用STRUTS ,HIBERNATE, SPRING 三种框架整合做的实战项目

				package com.ghy.data.order;
				
				
				import java.util.ArrayList;
				public class Control  {
					
					public ArrayList addGoods(OrderItem orderItem , ArrayList arrayList) {
						if (arrayList.size()==0) {
							arrayList.add(orderItem);
						}
						else {
							boolean find = false;
							for (int i = 0; i < arrayList.size(); i++) {
								OrderItem orderItem1 = (OrderItem) arrayList.get(i);
								// 如果存在直接修改购物车中相应物品信息
								if (orderItem1.getBookid().equals(orderItem.getBookid())) {
									// 修改数量
									orderItem1.setAmount(orderItem1.getAmount() + 1);
									// 修改总价
									orderItem1.setSubtotal();
									// 更新该物品信息
									arrayList.set(i, orderItem1);
									find = true;
									break;
								}
							}
							// 如果不存在，则添加这个物品
							if (!find) {
								arrayList.add(orderItem);
							}
						}
						return arrayList ;
					}
					//第一个参数为FORM过来的集合，第二个参数为CART过来的集合
					public ArrayList updateGoods(ArrayList listFromOrder , ArrayList listFromCart) {
						OrderItem orderItem1 ;
						OrderItem orderItem2 ;
						ArrayList arrayList = new ArrayList();
						for (int i = 0; i < listFromCart.size(); i++)
						{
							 orderItem1 = (OrderItem)listFromOrder.get(i);
							 orderItem2 = (OrderItem)listFromCart.get(i);
							 if(orderItem1.getChecked()==null)
							 {
								 orderItem2.setAmount(orderItem1.getAmount());
								 orderItem2.setSubtotal(); 
								 arrayList.add(orderItem2);
							 }
						}
						return arrayList ;
						
					}
				}