The Java EE 5 Tutorial (PDF) - Oracle Software Downloads

}
double sale = book.getPrice() * .85;
Float salePrice = new Float(sale);
book.setPrice(salePrice.floatValue());
}
cart.add(bookId, book);
} catch (BookNotFoundException ex) {
// not possible
}
}
} else if (selectedScreen.equals("/bookshowcart")) {
bookId =request.getParameter("Remove");
if (bookId != null) {
cart.remove(bookId);
}
clear = request.getParameter("Clear");
if (clear != null && clear.equals("clear")) {
cart.clear();
}
} else if (selectedScreen.equals("/bookreceipt")) {
// Update the inventory
try {
utx.begin();
bookDBAO.buyBooks(cart);
utx.commit();
} catch (Exception ex) {
try {
utx.rollback();
request.getRequestDispatcher(
"/bookordererror.jsp").
forward(request, response);
} catch(Exception e) {
System.out.println(
"Rollback failed: "+e.getMessage());
e.printStackTrace();
}
}
}
try {
request.
getRequestDispatcher(
"/template/template.jsp").
forward(request, response);
} catch(Exception ex) {
ex.printStackTrace();
}
public void doPost(HttpServletRequest request,
Programming SimpleTag Handlers
Chapter 8 • CustomTags in JSP Pages 267