//CartItem.java

package com.hbsi.domain;

//用于代表购买的商品（书）。包括书的数量。（购物项，购物车的一行） public class CartItem { private Book book; private int quantity;

private double price;//对此类书的价格计算（小计） public Book getBook() { return book; }

public void setBook(Book book) { this.book = book; }

public int getQuantity() { return quantity; }

public void setQuantity(int quantity) { this.quantity = quantity;

this.price=this.book.getPrice()*this.quantity;//书的单价乘以数量 }

public double getPrice() {

return price; }

public void setPrice(double price) { this.price = price;

} }

//BusinessService.java package com.hbsi.service;

import java.util.List;

import com.hbsi.domain.Book; import com.hbsi.domain.Cart;

public interface BusinessService { public List getAllBook(); //获取指定id的书 public Book findBook(String id); //删除购物项 public void deleteCartItem(String sid, Cart cart); //清空购物车 public void clearCart(Cart cart); //改变数量 public void changeQuantity(String sid, String quantity, Cart cart); }

//BusinessServiceImpl.java package com.hbsi.service;

import java.util.List;

import com.hbsi.dao.BookDao; import com.hbsi.dao.BookDaoImpl; import com.hbsi.domain.Book; import com.hbsi.domain.Cart; import com.hbsi.domain.CartItem;

public class BusinessServiceImpl implements BusinessService{ BookDao dao=new BookDaoImpl(); @Override public List getAllBook() { return dao.getAll(); }

@Override public void deleteCartItem(String sid, Cart cart) { cart.getMap().remove(sid); } @Override public Book findBook(String id) { return dao.find(id); } @Override public void clearCart(Cart cart) { cart.getMap().clear(); } @Override public void changeQuantity(String sid, String quantity, Cart cart) { CartItem item=cart.getMap().get(sid); item.setQuantity(Integer.parseInt(quantity)); } }

//db.properties

driver=com.mysql.jdbc.Driver

url=jdbc:mysql://localhost:3306/bookdb username=root password=root

//BuyServlet.java

package com.hbsi.web.controller;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;

import com.hbsi.domain.Book; import com.hbsi.domain.Cart;

import com.hbsi.service.BusinessServiceImpl;

public class BuyServlet extends HttpServlet {

BusinessServiceImpl service=new BusinessServiceImpl(); public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//1.获取要买的书

String sid=request.getParameter(\Book book =service.findBook(sid);

//2.得到购物车

Cart cart=(Cart)request.getSession().getAttribute(\if(cart==null){

cart=new Cart();

request.getSession().setAttribute(\}

//3.把数添加到购物车中 cart.add(book);

response.sendRedirect(\

//request.getRequestDispatcher(\rward(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response); } }

//ChangeQuantitySevlet.java

package com.hbsi.web.controller;