deletefoodinfoservlet.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 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.bo.ShoppingCart;

public class DeleteFoodInfoServlet extends HttpServlet {


	public DeleteFoodInfoServlet() {
		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 {
		//创建一个session
		HttpSession session = request.getSession();
		//get values
		String showCartID = request.getParameter("flag");
		//取到购物车里的信息
		Object obj = session.getAttribute("cart");
		
		ShoppingCart cart = (ShoppingCart) obj;
		//调用在ShoppingCart里写好的一个方法删除购物车,转发到本页

		if(cart!=null){
			if(showCartID.equals("1")){
				if(cart!=null){
					request.getRequestDispatcher("view/shopCart.jsp").forward(request,response);
					return;
				}else{
					request.setAttribute("flag", true);
					request.getRequestDispatcher("view/shopCart.jsp").forward(request,response);
					return;
				}				
			}else{
				cart.deleteFoodInfo();
				request.setAttribute("flag", true);
			}
		}
		request.getRequestDispatcher("view/shopCart.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
	}

}