addfoodtocart.java

来自「jsp/serlvet/javaBean:订餐系统」· Java 代码 · 共 99 行

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.*;
import javax.servlet.http.*;

import java.util.*;
import bean.*;

public class AddFoodToCart extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public AddFoodToCart() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		request.setCharacterEncoding("GBK");
		//获取会话 
		HttpSession session=request.getSession(false);
		if(session==null){
			response.sendRedirect("/restrant/chJsp/books.jsp");
			return;
		}
		FoodBean bean=(FoodBean)session.getAttribute("foodToAdd");
		//创建购物车
		Map cart=(Map)session.getAttribute("cart");
		if(cart==null){
			cart=new HashMap();
			session.setAttribute("cart",cart);
		}
		//将物品放入购物车
		CartItemBean cartItem=(CartItemBean)cart.get(bean.getFoodID());
		if(cartItem!=null){
			cartItem.setQuantity(cartItem.getQuantity()+1);
		}else{
			cart.put(bean.getFoodID(),new CartItemBean(bean,1));
			
			//System.out.println("11111111111111111");
			
			response.sendRedirect("/restrant/chJsp/viewCart.jsp");
		}
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}