javaweb購物車案列學習開發(fā)

更新時間：2018年05月23日 17:08:50 作者：牛穿瘋

這篇文章主要為大家詳細介紹了javaweb購物車案列學習開發(fā)的相關(guān)資料，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了javaweb購物車案列的具體代碼，供大家參考，具體內(nèi)容如下

一、項目目錄結(jié)構(gòu)　　

二、源代碼

dao包——dao層：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——模擬數(shù)據(jù)庫

package com.DB;
import java.util.LinkedHashMap;
import java.util.Map;
import com.domain.Book;
import com.sun.org.apache.bcel.internal.generic.NEW;
//代表數(shù)據(jù)庫
//代表數(shù)據(jù)庫
public class DB {
 
 private static Map map = new LinkedHashMap();
 static{
 map.put("1", new Book("1","javaweb開發(fā)","老張",38,"一本好書"));
 map.put("2", new Book("2","jdbc開發(fā)","老黎",18,"一本好書"));
 map.put("3", new Book("3","ajax開發(fā)","老佟",328,"一本好書"));
 map.put("4", new Book("4","jbpm開發(fā)","老畢",58,"一本好書"));
 map.put("5", new Book("5","struts開發(fā)","老方",28,"一本好書"));
 map.put("6", new Book("6","spring開發(fā)","老方",98,"一本好書"));
 }
 
 
 public static Map getAll(){
 return map;
 }
 
}

domain包：

Book.java:書的實體類

package com.domain;
//書的實體類
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：購物車類　　　　

package com.domain;

import java.util.LinkedHashMap;
import java.util.Map;

//代表用戶的購物車

//代表用戶的購物車
public class Cart {

 private Map<String,CartItem> map = new LinkedHashMap();
 private double price; //記住購物車所有商品多少錢
 
 public void add(Book book){
 //看購物車中有沒有，要添加的書對應的購物項
 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:購物項　　　

package com.domain;
//用于代表某個商品，以及商品出現(xiàn)的次數(shù)（購物項）
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層

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;
//業(yè)務(wù)類，統(tǒng)一對web層提供所有服務(wù)
public class BusinessService {

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

 //刪除購物車中的購物項
 public void deleteCartItem(String id, Cart cart) {
 cart.getMap().remove(id);
 }
 
 //清空購物車
 public void clearCart(Cart cart) {
 cart.getMap().clear();
 }
 
 //改變購物項的數(shù)量
 public void changeItemQuantity(String id, String quantity, Cart cart) {
 CartItem item = cart.getMap().get(id);
 item.setQuantity(Integer.parseInt(quantity));
 }
 
}

web層：

ListBookServlet.java:顯示所有書籍　　　　　　

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;
//獲取所有書籍
//獲取所有書
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：處理購買請求　　　　　　

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;

//完成書籍購買
//完成書籍購買
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);
 
 //得到用戶的購物車
 Cart cart = (Cart) request.getSession().getAttribute("cart");
 if(cart==null){
  cart = new Cart();
  request.getSession().setAttribute("cart", cart);
 }
 
 //把書加到用戶購物車中,完成購買
 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:刪除某一種商品

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;
//刪除指定的購物項
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);
 
 //刪除成功
 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:清空購物車

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;
//清空購物車
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:修改購物車中指定商品的數(shù)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;

//把購物車中的書修改為指定數(shù)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頁面：

WebRoot/WEB-INF/jsp/listbook.jsp:顯示書籍列表

<%@ 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>書籍列表頁面</title>
 </head>
 
 <body style="text-align: center">
 
 <h1>書籍列表</h1>
 
 <table width="70%" border="1">
 <tr>
  <td>書名</td>
  <td>作者</td>
  <td>售價</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">購買</a>
  </td>
  </tr>
 </c:forEach>
 </table>
 
</body>

WebRoot/WEB-INF/jsp/listcart.jsp：顯示購物車列表

<%@ 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>購物車列表</title>
 
 <script type="text/javascript">
 function deleteitem(id){
  var b = window.confirm("您確認刪除嗎？？");
  if(b){
  window.location.href="${pageContext.request.contextPath }/servlet/DeleteItemServlet?id=" rel="external nofollow" +id;
  }
 }
 
 function clearcart(){
  var b = window.confirm("您確認清空嗎？？");
  if(b){
  window.location.href="${pageContext.request.contextPath}/servlet/ClearCartServlet" rel="external nofollow" ;
  }
 }
 
 function changeQuantity(input,id,oldvalue){
  var quantity = input.value; //得到要修改的數(shù)量 sdfsfs
  
  /*
  //檢查用戶輸入的數(shù)量是不是一個數(shù)字
  if(isNaN(quantity)){
  alert("請輸入數(shù)字！！");
  input.value = oldvalue;
  return;
  }
  */
  
  //檢查用戶輸入的數(shù)量是不是一個正整數(shù)
  if(quantity<0 || quantity!=parseInt(quantity)){
  alert("請輸入正整數(shù)??！");
  input.value = oldvalue;
  return;
  }  
  
  var b = window.confirm("您確認把書的數(shù)量修改為:" + 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>購物車列表</h1>
 
 <c:if test="${empty(cart.map)}"> 
 您沒有購買任何商品?。?！
 </c:if> 
 
 <c:if test="${!empty(cart.map)}"> 
 <table width="70%" border="1">
 <tr>
  <td>書名</td>
  <td>作者</td>
  <td>單價</td>
  <td>數(shù)量 </td>
  <td>小計</td>
  <td>操作</td>
 </tr>
 <c:forEach var="entry" items="${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 })">刪除</a> <!-- 去掉超鏈接默認行為 -->
   
  </td>
  </tr>
 </c:forEach>
 
 <tr>
  <td colspan="3">總價</td>
  <td colspan="2">${cart.price }元</td>
  <td colspan="1">
  <a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" onclick="clearcart()">清空購物車</a>
  </td>
 </tr>
 </table>
 </c:if>
 
 </body>
</html>

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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