Introduction to JSF 2.0

Today I have started JSF 2.0 after a long time I got some time to do something related to code.It seems JSF simpler if you know Struts 2.0 or Spring3.x .But JSF is more easier then Struts/Spring I would like to say.

Navigation in JSF is very impressive and very useful for security of your website as it does not show loaded/clicked action in URL.

I would be able to share my learning might be in some different part,Today I will going to give some introduction part on JSF ,also would like to share why we should go for JSF if we are having another framework like Struts and Spring etc.


Java Server Faces (JSF) is result of a quest for …
•Building dynamic web user interface in easy, efficient and maintainable way
•Building web applications based on well-designed architecture to make it most maintainable
•Now in its version 2.0 ,it is indeed a standard way of building java based web applications


I would like to define JSF in terms of below given bullet points-JSF (Java Server Faces)is 
•Is a Java EE Web application development framework
•Simplifies web application development, using existing markup and servlet technologies as its foundation
•Powerful, component-based UI
•Development framework that uses MVC2 design approach

Why Should we go for JSF can we define in terms of what JSF is offering us-


–Component-centric API
•To easily assemble Web application user interfaces
•Extensible for specialized behavior
–Tag libraries that enable operations on UI, by attaching
•Validations (including Bean Validations)
•Type conversion for input values
•Loading resource bundles
•All this for most simple to most complex container components
–Event-based Java Bean model way of interacting with application data as managed beans (XML/annotations)
–The Faces Request Processing Life Cycle
•Handles input standard/custom data-conversion/validation
•Update server-side application data
–Easy i18n of applications
–Flexible API that allows pluggable rendering technology
•Render HTML : A browser makes a request
•WML : PDA/ WAP-enabled browser makes a request
•iPhone-specific HTML : To serve content to an iPhone
–Unified Expression Language (JSP EL + JSF EL)
•Built-in Faceless/Advanced tinplating
•First-class support for Ajax
•Composite components
–Many more features ….


Like other web framework present in market today JSF 2 also follows MVC-2 architecture
  • Model- Managed Bean (i.e. UserBean pure POJO)
  • View- Faceless (XHTML)
  • Controller- Faces Servlet

MVC 2
                 
A very short example for a typical JSF-view would be the following:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:f="http://java.sun.com/jsf/core">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Insert title here</title>
</head>
<body>
  
        <f:view>
      <h:form id="mainForm">
     <h:outputLabel for="enterName" value="Enter Name"/>
     <h:inputText id="enterName" value="#{sayHelloPage.name}"/>
     <h:commandButton value="Say Hello" action="#{sayHelloPage.sayHello}"/>
     </h:form>
      </f:view>
    </body>
</html>

Note: To use <h:xx> and <f:xx> tags in code we are using  additional xmlns(xml name space) given below-
     For HTML tag in JSF     -    xmlns:h="http://java.sun.com/jsf/html"
     For JSF Core tag in JSF -   xmlns:f="http://java.sun.com/jsf/core"



To be Continued.... 

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