SSH(struts+spring+hibernate)迅速开发--第八章浏览和选购商品（5）

本文介绍了一个基于Java的购物车功能实现方案，包括商品列表展示、数量调整、删除操作及下单流程。通过Struts标签库和JSP技术实现前端交互。

i) shopCar.jsp页面主要实现购物车中商品列表的显示、改变购物车中某商品的数量、删除购物车中的某类商品、重新进入商品列表进行选购以及转入下单界面下单，代码清单如下：

<%@ page language="java" pageEncoding="UTF-8"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>

<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>

<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>

<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>

<html>

<head>

function selectMore(){

document.location.href="shop.do?method=find";

}

function toDelete(url){

document.location.href=url;

}

function toChange(url,obj){

//alert(obj.value);

document.location.href=url + obj.value;

}

function toSubmitOrder(){

document.location.href="order.do?method=toInitPage";

}

</script>

</head>

<body>

<html:form action="/shop.do">

<tr>

</tr>

<tr>

<tr>

</tr>

<tr>

</tr>

<logic:notEmpty name="shopForm" property="shops">

<logic:iterate id="shop" name="shopForm" property="shops" indexId="index">

<tr>

<td>${index+1}</td>

<input name="amout${index+1}" type="text" size="6" value='<bean:write name="shop" property="amount"/>' onChange="toChange('shop.do?method=changeShopAmount&shopId=${shop.shopId}&shopAmount=',this)">

</div></td>

<input type="button" name="delete${index+1}" value='<bean:message bundle="shop" key="shop.delete"/>' onClick="toDelete('shop.do?method=deleteShop&shopId=${shop.shopId}')">

</div></td>

</tr>

</logic:iterate>

</logic:notEmpty>

<tr>

<input type="button" name="submitOrder" value='<bean:message bundle="shop" key="shop.submit.order"/>' onclick="toSubmitOrder()">

<input type="button" value='<bean:message bundle="shop" key="shop.select.shop"/>' onclick="selectMore()">

</div></td>

</tr>

</table></td>

</tr>

<tr>

</tr>

</table>

</html:form>

<br>

</body>

</html>

1．其它用到的类

购物车类清单：

/**

package cn.com.book.demo.services;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

/**

* @author Noble.Yang

public class ShoppingCar {

//购物车中保存的是商品编号和对应的商品数量

private Map shops = new HashMap();

/**

* 往购物车中添加一个商品（编号）

* */

public void addShop(int shopId) {

this.addShop(shopId, 1);

}

/**

* 往购物车中添加一定数量的某个商品

* */

public void addShop(int shopId, int amount) {

//System.out.println("*****************");

String shopKey = String.valueOf(shopId);

Object objAmount = this.shops.get(shopKey);

Integer shopAmount = null;

if (objAmount != null) {

shopAmount = new Integer(((Integer) objAmount).intValue() + amount);

} else {

shopAmount = new Integer(amount);

}

//System.out.println("shop:" + shopKey + " amount:" + shopAmount);

this.shops.put(shopKey, shopAmount);

}

/**

* 更改购物车中某商品的数量

* */

public void change(int shopId, int amount){

String shopKey = String.valueOf(shopId);

this.shops.put(shopKey, new Integer(amount));

}

/**

* 全部清除某个商品

* */

public void removeShop(int shopId) {

this.shops.remove(String.valueOf(shopId));

}

/**

* 减少购物车中某个商品的数量

* */

public void removeShop(int shopId, int amount) {

String shopKey = String.valueOf(shopId);

Object objAmount = this.shops.get(shopKey);

int shopAmount = 0;

if (objAmount != null) {

shopAmount = ((Integer) objAmount).intValue() - amount;

if (shopAmount <= 0) {

this.shops.remove(shopKey);

} else {

this.shops.put(shopKey, new Integer(shopAmount));

}

/**

* 清空购物车

* */

public void clear(){

this.shops.clear();

}

/**

* 获取购物车中所有的商品以及对应的数量

* */

public int[] getShops() {

int[] shops = new int[this.shops.size() * 2];

if (this.shops.size() > 0) {

Set keys = this.shops.keySet();

Iterator iterator = keys.iterator();

if (iterator != null) {

int index = 0;

String key = null;

while(iterator.hasNext()){

key = (String)iterator.next();

shops[index] = Integer.parseInt(key);

index++;

shops[index] = ((Integer)this.shops.get(key)).intValue();

index++;

}

return shops;

}

public int getAmount(int shopId){

int amount = 0;

String shopKey = String.valueOf(shopId);

Object amountObj = this.shops.get(shopKey);

if(amountObj != null){

amount = ((Integer)amountObj).intValue();

}

return amount;

}

SSH(struts+spring+hibernate)迅速开发--第八章 浏览和选购商品（5）

SSH(struts+spring+hibernate)迅速开发--第八章浏览和选购商品（5）