//shop_cart.jsp ＜%@ page contentType="text/html;charset=gb2312"%＞ ＜%@ page session="true" %＞ ＜%@ page language="java" import="java.sql.*" %＞ ＜jsp:useBean id="bka" scope="page" class="shop.bka" /＞ ＜% String product_type; String action; int product_id; int curpage; //商品类型 if (request.getParameter("