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JavaServer Faces (JSF) is an application framework for creating Web-based user interfaces. If you are familiar with Struts (a popular open source JSP-based Web application framework) and Swing (the standard Java user interface framework for desktop applications), think of JavaServer Faces as a combination of those two frameworks. Like Struts, JSF provides Web application lifecycle management through a controller servlet; and like Swing, JSF provides a rich component model complete with event handling and component rendering.
In a nutshell, JSF eases Web-based application development because it:
- Lets you create user interfaces from a set of standard, reusable server-side components
- Provides a set of JSP tags to access those components
- Transparently saves state information and repopulates forms when they redisplay
- Provides a framework for implementing custom components
- Encapsulates event handling and component rendering so you can use standard JSF components or custom components to support markup languages other than HTML
- Lets tool vendors develop IDEs for a standard Web application framework
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