shoppingcartactions.java

来自「《基于Eclipse的开源框架技术与实战》[第5章]随书源码」· Java 代码 · 共 137 行

package com.free.struts.storefront.order;

import java.io.IOException;
import java.text.Format;
import java.text.NumberFormat;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import org.apache.struts.action.*;
import org.apache.struts.actions.DispatchAction;

import com.free.struts.storefront.catalog.view.ItemDetailView;
import com.free.struts.storefront.framework.ShoppingCart;
import com.free.struts.storefront.framework.ShoppingCartItem;
import com.free.struts.storefront.framework.StorefrontDispatchAction;
import com.free.struts.storefront.framework.UserContainer;
import com.free.struts.storefront.framework.util.IConstants;
import com.free.struts.storefront.service.IStorefrontService;

/**
 * <p>Title: Eclipse Plugin Development</p>
 * <p>Description: Free download</p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: Free</p>
 * @author gan.shu.man
 * @version 1.0
 */

public class ShoppingCartActions extends StorefrontDispatchAction {
  /**
   * 查看当前购物车的状态,转到shoppingcart.jsp面面
   */
  public ActionForward view(ActionMapping mapping,
                            ActionForm form,
                            HttpServletRequest request,
                            HttpServletResponse response)
    throws Exception {

    //确保存UserContainer已经创建
    UserContainer userContainer = getUserContainer(request);
    return mapping.findForward(IConstants.SUCCESS_KEY);
  }
 /**
  * 更新购物车中的商品以及数量
  */
  public ActionForward update(ActionMapping mapping,
                              ActionForm form,
                              HttpServletRequest request,
                              HttpServletResponse response)
    throws Exception {

     updateItems(request);
     updateQuantities(request);
     return mapping.findForward(IConstants.SUCCESS_KEY);
  }

 /**
  * 添加商品到购物车
  */
  public ActionForward addItem(ActionMapping mapping,
                               ActionForm form,
                               HttpServletRequest request,
                               HttpServletResponse response)
    throws Exception {
    System.out.println( "IN add item" );

    UserContainer userContainer = getUserContainer(request);
    System.out.println( "user container is " + userContainer );
    System.out.println( "Begin" );
    System.out.println( "Looking: " + request.getSession().getAttribute( IConstants.USER_CONTAINER_KEY ));
    System.out.println( "End" );

    //获得商品的ID
    String itemId = request.getParameter( IConstants.ID_KEY );
    String qtyParameter = request.getParameter( IConstants.QTY_KEY );

    int quantity = 1; // Default value to add
    if(qtyParameter != null) {
      Locale userLocale = userContainer.getLocale();
      Format nbrFormat = NumberFormat.getNumberInstance(userLocale);
      try {
        Object obj = nbrFormat.parseObject(qtyParameter);
        quantity = ((Number)obj).intValue();
      }
      catch(Exception ex) {
        ex.printStackTrace();
      }
    }

    IStorefrontService serviceImpl = getStorefrontService();
    ItemDetailView itemDetailView = serviceImpl.getItemDetailView( itemId );

    //添加商品到购物车中
    userContainer.getCart().addItem(new ShoppingCartItem(itemDetailView, quantity));
    return mapping.findForward(IConstants.SUCCESS_KEY);
  }

 /**
  * 更新购物车中的商品，
  * 当前只有删除商品时会更新购物车中商品的数量
  */
  private void updateItems(HttpServletRequest request) {
    // Multiple checkboxes with the name "deleteCartItem" are on the
    // form. The ones that were checked are passed in the request.
    String[] deleteIds = request.getParameterValues("deleteCartItem");

    // Build a List of item ids to delete
    if(deleteIds != null && deleteIds.length > 0) {
      int size = deleteIds.length;
      List itemIds = new ArrayList();
      for(int i = 0;i < size;i++) {
        itemIds.add(deleteIds[i]);
      }
      //删除购物车中的商品
      UserContainer userContainer = getUserContainer(request);
      userContainer.getCart().removeItems(itemIds);
    }
  }

 /**
  * 更新购物车中商品的数量
  */
  private void updateQuantities(HttpServletRequest request) {
    Enumeration enumType = request.getParameterNames();
    while(enumType.hasMoreElements()) {
      String paramName = (String)enumType.nextElement();
      if(paramName.startsWith("qty_")) {
        String id = paramName.substring(4, paramName.length());
        String qtyStr = request.getParameter(paramName);
        if(id != null && qtyStr != null) {
          ShoppingCart cart = getUserContainer(request).getCart();
          cart.updateQuantity(id, Integer.parseInt(qtyStr));
        }
      }
    }
  }
}