用JSP实现的商城购物车模块

这两天，在学习JSP，正好找个小模块来练练手：

下面就是实现购物车模块的页面效果截图：

用JSP实现的商城购物车模块

图1. 产品显示页面通过此页面进行产品选择，添�到购物车

用JSP实现的商城购物车模块

图2 .购物车页面

用JSP实现的商城购物车模块

图3 . 商品数量设置

好了，先不贴图了，直接上代码；先看看项目的文档结构把（麻雀虽小，五脏俱全）：

用JSP实现的商城购物车模块

整个项目包括三个类，两个JSP页面，以下分别把他们的代码贴上：

Cart.java

package shopping.cart;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;


public class Cart {
	List<CartItem> items = new ArrayList<CartItem>();

	public List<CartItem> getItems() {
		return items;
	}

	public void setItems(List<CartItem> items) {
		this.items = items;
	}
	
	public void add(CartItem ci) {
		for (Iterator<CartItem> iter = items.iterator(); iter.hasNext();) {
			CartItem item = iter.next();
			if(item.getProduct().getId() == ci.getProduct().getId()) {
				item.setCount(item.getCount() + 1);
				return;
			}
		}
		
		items.add(ci);
	}
	
	public double getTotalPrice() {
		double d = 0.0;
		for(Iterator<CartItem> it = items.iterator(); it.hasNext(); ) {
			CartItem current = it.next();
			d += current.getProduct().getPrice() * current.getCount();
		}
		return d;
	}
	
	public void deleteItemById(String productId) {
		for (Iterator<CartItem> iter = items.iterator(); iter.hasNext();) {
			CartItem item = iter.next();
			if(item.getProduct().getId().equals(productId)) {
				iter.remove();
				return;
			}
		}
	}
	
}

CartItem.java

package shopping.cart;

import shopping.cart.Product;

public class CartItem {
	private Product product;

	private int count;

	public int getCount() {
		return count;
	}

	public void setCount(int count) {
		this.count = count;
	}

	public Product getProduct() {
		return product;
	}

	public void setProduct(Product product) {
		this.product = product;
	}
}

Product.java

package shopping.cart;
import java.io.Serializable;

public class Product implements Serializable {
	private String id;// 产品标识
	private String name;// 产品名称
	private String description;// 产品描写叙述
	private double price;// 产品价格

	public Product() {
	}

	public Product(String id, String name, String description, double price) {
		this.id = id;
		this.name = name;
		this.description = description;
		this.price = price;
	}


	public void setId(String id) {
		this.id = id;
	}

	public void setName(String name) {
		this.name = name;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	public String getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public String getDescription() {
		return description;
	}

	public double getPrice() {
		return price;
	}
}

以下是俩JSP页面源代码：

ShowProducts.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%@ page import="shopping.cart.*"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		
		<title>My JSP 'ShowProductsJSP.jsp' starting page</title>

		<meta http-equiv="pragma" content="no-cache">
		<meta http-equiv="cache-control" content="no-cache">
		<meta http-equiv="expires" content="0">
		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
		<meta http-equiv="description" content="This is my page">
		
	</head>

	<body bgcolor="#ffffff">
		<%
			Map products = new HashMap();
			products.put("1", new Product("1", "mp3播放器",
					"效果非常不错的mp3播放器，存储空间达1GB", 100.00));
			products.put("2", new Product("2", "数码相机", "象素500万，10倍光学变焦",
					500.00));
			products.put("3", new Product("3", "数码摄像机",
					"120万象素，支持夜景拍摄，20倍光学变焦", 200.00));
			products.put("4", new Product("4", "迷你mp4",
					"市面所能见到的最好的mp4播放器，国产", 300.00));
			products.put("5", new Product("5", "多功能手机",
					"集mp3播放、100万象素数码相机，手机功能于一体", 400.00));
			products.put("6", new Product("6", "多功能手机111",
					"集mp3播放23、100万象素数码相机111，手机功能于一体111",600.00));
			products.put("7", new Product("7", "11111111111",
					"集mp3播放23、100万象素数码相机111，手机功能于一体111",700.00));
			products.put("8", new Product("8", "2222222222",
					"集mp3播放23、100万象素数码相机111，手机功能于一体111",800.00));
			products.put("9", new Product("9", "33333333333333",
					"集mp3播放23、100万象素数码相机111，手机功能于一体111",900.00));
			session.setAttribute("products", products);
		%>
		<H1>
			产品显示
		</H1>

		<form name="productForm"
			action="http://localhost:8088/JSPlearning/ShopCartJSP.jsp"
			method="POST">
			<input type="hidden" name="action" value="purchase">
			<table border="1" cellspacing="0">
				<tr bgcolor="#CCCCCC">
					<tr bgcolor="#CCCCCC">
						<td>
							序号
						</td>
						<td>
							产品名称
						</td>
						<td>
							产品描写叙述
						</td>
						<td>
							产品单位价格（￥）
						</td>
			
                        <td>
							加入�到购物车
						</td>
					</tr>
					<%
						Set productIdSet = products.keySet();
						Iterator it = productIdSet.iterator();
						int number = 1;

						while (it.hasNext()) {
							String id = (String) it.next();
							Product product = (Product) products.get(id);
					%><tr>
						<td>
							<%=number++%>
						</td>
						<td>
							<%=product.getName()%>
						</td>
						<td><%=product.getDescription()%>
						</td>
						<td>
							<%=product.getPrice()%></td>
						<td>
							<a href="Buy.jsp?id=<%=product.getId()%>&action=add" target="cart">我要购买</a>
						</td>
					</tr>
					<%
						}
					%>
				
			</table>
			<p>
			</p>
		</form>
	</body>
</html>

Buy.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%@ page import="shopping.cart.*" %>

<%
Cart c = (Cart)session.getAttribute("cart");
if(c == null) {
	c = new Cart();
	session.setAttribute("cart", c);
}

double totalPrice = c.getTotalPrice();

request.setCharacterEncoding("GBK");
String action = request.getParameter("action");

Map products = (HashMap)session.getAttribute("products");

if(action != null && action.trim().equals("add")) {
	String id = request.getParameter("id");
	Product p = (Product)products.get(id);
	CartItem ci = new CartItem();
	ci.setProduct(p);
	ci.setCount(1);
	c.add(ci);
}

if(action != null && action.trim().equals("delete")) {
	String id = request.getParameter("id");
	c.deleteItemById(id);
}

if(action != null && action.trim().equals("update")) {
	for(int i=0; i<c.getItems().size(); i++) {
		CartItem ci = c.getItems().get(i);
		int count = Integer.parseInt(request.getParameter("p" + ci.getProduct().getId()));
		ci.setCount(count);
	}
}
 %> 

<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<%
List<CartItem> items = c.getItems();
%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>购物车</title>

</head>
<body>

<!-- c的值是：<%=(c == null) %> items的值是：<%=(items == null) %> -->
<form action="Buy.jsp" method="get">
<input type="hidden" name="action" value="update"/>
<table align="center" border="1">
	<tr>
		<td>产品ID</td>
		<td>产品名称</td>
		<td>购买数量</td>
		<td>单位价格</td>
		<td>总价</td>
		<td>处理</td>
	</tr>
	<%
	for(Iterator<CartItem> it = items.iterator(); it.hasNext(); ) {
		CartItem ci = it.next();
		%>
		<tr>
			<td><%=ci.getProduct().getId() %></td>
			<td><%=ci.getProduct().getName() %></td>
			<td>
				<input type="text" size=3 name="<%="p" + ci.getProduct().getId() %>" value="<%=ci.getCount() %>" 
					onkeypress="if (event.keyCode < 45 || event.keyCode > 57) event.returnValue = false;"
					onchange="document.forms[0].submit()">				
			</td>
			<td><%=ci.getProduct().getPrice() %></td>
			<td><%=ci.getProduct().getPrice()*ci.getCount() %></td>
			<td>
				
				<a href="Buy.jsp?action=delete&id=<%=ci.getProduct().getId() %>">删除</a>
				
			</td>
		</tr>
		<%
	}
	%>
	
	
	<tr>
		<td colspan=3 align="right">
			全部商品总价格为：
		</td>
		<td colspan=3><%=c.getTotalPrice() %></td>
	</tr>
	
	
	<tr>
	<!--	<td colspan=3>
			 <a href="javascript:document.forms[0].submit()">改动</a> 
		</td>  -->
		<td colspan=6 align="right">
			<a href="">下单</a>		
		</td>
	</tr>
</table>
</form>
</body>
</html>

配置好相关文件，在tomcat中公布后，在浏览器中输入http://localhost:8088/shopCart/ShowProducts.jsp 就可以进入产品展示页面，其他操作都能够在页面上完毕！

注意：我使用的tomcatport（8088）被自己改过，假设没改过tomcatport的童鞋，默认port为8080。

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