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這篇文章主要介紹“javaweb購物車功能的實現方法”，在日常操作中，相信很多人在javaweb購物車功能的實現方法問題上存在疑惑，小編查閱了各式資料，整理出簡單好用的操作方法，希望對大家解答”javaweb購物車功能的實現方法”的疑惑有所幫助！接下來，請跟著小編一起來學習吧！
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，具體內容如下
一、項目目錄結構
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——模擬數據庫
package com.DB;
import java.util.LinkedHashMap;
import java.util.Map;
import com.domain.Book;
import com.sun.org.apache.bcel.internal.generic.NEW;
//代表數據庫
//代表數據庫
public class DB {
private static Map map = new LinkedHashMap();
static{
map.put("1", new Book("1","javaweb開發","老張",38,"一本好書"));
map.put("2", new Book("2","jdbc開發","老黎",18,"一本好書"));
map.put("3", new Book("3","ajax開發","老佟",328,"一本好書"));
map.put("4", new Book("4","jbpm開發","老畢",58,"一本好書"));
map.put("5", new Book("5","struts開發","老方",28,"一本好書"));
map.put("6", new Book("6","spring開發","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，以及商品出現的次數（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;
//業務類，統一對web層提供所有服務
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 >
<h2>書籍列表</h2>
<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="${pageContext.request.contextPath}/servlet/ClearCartServlet" rel="external nofollow" ;
}
}
function changeQuantity(input,id,oldvalue){
var quantity = input.value; //得到要修改的數量 sdfsfs
/*
//檢查用戶輸入的數量是不是一個數字
if(isNaN(quantity)){
alert("請輸入數字！！");
input.value = oldvalue;
return;
}
*/
//檢查用戶輸入的數量是不是一個正整數
if(quantity<0 || quantity!=parseInt(quantity)){
alert("請輸入正整數！！");
input.value = oldvalue;
return;
}
var b = window.confirm("您確認把書的數量修改為:" + quantity);
if(b){
window.location.href="${pageContext.request.contextPath}/servlet/ChangeQuantityServlet?id=" rel="external nofollow" + id + "&quantity=" + quantity;
}
}
</script>
</head>
<body >
<h2>購物車列表</h2>
<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="${entry.value.quantity }" onchange="changeQuantity(this,${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>到此，關于“javaweb購物車功能的實現方法”的學習就結束了，希望能夠解決大家的疑惑。理論與實踐的搭配能更好的幫助大家學習，快去試試吧！若想繼續學習更多相關知識，請繼續關注億速云網站，小編會繼續努力為大家帶來更多實用的文章！
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