web开发项目：网上购物系统

package org.whatisjava.dangdang.bo; import java.io.Serializable; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.Iterator; import java.util.List; import org.apache.log4j.Logger; import org.whatisjava.dangdang.dao.DaoFactory; import org.whatisjava.dangdang.dao.ProductDao; import org.whatisjava.dangdang.domain.Product; import org.whatisjava.dangdang.util.DaoException; public class Cart implements Serializable { private static final long serialVersionUID = 1L; private static Logger logger = Logger.getLogger(Cart.class); private Integer userId; // CartItem.product.id private HashMap<Integer, CartItem> items; /** * * @param user */ public Cart(Integer userId) { this.userId = userId; items = new HashMap<Integer, CartItem>(); } public Integer getUserId() { return userId; } /** * 如果Cart中已有该item，则不添加新的item，只将原有item中产品的数量加1 * @param product * @return */ public boolean addItem(Integer productId) throws DaoException { if (!items.containsKey(productId)) { CartItem item=new CartItem(); ProductDao dao=DaoFactory.getProductDao(); Product p=dao.findProductById(productId); item.setProduct(p); item.setNumber(1); item.setDrop(false); items.put(p.getId(), item); return true; }else{ CartItem item=items.get(productId); item.setNumber(item.getNumber()+1); return false; } } /** * * @param productId * @param num * @return */ public boolean updateNum(Integer productId, int num) { if(items.containsKey(productId)){ if(num<=0){ return this.drop(productId); } CartItem item=items.get(productId); item.setNumber(num); return true; } return false; } /** * * @param productId * @return */ public boolean drop(Integer productId) { if(items.containsKey(productId)){ CartItem item=items.get(productId); item.setDrop(true); return true; } return false; } /** * * @param productId * @return */ public boolean recovery(Integer productId) { if(items.containsKey(productId)){ CartItem item=items.get(productId); item.setDrop(false); return true; } return false; } /** * */ public void clear() { items.clear(); } /** * 把购物车的信息转换为字符串，用于Cookie存儲 * @return * @throws UnsupportedEncodingException */ public String serialize() { StringBuilder buffer=new StringBuilder(); buffer.append(userId).append("@"); if(items.isEmpty()){ buffer.append("0"); }else{ Iterator<Integer> it=items.keySet().iterator(); while(it.hasNext()){ Integer productId=it.next(); int num=items.get(productId).getNumber(); boolean drop=items.get(productId).isDrop(); buffer.append(productId+","+num+","+drop); buffer.append(";"); } } if(buffer.length()>0) buffer.deleteCharAt(buffer.length()-1); logger.debug(buffer); return buffer.toString(); } /** * 将Cookie中的字符串拆分成对象的属性 * @param content * @throws DaoException * @throws UnsupportedEncodingException */ public void load(String content) { this.items.clear(); String userId=content.substring(0,content.indexOf("@")); if(userId !=null && Integer.parseInt(userId)==this.userId){ content=content.substring(content.indexOf("@")+1); if(content==null || "0".equals(content)) return; if(content.length()>0){ String[] itemsArray=content.split(";"); for(int i=0;i<itemsArray.length;i++){ String[] itemArray=itemsArray[i].split(","); logger.debug(Arrays.toString(itemsArray)); Integer productId=Integer.parseInt(itemArray[0]); int num=Integer.parseInt(itemArray[1]); boolean drop=Boolean.parseBoolean(itemArray[2]); ProductDao dao=DaoFactory.getProductDao(); Product product=dao.findProductById(productId); CartItem item=new CartItem(); item.setProduct(product); item.setNumber(num); item.setDrop(drop); items.put(product.getId(),item); logger.debug(items); } } } } /** * * @return */ public boolean isEmpty() { return items.isEmpty(); } /** * * @return */ public List<CartItem> getItems() { List<CartItem> list = new ArrayList<CartItem>(); Iterator<Integer> it = items.keySet().iterator(); while (it.hasNext()) { CartItem item = items.get(it.next()); if (!item.isDrop()) { list.add(item); } } return list; } /** * * @return */ public List<CartItem> getDropItems() { List<CartItem> list = new ArrayList<CartItem>(); Iterator<Integer> it = items.keySet().iterator(); while (it.hasNext()) { CartItem item = items.get(it.next()); if (item.isDrop()) { list.add(item); } } return list; } /** * * @return */ public double getTotalPrice() { double totalPrice = 0; Iterator<Integer> it=items.keySet().iterator(); while(it.hasNext()){ CartItem item=items.get(it.next()); if(!item.isDrop()){ totalPrice+=item.getProduct().getFixedPrice()*item.getNumber(); } } return totalPrice; } /** * * @return */ public double getDangPrice() { double totalPrice = 0; Iterator<Integer> it=items.keySet().iterator(); while(it.hasNext()){ CartItem item=items.get(it.next()); if(!item.isDrop()){ totalPrice+=item.getProduct().getDangPrice()*item.getNumber(); } } return totalPrice; } }