cartbean.java

电子商城：包括两个部分,一是前台销售程序

package com.publish.shop.order.javabeans;

import java.math.*;
import java.util.*;
import com.publish.shop.order.javabeans.ItemInfo;
import com.publish.shop.order.javabeans.LineItemModel;
import com.publish.shop.product.javabeans.ProductProxy;
import com.publish.shop.product.javabeans.ProductModel;

public class CartBean {
  private Map itemMap = new HashMap();
  private Collection items;
  public CartBean(){
  }
  public int getItemSize()  {
    return itemMap.size();
  }
  public boolean containsItemId(String itemId)  {
    return itemMap.containsKey(itemId);
  }
  public void clear()  {
    itemMap.clear();
  }
  public void addItem(ItemInfo item, boolean isInStock)  {
    try    {
      CartItem cartItem = (CartItem)itemMap.get(item.getItemId());
      if (cartItem == null)      {
        cartItem = new CartItem();
        cartItem.setItem(item);
        cartItem.setInStock(isInStock);
        cartItem.increaseQuantity();
        itemMap.put(item.getItemId(), cartItem);
        items = itemMap.values();
      }
      else{
        System.out.println("addItem----" + item.getItemId());
        cartItem.increaseQuantity();
      }
    }
    catch(Exception e) {
      System.out.println(e.getMessage());
      e.printStackTrace();
    }
  }
  public ItemInfo removeItemById(String itemId)  {
    CartItem cartItem = (CartItem)itemMap.remove(itemId);
    if (cartItem == null)
      return null;
    items = itemMap.values();
    return cartItem.getItem();
  }
  public void increaseQuantityByItemId(String itemId)  {
    CartItem cartItem = (CartItem)itemMap.get(itemId);
    cartItem.increaseQuantity();
  }
  public void setQuantityByItemId(String itemId, int quantity)  {
    CartItem cartItem = (CartItem)itemMap.get(itemId);
    cartItem.setQuantity(quantity);
  }
  public BigDecimal getItemTotal() {
    BigDecimal itemTotal = new BigDecimal("0");
    Iterator items = getAllCartItems();
    while(items.hasNext()) {
      CartItem cartItem = (CartItem)items.next();
      ItemInfo item = cartItem.getItem();
      BigDecimal listPrice = item.getListPrice();
      BigDecimal quantity = new BigDecimal(String.valueOf(cartItem.getQuantity()));
      itemTotal = itemTotal.add(listPrice.multiply(quantity));
    }
    return itemTotal;
  }
  public Iterator getAllCartItems()  {
    return itemMap.values().iterator();
  }
  public Collection getItems()  {
    return itemMap.values();
  }
  public void setItems(Collection collection)  {
    this.items = collection;
  }
  public ArrayList getItemList()  {
    if (getItemSize()==0)
      return null;
    ArrayList lList = new ArrayList();
    Iterator items = getAllCartItems();
    int i = 1;
    while(items.hasNext()){
      CartItem cartItem = (CartItem)items.next();
      ItemInfo item = cartItem.getItem();
      LineItemModel lModel = new LineItemModel();
      lModel.setItemId(item.getItemId());
      lModel.setShowId((new Integer(i)).toString());
      lModel.setProductId(item.getProductId());
      try{
        ProductProxy lpProxy = new ProductProxy();
        ProductModel model = lpProxy.queryProduct(item.getProductId());
        if (model == null)
          continue;
        lModel.setProductName(model.getProductName());
        lModel.setProductCount(model.getProductCount());
      }catch(Exception e)      {
        e.printStackTrace();
        continue;
      }
      lModel.setQuantity(new Integer(cartItem.getQuantity()).toString());
      lList.add(lModel);
      i++;
    }
    if (lList.size()==0)
      lList = null;
    return lList;
  }
}