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javaweb购物车案列学习开发

时间：2023-02-02 10:12:48|栏目：JAVA代码|点击： 次

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<String,CartItem> 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<String, CartItem> getMap() {
 return map;
 }
 public void setMap(Map<String, CartItem> map) {
 this.map = map;
 }
 public double getPrice() {
 double totalprice = 0;
 for(Map.Entry<String, CartItem> 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" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 <title>书籍列表页面</title>
 </head>
 
 <body style="text-align: center">
 
 <h1>书籍列表</h1>
 
 <table width="70%" border="1">
 <tr>
  <td>书名</td>
  <td>作者</td>
  <td>售价</td>
  <td>描述 </td>
  <td>操作</td>
 </tr>
 <c:forEach var="entry" items="${map}">
  <tr>
  <td>${entry.value.name }</td>
  <td>${entry.value.author }</td>
  <td>${entry.value.price }</td>
  <td>${entry.value.description } </td>
  <td>
   <a href="${pageContext.request.contextPath }/servlet/BuyServlet?id=${entry.value.id }" rel="external nofollow" target="_blank">购买</a>
  </td>
  </tr>
 </c:forEach>
 </table>
 
</body>

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" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 <title>购物车列表</title>
 
 <script type="text/javascript">
 function deleteitem(id){
  var b = window.confirm("您确认删除吗？？");
  if(b){
  window.location.href="${pageContext.request.contextPath }/servlet/DeleteItemServlet?id=" rel="external nofollow" +id;
  }
 }
 
 function clearcart(){
  var b = window.confirm("您确认清空吗？？");
  if(b){
  window.location.href="${pageContext.request.contextPath}/servlet/ClearCartServlet" rel="external nofollow" ;
  }
 }
 
 function changeQuantity(input,id,oldvalue){
  var quantity = input.value; //得到要修改的数量 sdfsfs
  
  /*
  //检查用户输入的数量是不是一个数字
  if(isNaN(quantity)){
  alert("请输入数字！！");
  input.value = oldvalue;
  return;
  }
  */
  
  //检查用户输入的数量是不是一个正整数
  if(quantity<0 || quantity!=parseInt(quantity)){
  alert("请输入正整数！！");
  input.value = oldvalue;
  return;
  }  
  
  var b = window.confirm("您确认把书的数量修改为:" + quantity);
  if(b){
  window.location.href="${pageContext.request.contextPath}/servlet/ChangeQuantityServlet?id=" rel="external nofollow" + id + "&quantity=" + quantity;
  }
 }
 </script>
 
 </head>
 
 <body style="text-align: center">
 
 <h1>购物车列表</h1>
 
 <c:if test="${empty(cart.map)}"> 
 您没有购买任何商品！！！
 </c:if> 
 
 <c:if test="${!empty(cart.map)}"> 
 <table width="70%" border="1">
 <tr>
  <td>书名</td>
  <td>作者</td>
  <td>单价</td>
  <td>数量 </td>
  <td>小计</td>
  <td>操作</td>
 </tr>
 <c:forEach var="entry" items="${cart.map}">
  <tr>
  <td>${entry.value.book.name }</td>
  <td>${entry.value.book.author }</td>
  <td>${entry.value.book.price }</td>
  <td>
   <input type="text" name="quantity" value="${entry.value.quantity }" style="width:35px" onchange="changeQuantity(this,${entry.key},${entry.value.quantity})">
  </td>
  <td>${entry.value.price }</td>
  <td>
   <a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" onclick="deleteitem(${entry.key })">删除</a> <!-- 去掉超链接默认行为 -->
   
  </td>
  </tr>
 </c:forEach>
 
 <tr>
  <td colspan="3">总价</td>
  <td colspan="2">${cart.price }元</td>
  <td colspan="1">
  <a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" onclick="clearcart()">清空购物车</a>
  </td>
 </tr>
 </table>
 </c:if>
 
 </body>
</html>

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