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Easy Learn Java: Programming Articles, Examples and Tips - Page 198


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I just started to write JSP and servlets code.

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Question: I just started to write JSP and servlets code. I read general recommendations how to write a Java code to be readable by other programmers (Code Conventions for the Java Programming Language http://java.sun.com/docs/codeconv/).
But a JSP code is quite different from ordinary Java one... Could you guide me?

Answer: Yes, you are right. As JavaServer Pages (JSP) technology is becoming widely adopted in web-based applications, many JSP programmers and web developers embarking on developing and maintaining these applications face a dilemma like that of many Java programmers: "How do we structure JSP code that is easier to read, write and maintain consistently?"

In the article "Code Conventions for the JavaServer Pages Technology Version 1.x Language" (http://developer.java.sun.com/developer/technicalArticles/javaserverpages/code_convention/), you can find a set of standard conventions for writing JSP pages (versions 1.1 and 1.2) that should be followed on a typical software project using web components. The article draws on the Code Conventions for the Java Programming Language as a template to identify various important elements that should be addressed in a coding conventions specification (relevant to JSP technology). In particular, it addresses file names and organization, indentation, comments, directives, declarations, scriptlets, expressions, white space, naming conventions, and programming practices.


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Posted by jalex on Tuesday, April 20, 2004 (00:00:00) (4410 reads)

I design User Interface for server applications. Are there any libraries,

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Question: I design User Interface for server applications. Are there any libraries, APIs, rules should I use/follow to make the development easier and standardized?

Answer: Yes, the JavaServer Faces Technology!
JavaServer Faces technology simplifies building user interfaces for JavaServer applications. With the well-defined programming model that JavaServer Faces provides, developers of various skill levels can quickly and easily build web applications by: assembling reusable UI components in a page, connecting these components to an application data source, and wiring client-generated events to server-side event handlers. With the power of JavaServer Faces technology, these web applications handle all of the complexity of managing the user interface on the server, allowing the application developer to focus on application code.

JavaServer Faces technology includes:

A set of APIs for: representing UI components and managing their state, handling events and input validation, defining page navigation, and supporting internationalization and accessibility.

A JavaServer Pages (JSP) custom tag library for expressing a JavaServer Faces interface within a JSP page.
Designed to be flexible, JavaServer Faces technology leverages existing, standard UI and web-tier concepts without limiting developers to a particular mark-up language, protocol, or client device. The UI component classes included with JavaServer Faces technology encapsulate the component functionality, not the client-specific presentation, thus enabling JavaServer Faces UI components to be rendered to various client devices. By combining the UI component functionality with custom renderers, which define rendering attributes for a specific UI component, developers can construct custom tags targeted to a particular client device. As a convenience, JavaServer Faces technology provides a custom renderer and a JSP custom tag library for rendering to an HTML client, allowing developers of Java 2 Platform, Enterprise Edition (J2EE) applications to use JavaServer Faces technology in their applications.

Ease-of-use being the primary goal, the JavaServer Faces architecture clearly defines a separation between application logic and presentation while making it easy to connect the presentation layer to the application code. This design enables each member of a web application development team to focus on their piece of the development process, and provides a simple programming model to link the pieces together. For example, web page developers with no programming expertise can use JavaServer Faces UI component tags to link to application code from within a web page without writing any scripts.
This and more description is published on: http://java.sun.com/j2ee/javaserverfaces/


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80 comments | Printer Friendly Page  Send to a Friend | Score: 5
Posted by jalex on Friday, April 16, 2004 (00:00:00) (3377 reads)

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