buyservlet.java

一个ssh的网上购物系统

package com.xfaccp.bookonline.hib.util;

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

public class BuyServlet extends HttpServlet {

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

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

//		获取商品编号：
		request.setCharacterEncoding("gb2312");
		HttpSession session=request.getSession();
		//获取书本的编号
		int id=Integer.parseInt(request.getParameter("bookid"));
		if(session.getAttribute("cart")==null)
		{
			//创建个HashMap对象
			HashMap map=new HashMap();
			//第一个时
			map.put(new Integer(id),"1");
			session.setAttribute("cart",map);
		}
		else
		{
			HashMap	map=(HashMap)session.getAttribute("cart");
			if(map.containsKey(new Integer(id))==true)
			{
				//如果有这样的键(获取数量count)
				int count=Integer.parseInt(map.get(new Integer(id)).toString());
				count++;
				map.put(new Integer(id),new Integer(count));
				session.setAttribute("cart",map);
			}
			else
			{
				//如果没有这样的键
				map.put(new Integer(id),"1");
				session.setAttribute("cart",map);
			}
		}
		//获取此商品的相关信息：
		//把此商品的信息放入集合vectorBuy里：
		//把集合vectorBuy放到session里面：
		//转到购物车页面：
	}

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

}