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cart_modify.jsp
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26 lines (26 loc) · 960 Bytes
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<%@ 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")){
out.println("<script language='javascript'>alert('数量不能为0，请重新输入!');history.back();</script>");
return;
}
if(number.equals("")){
out.println("<script language='javascript'>alert('数量不能为空，请输入大于0的值!');history.back();</script>");
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_see.jsp");
%>