addshoppingcart.java

jsp购物车

package com.accp.addShoppingCart;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

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.accp.bean.UserShop;
import com.accp.bean.UserShopItem;
import com.accp.util.Util;

public class addShoppingCart extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public addShoppingCart() {
		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 {

	      HttpSession session=request.getSession();
	      String url="";
	      if(session==null)
	      {
	    	  url="index.jsp";
	      }
	      UserShop user=(UserShop)session.getAttribute("shopadd");
	      Map cart=(Map)session.getAttribute("cart");
	      if(cart==null)
	      {
	    	  cart=new HashMap();
	    	  session.setAttribute("cart",cart);
	      }
	     
	      UserShopItem shop=(UserShopItem)cart.get(user.getShopId());
	      if(shop!=null)
	      {
	    	  shop.setCount(shop.getCount()+1);
	      }else
	      {
	    	  cart.put(user.getShopId(),new UserShopItem(user,1));
	      }
	      url="cart.jsp";
	      Util.jump(request, response, url);
	}

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

}