buyservlet.java

JSP+Mysql的网上订餐,用户有增删改除等功能,订单模块

package com.yy.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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.yy.bean.CartBean;
import com.yy.bean.FoodBean;
import com.yy.dao.FoodDao;

public class BuyServlet extends HttpServlet {


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

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

			String strid=request.getParameter("id");
			int id=Integer.parseInt(strid);
			FoodDao food=new FoodDao();
			Map map=food.addCart(id);
			HttpSession session=request.getSession();
			Object object=session.getAttribute("cart");
			Map car=null;
			if(object==null)
			{
				car=new HashMap();
			}else
			{
				car=(Map) object;
			}
			FoodBean bean=null;
			Set keys=car.keySet();
				if(keys.contains(id))
					{
						bean=(FoodBean)car.get(id);
						bean.setCount(bean.getCount()+1);
					}
				else
					{
						bean=food.GetfoodId(id);
						bean.setCount(bean.getCount()+1);
						
					}
						car.put(id, bean);
						session.setAttribute("cart", car);
        
						request.getRequestDispatcher("shopCart.jsp").forward(request, response);
		
	}


}