cartmanager.java

电子商城

package com.lmh.servlet.font;

import java.io.IOException;

import javax.servlet.RequestDispatcher;
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.lmh.Cart;

public class CartManager extends HttpServlet {

	/**
	 * 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();

		Cart cart = (Cart) session.getAttribute("cart");
		String mcID_str = request.getParameter("mcID");
		String newCount_str = request.getParameter("newCount");
		String action = request.getParameter("action");
		int mcID = -1;
		int newCount = 0;

		if (mcID_str != null &&! mcID_str.equalsIgnoreCase("")) {
			mcID = Integer.parseInt(mcID_str);
		}
		if (newCount_str != null && !newCount_str.equalsIgnoreCase("")) {
			newCount = Integer.parseInt(newCount_str);
		}
		if (mcID != -1 && !action.equals("")) {
			if (action.equalsIgnoreCase("add")) {
				cart.addMc(mcID);
			} else if (action.equalsIgnoreCase("delete")) {
				cart.deleteMc(mcID);
			} else if (action.equalsIgnoreCase("update")) {
				cart.updateMc(mcID, newCount);
			}
		}
		if (action.equalsIgnoreCase("clear")) {
			cart.clearAllMc();
		} 
		RequestDispatcher rd = request
				.getRequestDispatcher("/font/cartManager.jsp");
		rd.forward(request, response);

	}
}