shoppingcartaddaction.java

一个不错的在线购物管理系统设计分析.有需要的自行下载.

/*
 * Created on 2005-10-26 
 * Author 曹汕 
 * Version 1.0 
 * Copyright by CS.SSPKU Inc. All rights reserved.
 */
package com.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import javax.servlet.ServletContext;
import javax.servlet.http.*;
import java.util.*;

import org.apache.struts.action.DynaActionForm;

import com.struts.utils.*;
import com.struts.business.*;
import com.struts.controller.impl.MemberControllerImpl;
import com.struts.controller.impl.ShoppingcartControllerImpl;

public final class ShoppingcartAddAction extends MemberBaseAction {
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {

		//从request中获取productId

		ServletContext context = servlet.getServletContext();

		int productId = Integer.parseInt(request.getParameter("productId"));
		
		int quantity = 1;

		//获取session
		HttpSession session = request.getSession(true);

		String PageForward;
		ActionMessages errors = new ActionMessages();
		
		Vector shoppingcart = (Vector) session.getAttribute(Constants.Shoppingcart_Key);
		if(shoppingcart==null)shoppingcart=new Vector();
		
		//添加商品到购物车,如果购物车中不存在则添加到购物车中,若已存在则转入出错页
		if(!ShoppingcartControllerImpl.getInstance().isInShoppingcart(shoppingcart,productId)){

			shoppingcart=ShoppingcartControllerImpl.getInstance().addShoppingcart(shoppingcart,productId, quantity);
			session.setAttribute(Constants.Shoppingcart_Key,shoppingcart);
			PageForward="toAddShoppingcart";
		}

		else{
			errors.add(ActionMessages.GLOBAL_MESSAGE,new ActionMessage("errors.alreadyBought"));
			if (!errors.isEmpty()) {
				saveErrors(request, errors);
			} 
			PageForward="toWrong";  
		}
		return mapping.findForward(PageForward);

	}

}