updateshopcartservlet.java

电子商务系统： 项目描述：该系统主要完成用户网上购物、订单管理、产品管理、管理员管理等功能。后台管理员对产品类别和产品进行管理后

package com.tarena.shop.servlet;

import java.io.IOException;
import java.util.Iterator;
import java.util.Set;

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.tarena.shop.biz.Cart;
import com.tarena.shop.entity.Item;

public class UpdateShopCartServlet extends HttpServlet {
	public void doPost(HttpServletRequest req,HttpServletResponse resp)
	throws ServletException,IOException
	{
//		Integer[] count = (Integer[])req.getAttribute("count");
//		Integer[] del = (Integer[])req.getAttribute("del");
//		System.out.println("del="+del);
		String[] dd=(String[])req.getParameterValues("del");
		System.out.println("dd="+dd);
		HttpSession session=req.getSession();
		if(session==null){
			System.out.println("no session");
			System.exit(1);
		}
		Item item = new Item();
		Cart cart = (Cart)session.getAttribute("Cart");
		if(cart!=null){
			Set<Integer> pid=cart.getCartItem().keySet();
		
			System.out.println("size="+pid.size());
//			Iterator p = pid.iterator();
			Integer[] prid=new Integer[pid.size()];
			int i = 0;
			for(Integer id:pid){
				prid[i]=id;
				i++;
				}
			System.out.println("prid.length="+prid.length);
			for(int j =0 ;j<prid.length;j++){
				String iD = prid[j].toString();
				String num=(String)req.getParameter(iD);
				
					Integer number = null;
					try {
						number = Integer.decode(num);
					} catch (NumberFormatException e) {
						number=1;
					}
					System.out.println("num="+num+"id="+prid[j]+j);
					cart.modiftNumberByProductId(prid[j], number);
			System.out.println(prid[j]);
			}
//		while(p.hasNext())
//		{
//		 id=(Integer)p.next();
//		 String iD = id.toString();
//			String num=(String)req.getParameter(iD);
//			System.out.println("num="+num+"id="+id);
//				Integer number=Integer.decode(num);
//				cart.modiftNumberByProductId(id, number);//更新数量
//			}
		}
		if(dd!=null){
			for(int i=0;i<dd.length;i++)
			{
				Integer id = Integer.decode(dd[i]);
				cart.deleteItemByProductId(id);
			}
		}
		session.setAttribute("Cart", cart);
			
		resp.sendRedirect("basket.jsp");

	}		
}