showshoppingcart.java

一个经典购物车（shoppingcart）实例代码

package com.jpioneer.application.shoppingcart.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

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.jpioneer.application.shoppingcart.service.ShoppingCartService;
import com.jpioneer.application.shoppingcart.service.impl.ShoppingCartServiceImpl;

public class ShowShoppingCart extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public ShowShoppingCart() {
		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();
       ShoppingCartService service= (ShoppingCartServiceImpl)session.getAttribute("shoppingCart");
       try{
         List list=(List)service.getAllCarts();
         request.setAttribute("list",list);
         request.getRequestDispatcher("/com/jpioneer/jsp/shopping/showShoppingCart.jsp").forward(request,response);
       }catch(Exception e){
    	   e.printStackTrace();
       }
	}

	/**
	 * 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
	}

}