Add Items in Shopping Cart

[witchblade]

Does anyone have a good example of how I should go about adding up items in a shopping cart that I built? I am at the last point in my project, and I just can't get it to work.

Also, I am using Sessions in the project, and heard that I should not use Cookies if I am using Session?????

 

[Bygbobbo]

I would recommend creating a Vector as a session variable and appending a new Order line items(OLI) to that vector when a non unique OLI is chosen by the client. This would allow you the ability to iterate through a shopping cart nicely. The API is very descriptive on how to use vectors:

HttpSession session = req.getSession(true);//creates session if it doesnt exist already
session.putValue("ShopCart", new Vector());//creates vector

//if OLI doesnt exist, check by looping through the Vector
make sure you type cast the element with the object class..
then;

OLI addMe = new OLI (productName, OEM, cost, quantity, shippingCost);
ShopCartHere.addElement(addMe);

// looping through the vector can be done to iterate or to see if an OLI already exists

for (int i = 0; i < ShopCartHere.size(); i++){
OLI A = (OLI) ShopCartHere.elementAt(i);
String OEM = req.getParameter(&quot;OEM&quot;
if (A.getOEM().equals(OEM)){
String Tquantity = req.getParameter(&quot;quantity&quot;
int quantity = Integer.parseInt(Tquantity);
A.updateQuantity(quantity);
} //end if statement
}//end loop

You can make another function which will delete a Vector element by passing the element number:
// delete is an interger
ShopCartHere.removeElementAt(delete);

this should get you started.

As for your other question I would stick with either client side sessions or server side session IDs. Too many people have cookies turned off..

Bygs