src/t/o/userServlet/shoppingcar.java

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package t.o.userServlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
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 t.o.bean.DBfood;
import t.o.bean.carBean;
import t.o.bean.foodBean;
import t.o.bean.randomno;

public class shoppingcar extends HttpServlet {
	ArrayList foodorderList = new ArrayList();
	int num = 1;
	Map<String, carBean> cart;

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

		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		PrintWriter out = response.getWriter();
		HttpSession session = request.getSession();
		
		String sqla = "select * from t_o_Food";
		session.setAttribute("foodList", DBfood.getfm(sqla));
		
		if(session.getAttribute("userName")==null){
			response.getWriter().write("<script language='JavaScript'>" +
					"alert('对不起，点餐系统只为本店会员开放，请登录！！！');" + 
					"history.back();" + 
					"</script>"
					);
		}
		else if(request.getParameter("foodnum")!=null){
			int foodnum = Integer.parseInt(request.getParameter("foodnum"));
			String food_no = request.getParameter("food_no");
			if(foodnum<1){
				cart.remove(food_no);
			}
			else{
				System.out.println(foodnum);
				cart.get(food_no).setQuantity(foodnum);
			}
			session.setAttribute("carsize", cart.size());
			response.getWriter().write("<script language='JavaScript'>" +
					//"alert('修改数量成功！');" + 
					"window.location.href('shopingcar.jsp');" + 
					"</script>"
					);
		}