<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %> <%@ page import="java.util.Vector"%> <%@ page import="beans.bookelement"%> <% String ISBN=chStr.chStr(request.getParameter("ISBN")); String sql="select * from tb_bookinfo where ISBN='"+ISBN+"'"; ResultSet rs=connDB.executeQuery(sql); float price=0; if(rs.next()){ price=rs.getInt("price"); } bookelement mybookelement=new bookelement(); mybookelement.ISBN=ISBN; mybookelement.price=price; mybookelement.number=1; boolean Flag=true; Vector cart=(Vector)session.getAttribute("cart"); if(cart==null){ cart=new Vector(); }else{ for(int i=0;i