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  Tutorial: Creating JSF Custom Components

Creating JSF Custom Components This article illustrates how to build custom components for use in web applications based on JavaServer Faces (JSF). While JSF comes with a standard set of components, one of the most-publicized features is the easy additio

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Very Quick JSF Introduction
At a very high level, JSF is an implementation of the Model 2 pattern, also referred to as Model-View-Controller (MVC), for the Web. The basic idea behind the pattern is to separate the concerns of your application; namely, the business logic, the user interface that allows manipulation business data, and the glue that makes the two able to communicate. Another way to think about MVC is that you don't want to put the discount calculation into the View, because that calculation is business logic. Instead, keep all of the business logic together in coherent abstractions referred to as the Model. Then, keep the complexity of your user interface together in coherent abstractions referred to as the View. Finally have the model and view talk together with a layer of "glue" called the Controller.

Components in JSF are part of the View layer. The view is built by composing groups of components into trees that together make up the user interface. The components themselves are fairly fine-grained and are typically reusable from one user interface to another. An example would be the HtmlInputText component that is part of the JSF standard. This component provides a text field for users to type in data. A group of inputs is composed into a view, and that view allows for manipulation of a particular piece of business information through the controller that sits between the view and model objects being edited. You can find a lot more good information at the official JSF site.


 

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