clearcart.java

基于MVC架构实现的购物车功能

package com.lyh.web;

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

import javax.servlet.http.HttpSession;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ClearCart 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 {

		response.setContentType("text/html;charset=GBK");
		PrintWriter out = response.getWriter();
		HttpSession session=request.getSession(true);
		if(session!=null)
		{
		Map cart=(Map)session.getAttribute("cart");
		if(cart.size()!=0&&cart!=null)
		{
			cart.clear();
			
		}
		}
		RequestDispatcher dispatcher=request.getRequestDispatcher("/ch05/shopCart.jsp");
		dispatcher.forward(request, response);
		
	}

}