📄 cart_add.jsp
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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"%>
<jsp:useBean id="conndb" scope="page" class="beans.connDB"/>
<jsp:useBean id="chstr" scope="page" class="beans.chStr"/>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<%String bookid=chstr.chStr(request.getParameter("bookid"));
String sql="select * from bookdata where bookid='"+bookid+"'";
ResultSet rs=conndb.executeQuery(sql);
float price=0;
if(rs.next()){price=rs.getFloat("price");}
bookelement mybookelement=new bookelement();
mybookelement.bookid=bookid;
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<cart.size();i++){
bookelement bookitem=(bookelement)cart.elementAt(i);
if(bookitem.bookid.equals(mybookelement.bookid))
{bookitem.number++;
cart.setElementAt(bookitem,i);
Flag=false;
}
}}
if(Flag)cart.addElement(mybookelement);
session.setAttribute("cart",cart);
rs.close();
response.sendRedirect("cart.jsp");
%>
</body>
</html>
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