javaweb购物车案列学习开发

本文实例为大家分享了javaweb购物车案列的具体代码，供大家参考，具体内容如下

一、项目目录结构　　

二、源代码

dao包——dao层：BookDao.java

package com.dao;

import java.util.Map;
import com.DB.DB;
import com.domain.Book;


public class BookDao {
 
 public Map getAll(){
 return DB.getAll();
 }
 
 public Book find(String id){
 return (Book) DB.getAll().get(id);
 }
} 

DB包：DB.java——模拟数据库

package com.DB;
import java.util.linkedHashMap;
import java.util.Map;
import com.domain.Book;
import com.sun.org.apache.bcel.internal.generic.NEW;
//代表数据库
//代表数据库
public class DB {
 
 private static Map map = new linkedHashMap();
 static{
 map.put("1", new Book("1","javaweb开发","老张",38,"一本好书"));
 map.put("2", new Book("2","jdbc开发","老黎",18,"一本好书"));
 map.put("3", new Book("3","ajax开发","老佟",328,"一本好书"));
 map.put("4", new Book("4","jbpm开发","老毕",58,"一本好书"));
 map.put("5", new Book("5","struts开发","老方",28,"一本好书"));
 map.put("6", new Book("6","spring开发","老方",98,"一本好书"));
 }
 
 
 public static Map getAll(){
 return map;
 }
 
}

domain包：

Book.java:书的实体类

package com.domain;
//书的实体类
public class Book { 
 private String id;
 private String name;
 private String author;
 private double price;
 private String description;

 public Book() {
 super();
 // TODO Auto-generated constructor stub
 }
 public Book(String id, String name, String author, double price,
  String description) {
 super();
 this.id = id;
 this.name = name;
 this.author = author;
 this.price = price;
 this.description = description;
 }
 public String getId() {
 return id;
 }
 public void setId(String id) {
 this.id = id;
 }
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
 public String getAuthor() {
 return author;
 }
 public void setAuthor(String author) {
 this.author = author;
 }
 public double getPrice() {
 return price;
 }
 public void setPrice(double price) {
 this.price = price;
 }
 public String getDescription() {
 return description;
 }
 public void setDescription(String description) {
 this.description = description;
 }
 
 
}

Cart.java：购物车类　　　　

package com.domain;

import java.util.linkedHashMap;
import java.util.Map;

//代表用户的购物车

//代表用户的购物车
public class Cart {

 private Map map = new linkedHashMap();
 private double price; //记住购物车所有商品多少钱
 
 public void add(Book book){
 //看购物车中有没有，要添加的书对应的购物项
 CartItem item = map.get(book.getId());
 if(item==null){
  item = new CartItem();
  item.setBook(book);
  item.setQuantity(1);
  map.put(book.getId(), item);
 }else{
  item.setQuantity(item.getQuantity()+1);
 }
 }
 
 public Map getMap() {
 return map;
 }
 public void setMap(Map map) {
 this.map = map;
 }
 public double getPrice() {
 double totalprice = 0;
 for(Map.Entry entry : map.entrySet()){
  CartItem item = entry.getValue();
  totalprice += item.getPrice();
 }
 this.price = totalprice;
 return price;
 }
 public void setPrice(double price) {
 this.price = price;
 }
}

CartItem.java:购物项　　　

package com.domain;
//用于代表某个商品，以及商品出现的次数（购物项）
public class CartItem {

 private Book book;
 private int quantity;
 private double price;
 
 
 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;
 }
 public double getPrice() {
 return price;
 }
 public void setPrice(double price) {
 this.price = price;
 }

}

service包：service层

BusinessService.java:　　　　　　

package com.service;

import java.util.Map;

import com.dao.BookDao;
import com.domain.Book;
import com.domain.Cart;
import com.domain.CartItem;
//业务类，统一对web层提供所有服务
public class BusinessService {

 private BookDao dao = new BookDao();
 
 public Map getAllBook(){
 return dao.getAll();
 }
 
 public Book findBook(String id){
 return dao.find(id);
 }

 //删除购物车中的购物项
 public void deleteCartItem(String id, Cart cart) {
 cart.getMap().remove(id);
 }
 
 //清空购物车
 public void clearCart(Cart cart) {
 cart.getMap().clear();
 }
 
 //改变购物项的数量
 public void changeItemQuantity(String id, String quantity, Cart cart) {
 CartItem item = cart.getMap().get(id);
 item.setQuantity(Integer.parseInt(quantity));
 }
 
}

web层：

ListBookServlet.java:显示所有书籍　　　　　　

package com.web.controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

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

import com.service.BusinessService;
//获取所有书籍
//获取所有书
public class ListBookServlet extends HttpServlet {

 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {

 BusinessService service = new BusinessService();
 Map map = service.getAllBook();
 request.setAttribute("map", map);
 
 request.getRequestDispatcher("/WEB-INF/jsp/listbook.jsp").forward(request, response);
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 doGet(request, response);
 }

}

 BuyServlet.java：处理购买请求　　　　　　

package com.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.domain.Book;
import com.domain.Cart;
import com.service.BusinessService;

//完成书籍购买
//完成书籍购买
public class BuyServlet extends HttpServlet {

 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {

 String id = request.getParameter("id");
 BusinessService service = new BusinessService();
 Book book = service.findBook(id);
 
 //得到用户的购物车
 Cart cart = (Cart) request.getSession().getAttribute("cart");
 if(cart==null){
  cart = new Cart();
  request.getSession().setAttribute("cart", cart);
 }
 
 //把书加到用户购物车中,完成购买
 cart.add(book);
 
 //response.sendRedirect("/WEB-INF/jsp/listcart.jsp");
 request.getRequestDispatcher("/WEB-INF/jsp/listcart.jsp").forward(request, response);
 
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 doGet(request, response);
 }

} 

DeleteItemServlet.java:删除某一种商品

package com.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.domain.Cart;
import com.service.BusinessService;
//删除指定的购物项
public class DeleteItemServlet extends HttpServlet {

 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {

 String id = request.getParameter("id");
 Cart cart = (Cart) request.getSession().getAttribute("cart");
 
 
 BusinessService service = new BusinessService();
 service.deleteCartItem(id,cart);
 
 //删除成功
 request.getRequestDispatcher("/WEB-INF/jsp/listcart.jsp").forward(request, response);
 
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 doGet(request, response);
 }

}

ClearCartServlet.java:清空购物车

package com.web.controller;

import java.io.IOException;
import java.io.PrintWriter;

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

import com.domain.Cart;
import com.service.BusinessService;
//清空购物车
public class ClearCartServlet extends HttpServlet {

 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {

 Cart cart = (Cart) request.getSession().getAttribute("cart");
 
 BusinessService service = new BusinessService();
 service.clearCart(cart);
 
 request.getRequestDispatcher("/WEB-INF/jsp/listcart.jsp").forward(request, response);
 
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 doGet(request, response);
 }

}

ChangeQuantityServlet.java:修改购物车中指定商品的数量

package com.web.controller;

import java.io.IOException;
import java.io.PrintWriter;

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

import com.domain.Cart;
import com.service.BusinessService;

//把购物车中的书修改为指定数量
public class ChangeQuantityServlet extends HttpServlet {

 public void doGet(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {

 String id = request.getParameter("id");
 String quantity = request.getParameter("quantity");
 
 Cart cart = (Cart) request.getSession().getAttribute("cart");
 
 BusinessService service = new BusinessService();
 service.changeItemQuantity(id,quantity,cart);
 

 request.getRequestDispatcher("/WEB-INF/jsp/listcart.jsp").forward(request, response);
 }

 public void doPost(HttpServletRequest request, HttpServletResponse response)
  throws ServletException, IOException {
 doGet(request, response);
 }

}

 jsp页面： 

WebRoot/WEB-INF/jsp/listbook.jsp:显示书籍列表 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>



 
 
 
 
 
 
 书籍列表
 
 
  

 

  
书名
  
作者
  
售价
  
描述 
  
操作
 
 

  
${entry.value.name }
  
${entry.value.author }
  
${entry.value.price }
  
${entry.value.description } 
  

   购买
  
  
 
 
 

WebRoot/WEB-INF/jsp/listcart.jsp：显示购物车列表

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>


 
 
 
 
 
 
 
 
 
 购物车列表
 
  
 您没有购买任何商品！！！
  
 
  
 
  

 

  
书名
  
作者
  
单价
  
数量 
  
小计
  
操作
 
 

  
${entry.value.book.name }
  
${entry.value.book.author }
  
${entry.value.book.price }
  

   
  
  
${entry.value.price }
  

   删除 
   
  
  
 
 
 

  
总价
  
${cart.price }元
  

  清空购物车
  
 
 
 
 
 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。