这篇文章主要介绍“javaweb购物车功能的实现方法”，在日常操作中，相信很多人在javaweb购物车功能的实现方法问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”javaweb购物车功能的实现方法”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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
计算
安全
数据库
网络和加速
企业服务
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 >
<h2>书籍列表</h2>
<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 >
<h2>购物车列表</h2>
<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="${entry.value.quantity }" onchange="changeQuantity(this,${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>到此，关于“javaweb购物车功能的实现方法”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注亿速云网站，小编会继续努力为大家带来更多实用的文章！
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