");
out.println( "");
out.flush( );
out.close( );
} // end of try
catch (Exception e)
{
System.out.println("Exception has occurred see stack trace below");
e.printStackTrace();
} // end of catch
} // end of doGet
public void doPost (HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
doGet (request, response);
} // end of doPost
public void doView(HttpSession session, PrintWriter out)
{
Map myOrders = null;
if (session.isNew() )
{
out.println("
Sorry there is no item in your cart
");
} // end of new session
else
{
myOrders = (Map) session.getAttribute("cart");
if (myOrders == null)
{
out.println("
Sorry there is no item in your cart
");
}
else
{
doDisplayCart(session, out);
}
} // end of not new session
} // end of doView
public void doAdd(HttpSession session, PrintWriter out, HttpServletRequest req)
{
Map myOrders = null;
String title = null;
String author = null;
String isbn = null;
double cost = 0;
int qty= 0;
if (session.isNew() )
{
myOrders = new HashMap();
} // end of newSession
else
{
myOrders = (Map) session.getAttribute("cart");
if (myOrders == null )
{
myOrders = new HashMap();
} // end of myOrders is null
}
Book b = new Book();
title = req.getParameter( "title" );
author = req.getParameter( "author" );
isbn = req.getParameter( "isbn" );
// need to validate the numeric qty come in
try
{
qty = Integer.parseInt(req.getParameter( "qty" ));
}
catch (NumberFormatException e)
{
qty = 1;
out.println("
Your quantity has been changed to 1. If you need more than 1, please make any correction you need ....
");
} // end of catch
cost = Double.parseDouble(req.getParameter( "cost"));
//create an instance of a book and assign it values
//retrieved from the form
b.setTitle(title);
b.setAuthor(author);
b.setISBN(isbn);
b.setCost(cost);
b.setQty(qty);
myOrders.put(isbn, b);
session.setAttribute("cart", myOrders);
doDisplayCart(session, out);
} // end of doAdd
public void doDelete(HttpSession session, PrintWriter out, HttpServletRequest req)
{
String isbn = null;
Map myOrders = (Map) session.getAttribute("cart");
isbn = req.getParameter( "isbn" );
// remove from the List
myOrders.remove(isbn);
if (myOrders == null)
{
out.println("
Your Cart is empty....
");
}
else
{
doDisplayCart(session, out);
}
} // end of doDelete
public void doDisplayCart (HttpSession session, PrintWriter out)
{
Map myOrders = (Map) session.getAttribute("cart");
Collection collect = myOrders.values();
Iterator it = collect.iterator();
int count = 0;
while (it.hasNext())
{
if (count == 0)
{
out.println( "
");
out.println( "
");
out.println( "
Title
");
out.println( "
Author
");
out.println( "
ISBN
");
out.println( "
Price
");
out.println( "
Quantity
");
out.println( "
Shopping Cart
");
out.println( "
");
} // end of printheading
Book temp = (Book)it.next();
out.println("
" + temp.getTitle() + "
" + temp.getAuthor() + "
" + temp.getISBN() + "
" + temp.getCost() + "
" + temp.getQty() + "
");
out.println("
");
count ++;
} //end of while loop
if (count == 0 )
{
out.println("
Your cart is empty....
");
}
} // end of doDisplayCart
} // end of ShoppingCartItem