clientdecreaseonecommodityaction.java

电子商务网站使用MVC模式B/S结构功能不是很全适合初学者看

package Client;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import Common.DBConnectBean;

public class clientDecreaseOneCommodityAction extends HttpServlet{
	public void doGet(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException{
		ServletContext application=getServletConfig().getServletContext(); 
		request.setCharacterEncoding("gb2312");
		HttpSession session=request.getSession();
		String username=(String)session.getAttribute("username");
		////////////////////System.out.println("这个没打印");
		if(username==null){
			application.getRequestDispatcher("/client/clientList.jsp?logged=false").forward(request,response);	
		}
		
		ArrayList commodityList=new ArrayList();
		Hashtable commodity=new Hashtable();
		String commodityID=request.getParameter("id");
		if (commodityID==null) System.out.print("   wakao zmshehihih");
		if(commodityID!=null){
			DBConnectBean dbBean=new DBConnectBean("sun.jdbc.odbc.JdbcOdbcDriver","jdbc:odbc:shopping","","");
			
			if(session.getAttribute("commodityList".toUpperCase())!=null){
				//获取现在客户的购物车里的所有商品的信息及数量
				commodityList=(ArrayList)session.getAttribute("commodityList".toUpperCase());
			}
			System.out.println("the client now has buy ");
			//如果客户已经买了该商品，则添加商品数量
			if(commodityList!=null){
				System.out.println("不空不空");
				for(int j=0;j<commodityList.size();j++){
					Hashtable tb=(Hashtable)commodityList.get(j);
					String id=tb.get("id".toUpperCase()).toString();
					System.out.print("------finding   "+id+commodityID);
					if(id.equals(commodityID)){
						System.out.println("found  ");
						commodity=tb;
						commodityList.remove(j);
						int number=Integer.parseInt(tb.get("number".toUpperCase()).toString())-1;
						commodity.put("number".toUpperCase(),number);
						commodityList.add(j,commodity);
						System.out.println("find one has bought");
						session.setAttribute("commodityList".toUpperCase(),commodityList);	
						break;
					}
				}
			}
		}
		application.getRequestDispatcher("/client/clientShopCar.jsp").forward(request,response);
	}
	public void doPost(HttpServletRequest request,HttpServletResponse response)throws IOException,ServletException{
	   	doGet(request,response);
	}
}