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最新推荐文章于 2025-07-29 22:59:06 发布

sunvsjay1890

最新推荐文章于 2025-07-29 22:59:06 发布

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CC 4.0 BY-SA版权

文章标签： border integer class image javascript 产品

本文链接：https://blog.youkuaiyun.com/sunvsjay1890/article/details/8054085

本文介绍了一个简单的购物车实现方案，包括如何添加、删除商品，计算总价等功能。通过Java类和Struts框架实现购物车的基本操作，并展示了购物车页面的设计。

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vo里面写的ShoppingCar.java类

package com.bt.vo;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class ShoppingCar {
	private Map<ProductVO, Integer> map = new HashMap<ProductVO, Integer>();

	// 向购物车增加一个产品
	public void addProduct(ProductVO vo) {
		if (map.containsKey(vo)) {// 判断该物品是否已经在购物车中
			int value = map.get(vo);// 如果已经有盖类型的物品，则取出该物品的数量
			value++;// 修改数量
			map.put(vo, value);
		} else {
			map.put(vo, 1);// 如果盖物品不存在，则直接加入，数量初始化为1个
		}
	}

	public void clear() {
		map.clear();

	}

	// 从购物车中移除产品
	public void remove(Integer id, int num) {
		ProductVO key = new ProductVO();// 移除集合中的元素需要key，需要ProductVO作为key
		key.setProductid(id);

		int value = map.get(key).intValue();// 根据key查找对应的产品数量
		if (num < value) {// 判断你要移除的商品个数是否小于购买量
			value -= num;// 小于已购买量则减去num
			map.put(key, value);// 重新修改产品对应的数量
		} else if (num == value) {// 如果要减去该产品所有的购买数
			map.remove(key);// 则直接将该产品移除
		}
	}

	public Map<ProductVO, Integer> getMap() {
		return map;
	}

	// 计算购物车总价格
	public double getTotal() {
		double total = 0.0;
		// 需要将每个产品的价格和数量相乘，计算总价格
		Iterator<ProductVO> it = map.keySet().iterator();// 列举所有产品的集合
		while (it.hasNext()) {
			ProductVO vo = it.next();
			// 取出该产品的购买数量
			int num = map.get(vo).intValue();
			// 取出该产品的单价
			double price = vo.getBaseprice();
			// 计算该类产品的总价格
			double sum = price * num;
			// 计算购物车所有产品的总价格
			total += sum;
		}

		return total;
	}

	public static void main(String[] args) {
		ProductVO vo1 = new ProductVO();
		vo1.setBaseprice(20);
		vo1.setProductid(3);

		ProductVO vo2 = new ProductVO();
		vo2.setBaseprice(20);
		vo2.setProductid(3);

		ProductVO vo3 = new ProductVO();
		vo3.setBaseprice(8);
		vo3.setProductid(4);

		ProductVO vo4 = new ProductVO();
		vo4.setBaseprice(8);
		vo4.setProductid(4);

		ShoppingCar car = new ShoppingCar();
		car.addProduct(vo1);
		car.addProduct(vo2);
		car.addProduct(vo3);
		car.addProduct(vo4);

		System.out.println(car.getTotal());

		car.remove(4, 1);

		System.out.println(car.getTotal());

	}

}

action里面

package com.bt.control;

import java.util.Map;

import com.bt.service.ProductService;
import com.bt.util.WebConstant;
import com.bt.vo.ShoppingCar;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class ShoppingCarAction extends ActionSupport {
	private Integer productid;

	private ProductService ps;

	public void setPs(ProductService ps) {
		this.ps = ps;
	}

	public Integer getProductid() {
		return productid;
	}

	public void setProductid(Integer productid) {
		this.productid = productid;
	}

	/**
	 * 每当购物时，就要判断是否已经有购物车了， 如果是第一次购物，就给一个购物车实例，并保存在session中
	 * 
	 * @return
	 */
	public String add() {
		// 在Action中访问ServletAPI，获取session
		Map<String, Object> session = ActionContext.getContext().getSession();
		// 判断是否第一次登录，因为只要登录，就会在session中保存该对象的信息
		Object obj = session.get(WebConstant.SESSION_CURRENT_USER);
		// 准备一个购物车对象
		ShoppingCar car = null;
		// 如果已经登录
		if (obj != null) {
			// 判断是否已经有购物车了，如果没有，就实例化一个并保存在session中
			Object temp_object = session.get(WebConstant.SESSION_CURRENT_CAR);
			// 如果还没有购物车
			if (temp_object == null) {
				// 实例化一个购物车
				car = new ShoppingCar();
				// 然后将购物车放入session中，为下次购物做准备
				session.put(WebConstant.SESSION_CURRENT_CAR, car);
			} else {
				// 如果已经有购物车了，则将对象还原为购物车对象
				car = (ShoppingCar) temp_object;
			}

			// 将购买的产品放入购物车，调用ProductService的load方法访问数据库，获得所购书籍的详细信息
			car.addProduct(ps.load(productid));

			return SUCCESS;// 成功后跳转至shopcart.jsp页面
		} else {
			return ERROR;// 如果没有登录则重新定位到login.jsp页面
		}
	}

}

struts_car.xml配置文件 ()页面可以点击购买超链接传过来

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>

<package name="car" extends="struts-default" namespace="/car">
 <action name="add" class="caraction" method="add">
   <result name="success">/shopcart.jsp</result>
    <result name="error">/login.jsp</result>
 </action>

</package>
</struts>

购物车的jsp页面

<%@page import="com.bt.vo.ProductVO"%>
<%@page import="com.bt.vo.ShoppingCar"%>
<%@page import="com.bt.util.WebConstant"%>
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

ShoppingCar car=(ShoppingCar)session.getAttribute(WebConstant.SESSION_CURRENT_CAR);

Iterator<ProductVO> it=car.getMap().keySet().iterator();
%>
<!--文件头开始-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
		<meta name="description" content="电子商务门户">
		<title>电子商务门户</title>
		<LINK href="<%=basePath%>css/test.css" rel=stylesheet>
		<script language = "JavaScript" src = "<%=basePath%>js/test.js"></script>
	</head>
	<body onLoad="MM_preloadImages('<%=basePath%>images/index_on.gif','<%=basePath%>images/reg_on.gif','<%=basePath%>images/order_on.gif','<%=basePath%>images/top/topxmas/jp_on.gif','<%=basePath%>images/top/topxmas/download_on.gif','<%=basePath%>images/top/topxmas/bbs_on.gif','<%=basePath%>images/top/topxmas/designwz_on.gif')" topmargin="0" leftmargin="0" rightmargin="0" bottommargin="0">
		<table width="100%" border="0" cellspacing="0" cellpadding="0" id="table2">
		  <tr>
		    <td align="left" width="7%" background="<%=basePath%>images/top_bg.gif"><img src="<%=basePath%>images/logo.gif" width="286" height="58"></td>
		    <td width="62%" background="<%=basePath%>images/top_bg.gif">　</td>
		    <td width="31%" background="<%=basePath%>images/top_r.gif" align="right">
			<a href="<%=basePath%>login.jsp">[登录]</a>
			<a href="<%=basePath%>register.jsp">[注册]</a>     </td>
		  </tr>
		</table>
		<table width="100%" border="0" cellspacing="0" cellpadding="0">
		  <tr>
		    <td background="<%=basePath%>images/dh_bg.gif" align="left" height="12">
		      <table width="100" border="0" cellspacing="0" cellpadding="0" align="center">
		        <tr>
		          <td width="5%">　</td>
		          <td width="10%"><a href="<%=basePath%>index.jsp" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('<%=basePath%>image1','','<%=basePath%>images/index_on.gif',1)">
					<img name="<%=basePath%>image1" border="0" src="<%=basePath%>images/index.gif" width="90" height="36"></a></td>
		          <td width="10%"><a href="<%=basePath%>user/userinfo.jsp" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('<%=basePath%>image2','','<%=basePath%>images/reg_on.gif',1)">
					<img name="<%=basePath%>image2" border="0" src="<%=basePath%>images/reg.gif" width="92" height="36"></a></td>
		          <td width="10%"><a href="<%=basePath%>shopcart.jsp" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('<%=basePath%>image4','','<%=basePath%>images/carts_on.gif',1)">
					<img name="<%=basePath%>image4" border="0" src="<%=basePath%>images/cart.gif" width="92" height="36"></a></td>
		          <td width="10%"><a href="<%=basePath%>user/order.jsp" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('<%=basePath%>image5','','<%=basePath%>images/order_on.gif',1)">
					<img name="<%=basePath%>image5" border="0" src="<%=basePath%>images/order.gif" width="92" height="36"></a></td>
		          <td width="10%"><a href="<%=basePath%>user/logout.action" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('<%=basePath%>image6','','<%=basePath%>images/exit_on.gif',1)">
					<img name="<%=basePath%>image6" border="0" src="<%=basePath%>images/exit.gif" width="92" height="36"></a></td>
		        </tr>
		      </table>
		    </td>
		  </tr>
		</table>
		<table cellspacing="1" cellpadding="3" align="center" border="0" width="98%">
		<tr>
		<td width="65%"><BR>
		>> 欢迎访问 <b>电子商务门户</b> </td>
		<td width="35%" align="right">

		</td></tr></table>



<!--文件体开始-->

		<table cellspacing=1 cellpadding=3 align=center class=tableBorder2>
		<tr>
		<td height=25 valign=middle>
                  <img src="<%=basePath%>images/Forum_nav.gif" align="absmiddle">
                  <a href="<%=basePath%>index.jsp">电子商务门户</a> →
					<img border="0" src="<%=basePath%>images/dog.gif" width="19" height="18">
					购物清单
                </td>
                </tr>
		</table>
              <br>

		<table cellpadding=3 cellspacing=1 align=center class=tableborder1>
		<tr>
			<td valign=middle align=center height=25 background="<%=basePath%>images/bg2.gif" width=""><font color="#ffffff"><b>序号</b></font></td>
			<td valign=middle align=center height=25 background="<%=basePath%>images/bg2.gif" width=""><font color="#ffffff"><b>产品名称</b></font></td>
			<td valign=middle align=center height=25 background="<%=basePath%>images/bg2.gif" width=""><font color="#ffffff"><b>价格</b></font></td>
			<td valign=middle align=center height=25 background="<%=basePath%>images/bg2.gif" width=""><font color="#ffffff"><b>数量</b></font></td>
			<td valign=middle align=center height=25 background="<%=basePath%>images/bg2.gif" width=""><font color="#ffffff"><b>合计</b></font></td>
			<td valign=middle align=center height=25 background="<%=basePath%>images/bg2.gif" width=""><font color="#ffffff"><b>操作</b></font></td>
		</tr>
        
        <%
        int count=0;
        while(it.hasNext()){
           ProductVO vo=it.next();
           int num=car.getMap().get(vo).intValue();
           count++;
        %>
                   
		<tr>
			<form method="post" action="updateAction.do" name="f1">
			<input type="hidden" name="productid" value="<%=vo.getProductid()%>">
			<input type="hidden" name="number" value="<%=vo.getProductid()%>">
			<td class=tablebody2 valign=middle align=center width=""><%=count%></td>
			<td class=tablebody1 valign=middle width="">  <a href="<%=basePath%>product/showDetail.action?productid=<%=vo.getProductid()%>"><%=vo.getName()%></a></td>
			<td class=tablebody2 valign=middle align=center width="">￥<%=vo.getBaseprice()%></td>
			<td class=tablebody1 valign=middle align=center width=""><%=num%></td>
			<td class=tablebody2 valign=middle align=left width="">  ￥<%=(vo.getBaseprice()*num)%></td>
			<td class=tablebody1 valign=middle align=center width="">
			<input type="button" value="取消" onclick="javascript:window.location='removeProductAction.do?productid=2';"> <input type="submit" value="保存修改"></td>
			</form>
		</tr>
         <%}%>    
		<tr>
			<td class=tablebody1 valign=middle align=center colspan="4">　</td>
			<td class=tablebody1 valign=middle align=left width="">  <font color="#ff0000"><b><%=car.getTotal()%></b></font></td>
			<td class=tablebody1 valign=middle align=center width="">　</td>
		</tr>
		<tr>
			<td class=tablebody2 valign=middle align=center colspan="6"><input type="button" value="提交订单" onclick="javascript:window.location='<%=basePath%>order/create.action';"> <input type="button" value="继续购物" onclick="javascript:window.location='<%=basePath%>index.jsp';"> <input type="button" value="清空购物车" onclick="javascript:window.location='removeAllProductAction.do';"></td>
		</tr>
                </table><br>
<!--文件尾开始-->
		<tab
		le width="100%" border="0" cellspacing="0" cellpadding="0" align="center" height="28">
		  <tr>
		    <td height="17" background="<%=basePath%>images/bot_bg.gif">
		      　</td>
		  </tr>
		</table>
		<table width="100%" border="0" cellspacing="0" cellpadding="0" align="center">
		  <tr>
		    <td bgcolor="#f1f1f6" height="53" valign="center">
			<p align="center">Copyright ©2004 - 2012 <a href="<%=basePath%>index.jsp"><b><font face="Verdana,">test</font></b><font color=#CC0000>.com.cn</font></b></a><br>
			</td>
		  </tr>
		</table>
	</body>
</html>