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difference between Model 1 and Model 2

 
Greenhorn
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Hi,
can anybody briefly explain me about model 1 and model 2.

i think model 2 is mvc architecture.

then what about model 1 ?? is it just servlets,jsps???
 
Ranch Hand
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You're right. Model 2 is essentially MVC.

Here is a link that explains it. I've included the essential part in the quote below, but the whole article is good reading.

The literature on Web-tier technology in the J2EE platform frequently uses the terms "Model 1" and "Model 2" without explanation. This terminology stems from early drafts of the JSP specification, which described two basic usage patterns for JSP pages. While the terms have disappeared from the specification document, they remain in common use. Model 1 and Model 2 simply refer to the absence or presence (respectively) of a controller servlet that dispatches requests from the client tier and selects views.

A Model 1 architecture consists of a Web browser directly accessing Web-tier JSP pages. The JSP pages access Web-tier JavaBeans that represent the application model, and the next view to display (JSP page, servlet, HTML page, and so on) is determined either by hyperlinks selected in the source document or by request parameters. A Model 1 application control is decentralized, because the current page being displayed determines the next page to display. In addition, each JSP page or servlet processes its own inputs (parameters from GET or POST). In some Model 1 architectures, choosing the next page to display occurs in scriptlet code, but this usage is considered poor form. (See the design guideline Section 4.2.6.8 on page 89.)

A Model 2 architecture introduces a controller servlet between the browser and the JSP pages or servlet content being delivered. The controller centralizes the logic for dispatching requests to the next view based on the request URL, input parameters, and application state. The controller also handles view selection, which decouples JSP pages and servlets from one another. Model 2 applications are easier to maintain and extend, because views do not refer to each other directly. The Model 2 controller servlet provides a single point of control for security and logging, and often encapsulates incoming data into a form usable by the back-end MVC model. For these reasons, the Model 2 architecture is recommended for most interactive applications.

 
Ranch Hand
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Hi

In model1 we write all the view content and the business logic in same JSP only , but it will create a lots of problem as the size of project increases.

But in MVC we differentiate each and everything like model , view and controller , so it is very easy to manage all the stuff.
 
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thanks for the help
 
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