shoppingcarservlet.java

java网上订餐系统java网上订餐系统java网上订餐系统

package com.action;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.vo.FoodInfo;
import com.vo.CartBean;
import com.bo.ShoppingCart;
import com.bo.FoodInfoBo;

import java.util.Hashtable;

public class ShoppingCarServlet extends HttpServlet {


	public ShoppingCarServlet() {
		super();
	}


	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}


	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=UTF-8");		
		//get value 食物ID封装Bean
		String foodID = request.getParameter("foodId");
		//封装Bean
		FoodInfo info = new FoodInfo();
		info.setFoodID(foodID);
		
		FoodInfo foodInfo = null;
		//根据foodID从数据库里查询信息
		ArrayList list = FoodInfoBo.createFoodInfoBo().selectFoodInfo(info);
		//因为返回的是ArrayList数组，所以为转成FoodInfo Bean要用迭代转换
		Iterator it = list.iterator();
		if(it.hasNext()){
			Object obj = it.next();
			foodInfo = (FoodInfo) obj;
		}		
		//创建一个session
		HttpSession session = request.getSession();	
		//得到购物的信息
		ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
		//判断是否为空，为空创建，否则在HashMap里得到存在HashMap中的一条CartBean数据
		if(cart==null){
			cart = new ShoppingCart();
			cart.addFood(foodInfo);
		}else{
			HashMap<String,CartBean> mp = cart.getCart();
			//根据foodID得到一条相同的数据
			CartBean  cartBean =(CartBean)mp.get(foodID);
			//判断CartBean中是否存在相同的数据，不相同就ShoppingCart加一条，相同就条数加一
			if(cartBean==null){
				cart.addFood(foodInfo);
			}else{
				cart.updateFoodCount((cartBean.getFoodCount()+1), foodID);
			}
		}		
		//把	ShoppingCart设置在session范围内	
		session.setAttribute("cart", cart);		
		
		HashMap map=null;
	 	if(cart!=null){
	 		 map= cart.getCart();
	 	}else{	 		
	 		request.setAttribute("flag", true);
	 		request.getRequestDispatcher("view/shopCart.jsp").forward(request, response);
	 		return;
	 	}
    	session.setAttribute("cartBean",map);

		//转发到shopCart.jsp页
		request.getRequestDispatcher("view/shopCart.jsp").forward(request, response);
		//request.getRequestDispatcher("view/test1.jsp").forward(request, response);
	}


	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}


	public void init() throws ServletException {
		// Put your code here
	}

}