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Easy Learn Java: Programming Articles, Examples and Tips - Page 199


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Which JSP model (Model 1 or Model 2) and when should I use in my web applicatio

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Question: Which JSP model (Model 1 or Model 2) and when should I use in my web applications?

Answer: You should use Model 1 only for simple applications and when you want to get something done quickly.
The main problem with Model 1 is that it is hard to maintain and change (luck of flexibility).
Model 1 architecture is best when the page navigation is simple and fixed, and when a simple directory structure can represent the structure of the pages in the application. Such applications usually embed the page flow information in the links between the pages. The presence of forward in a JSP page implies that logic embedded in the page is making a decision about the next page to display.

Model 2 is recommended for medium- and large-sized applications or applications that will grow in complexity in the future.
Over time, as the application grows and changes, page flow logic accumulates. The application becomes difficult to maintain because the page flow logic is distributed across multiple pages. The best time to switch from Model 1 to Model 2 is before this maintenance problem arises. This is why it's usually best to choose Model 2 from the outset, basing the application on an existing Web controller framework that best meets application requirements. Model 1 remains a viable option for simple, static applications.


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8 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Tuesday, April 27, 2004 (00:00:00) (3848 reads)

How do I use JavaBeans components (beans) from a JSP page?

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Question: How do I use JavaBeans components (beans) from a JSP page?

Answer: The JSP specification includes standard tags for bean use and manipulation. The useBean tag creates an instance of a specific JavaBeans class. If the instance already exists, it is retrieved. Otherwise, it is created. The setProperty and getProperty tags let you manipulate properties of the given object. These tags are described in more detail in the JSP specification and tutorial.
tip is from the JSP FAQ: http://java.sun.com/products/jsp/faq.html


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19 comments | Printer Friendly Page  Send to a Friend | Score: 2.5
Posted by jalex on Wednesday, April 21, 2004 (00:00:00) (3516 reads)

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