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Example text

A common business rule is a validation, in which user input is checked against rules established to ensure that the input is legal. Validations are a classic why because the business domain determines the rules enforced by the validations. Even criteria such as a phone number format (Where do the parentheses go? ) are examples of business rules. ” are also examples of business rules. Only the people for whom the application is written can determine the business rules. This role is typically filled by a business analyst but can certainly be filled in a less formal way.

The catalog servlet passes only the item ID and quantity, so the addItemToCart() method must use that to build up all the information about an item in the cart. It returns success or failure, which is acted on by the servlet. Next, the servlet calls the helper method outputCheckoutForm() to generate the HTML that appears at the bottom to accept payment information. This method is simply a series of HTML generation lines. Finally, the servlet adds the updated cart back to the session and generates the footer.

This code must appear at the top of the HTML document generated by this servlet. 4). println(""); return out; } This method creates a print writer object (which it returns) and uses it to create the standard HTML elements for the top of the page. This method does not appear in the Catalog servlet. It appears instead in a base class servlet named EMotherServletBase. As with any application, common tasks exist that every servlet must perform. For example, every servlet in this application must get a reference to the connection pool and generate headers and footers for the HTML document.

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