cart_modify.jsp

采用TOMCAT+SQL编程

<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="java.util.Vector"%>
<%@ page import="beans.bookelement"%>
<%Vector cart=(Vector)session.getAttribute("cart");
  Vector newcart=new Vector();
  for(int i=0;i<cart.size();i++){
    String number=request.getParameter("num"+i);
    if(number.equals("0")){
%>
<table width="100%">
<tr bgcolor="E0E0E0" valign="top"> 
  <td bgcolor="E0E0E0" align="center"><font size="2"><%out.println("数量不能为0");%></font></td>
</tr>
<tr bgcolor="E0E0E0" valign="top"> 
  <td bgcolor="E0E0E0"><div align="center">
        <input name="submit" type="button" value="确定" onClick="history.back(1);">
  </div></td>
</tr>
</table>
<%return;}
if(number.equals("")){%>
<table width="100%">
<tr bgcolor="E0E0E0" valign="top"> 
  <td bgcolor="E0E0E0" align="center"><font size="2"><%out.println("数量不能为空");%></font></td>
</tr>
<tr bgcolor="E0E0E0" valign="top"> 
  <td bgcolor="E0E0E0"><div align="center">
        <input name="submit" type="button" value="确定" onClick="history.back(1);">
  </div></td>
</tr>
</table>
<%return;}
bookelement mybookelement=(bookelement)cart.elementAt(i);
  String num=request.getParameter("num"+i);
  int newnum=Integer.parseInt(num);
  mybookelement.number=newnum;
  if(newnum!=0){
      newcart.addElement(mybookelement);}}
  session.setAttribute("cart",newcart);
  response.sendRedirect("cart.jsp");
%>