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>
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脚本之家。