Jsf presentation

Java Server Faces (JSF)
Brief Introduction and Market Trends

Created by :Ashish Gupta

Instruction Guide Contents

MVC 3

Request Based & Component Based Frameworks 4

Introduction to JSF 5

Lifecycle of JSF 7

JSF Components 9

Introduction to Facelets 15

Difference between JSF and JSF 2 16

Comparison of Top 3 MVC 17

Google Trends 18

Market Trends 19

What is MVC ?

The model-view-controller (MVC) architecture provides a set of design patterns that
help you separate the areas of concern involved in building and running a GUI or Web
based application:

MODEL
 encapsulates the business logic and persistence code for the application.
 It should be as view-technology-agnostic as possible.
 For example, the same model should be usable with a Swing application, a Struts app,
or a JSF app.

VIEW
 should display model objects and contain presentation logic only.
 There should be no business logic or controller logic in the view.

CONTROLLER
 acts as the mediator between the view and the model.
 The controller talks to the model and delivers model objects to the view to display.
 In an MVC architecture the controller always selects the next view.

.

Diff. between Request and Component Based Frameworks
Request based framework is basically a web framework that gets user's request then determine what
the system should do and give back the response back to the user. Example are Struts 2, Grails
 Flow is linear
 Intimately tied to the HTTP request cycle and request format.
Provide only basic API extensions and services – like simple page navigation, data entry validation
and mapping.
Explicit coding by developer for every request
Action Framework is work better in stateless environments
Scenario  If you're going to do a "web site", where URLs are important, lots of read only, higher
loads of simpler traffic, etc.

Component based framework We think in component and define components and tell what it does.
They attempt to abstract this away and treat the application as collections of components with renderers
and actions to do things. Examples are JSF, Wicket

Has no clear sense of the flow from front to back thus non-linear
It tends to hide the underlying HTTP request and use its own, higher level abstraction.
Typically have a lot of session state associated with them.
They operate on the higher level of abstraction and allow you to build user interface from ready-made
UI components.
Favorable for people who don’t have much experience in advanced HTML, CSS ,vanilla JS and JS
libraries,
Scenario  If its a back office application, lots of CRUD screens, not as many users, complicated page
and workflows, lots of page component interaction

Introduction to JSF

JavaServer Faces (JSF) is the well-established standard for web-development
frameworks in Java.
A component based MVC framework which is built on top of Servlet API
Providing components in the type of taglibs which can be used in JSP or Facelets.
(Both are view technologies)

A typical JSF application consists of the following parts:
Event-driven development (via listeners as in traditional GUI development).
Pages that represent MVC-style views and set of tags to add components to the web
pages.
A set of managed beans (POJOs) They support services, such as resource injection,
lifecycle callbacks and interceptors.
Optionally, one or more application configuration resource files, such as a faces-
config.xml file, which can be used to define page navigation rules and configure beans
and other custom objects, such as custom components.
A set of custom objects, which can include custom components, validators, converters,
or listeners, created by developers.

Introduction to JSF (cont.)

FacesServlet is the sole request-response Controller.
It takes all the standard and tedious HTTP request/response work such as 
 Gathering user input and Validating/converting them
 Putting inputs in model objects
 Invoking actions and rendering the response.

JSF provides the following development advantages:

Clean separation of behavior and presentation.
Component-level control over statefulness
Events easily tied to server-side code
Leverages familiar UI-component and Web-tier concepts
Offers multiple, standardized vendor implementations
JSF's fine-tuned event model allows your applications to be less tied to HTTP details
and simplifies your development effort.
Reuse and extend components through customization.

Lifecycle of JSF (contd.)
Restore component tree
 The controller examines the request and extracts the view ID, determined by the name
of the JSP
If the view doesn't already exist, the JSF controller creates it otherwise creates it.
The view contains all the GUI components.
Apply Request Values
The purpose of this phase is for each component to retrieve its current state.
Component values are typically retrieved from the request parameters.
Process Validations
At this stage, each component will have its values validated against the application's
validation rules.
Update Model
Updates the actual values of the server-side model --namely, by updating the properties
of your backing beans.
Invoke Application
The JSF controller invokes the application to handle Form submissions.
The component values will have been converted, validated, and applied to the model
objects, so you can now use them to execute the application's business logic.
Render Response
You display the view with all of its components in their current state. Basically, render
page & send it back to client

JSF Components

JSF UI Components 
UI Input UI Output UI SelectBoolean
UI SelectMany
UI SelectOne UI SelectMany UI Graphic UI
Command UI Form
JSF HTML Tag Library 
JSF Core Tag Library ( Validator, Event Listeners
and Converters)
JSF Standard Library (Express UI Components)
JSF Managed Beans 
Use to separate presentation from business logic
Based on JavaBeans and use the declarative model
Entry point into the model and event handlers
JSF Value Binding  Bind component value and
attribute to model objects
Literal:
<h:outputText rendered=”true”
value=”$1000.00”/>
Value Binding:
<h:outputText rendered=”#{user.manager}”
value=”#{employee.salary}”/>

JSF Value binding expression can accept
Bean properties
List
Array
Map
Predefine objects-header, header values, request parameters, cookie,
request/session/application scope attributes, initial parameters

JSF Method Binding --> Binding an event handler to a method

<h:commandButton action=“#{user.login}”/>

Four component attributes:
Action
Action listener
Value change listener
Validator
JSF Events are fired by each UI component. Event handlers are registered with each
component

Value Changed Listener:
<h:inputTextid=”maxUsers”valueChangeListener=“#{user.checkMaxUser}”/>
public void checkMaxUser(ValueChangeEventevt) {
evt.getNewValue(); // new value
evt.getOldValue(); // old value
}
Action Listener:
<h:commandButtonvalue="Login“actionListener=“#{customer.loginActionLis
tener}”
action=“#{customer.login}”/>
public void loginActionListener(ActionEvente) {
}
public String login() {
return “OK”;
}
Listener Handlers
a) Implement UI logic b) Have access to event source c) Do not participate in
navigation handling
Action Handlers
a) Implement business logic b) Don’t have access to action source c) Returned
outcome affects the navigation handling.

JSF Validators
For validating user input
0 or more validators can be registered with a UI Input component
Validators are invoked during the Process Validation srequest processing phase.
Standard validators and custom validator are present.

Required Validation Example
<h:inputTextvalue=“#{user.id}”required=“true”/>
Length Validation Example
<h:inputTextvalue=“#{user.password}”>
<f:validateLengthminimum=“6”/>
<f:validatorvalidatorId=“passwordValidator”/>
</h:inputText>
JSF Converters Type conversion between server-side objects and their representation in
markup language. e.g. DateTime and Number.
Number converter example:
<h:inputTextvalue=“#{rent.amt}”converter=“Number”>
<f:attributename=“numberStyle”value=“currency”/>
</h:inputText>
Date convert example:
<h:inputTextvalue=“#{rent.dueDate}”converter=“DateFormat”>
<f:attributename=“formatPattern”value=“MM/DD”/>
</h:inputText>

JSF Error Handling contains summary and detail (Information, Warning, Error, Fatal)
<h:messages> - to display all messages
<h:message> - to display a single message for a particular component

JSF HTML & CSS Integration 
Pass-through attributes <h:inputTextsize=“5”onblur=“checkValue();”/>
StylesheetsIntegration <h:outputTextstyleClass=“header”value=“#{bundle.welcome}”/>

JSF Navigation
A default navigational handler . Behavior is configured in configuration file (faces-
config.xml).

<navigation-rule>
<description>LOGIN PAGE NAVIGATION HANDLING</description>
<from-view-id> /login.jsp</from-view-id>
<navigation-case>
<description>Handle case where login
succeeded.</description>
<display-name>Successful Login</display-name>
<from-action>#{userBean.login}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/home.jsp</to-view-id>
</navigation-case>
<navigation-case>
<description>Registration fornew user
succeeded.</description>
<display-name>Successful New User
Registration</display-name>
<from-action>#{userBean.register}</from-action>
<from-outcome>success</from-outcome>
<to-view-id>/welcome.jsp</to-view-id>
</navigation-case>
</navigation-rule>

JSF HTML Tag Library

<f:view>
<h:form id=”logonForm”>
<h:panelGrid columns=”2”>
<h:outputLabel for=”username”>
<h:outputLext value=”Username:”/>
</h:outputLabel>
<h:inputText id=”username” value=”#{logonBean.username}”/>
<h:outputLabel for=”password”>
<h:outputText value=”Password:”/>
</h:outputLabel>
<h:inputSecret id=”password”
value=”#{logonBean.password}”/>
<h:commandButton id=”submitButton”type=”SUBMIT”
action=”#{logonBean.logon}”/>
<h:commandButton id=”resetButton” type=”RESET”/>
</h:panelGrid>
</h:form>
</f:view>

Introduction to Facelets

Facelets is an open source XML-based view technology designed specifically for JSF
Advantages
Provides great templating capabilities such as composite components whereas JSP provides
include directive only.
 Default view handler technology for JSF 2.
 Faster compilation time and High-performance rendering then JSP
 Compile-time EL validation
 Support for code reuse through templating and composite components.

Tag Library Prefix Example URI Contents

JavaServer Faces Facelets ui:component
ui: http://java.sun.com/jsf/facelet Tags for templating
Tag Library ui:insert
s
h:head
JavaServer Faces HTML Tag h:body JavaServer Faces component tags for all
h: http://java.sun.com/jsf/html
Library h:outputText UIComponentobjects
h:inputText
Tags for JavaServer Faces custom
JavaServer Faces Core Tag f:actionListener
f: http://java.sun.com/jsf/core actions that are independent of any
Library f:attribute
particular render kit

Difference between JSF2 and JSF

JSP is replaced by Facelets as the default view technology.
Facelets was expanded with capabilities to create custom components using pure XML
(the so-called composite components).
Ajaxical powers were introduced in flavor of the <f:ajax> component and like which
has much similarities with Ajax4jsf. With JSF 2.0, more nice-looking component
libraries were born, among others PrimeFaces andOpenFaces.
Annotations and convention-over-configuration enhancements were introduced to kill
the verbose faces-config.xml file as much as possible.
The ID separator character : became configurable.
A new scope was introduced, the view scope. This scope will live as long as you're
subsequently submitting and navigating to the same view (independently of the opened
browser tab/window), either synchronously or asynchronously.

Difference between JSF Implementations and JSF Components

JSF implementations implements the JSF API Specification. They contains at least
the standard components to display any of the available basic HTML elements. There are
two (major) JSF implementations, namely Oracle Mojarra and Apache MyFaces.
JSF component libraries adds extra on top of the basic implementation, often with
more skinnability, ajaxability, enhanceability, etc. There are lot of them like
PrimeFaces, RichFaces, IceFaces.

Comparison on Top 3 Industry MVC (1 being good and 3 being bad)

Criteria/Framework JSF STRUTS 2 SPRING MVC

LEARNING CURVE 3 1 2

PROJECT HEALTH 2 3 1

DOCUMENTATION 1 3 1

JOB TRENDS 1 1 1

AJAX SUPPORT ICE FACES / IN-BUILT DOJO/JQUERY PLUGIN 3RD PARTY

BOOKMARKING AND URL POST (NOT POSSIBLE) USES NAMESPACES (EASY) FULL URL CONTROL

OGNL EXPRESSION BUT NEED
VALIDATION EASY TO CONFIGURE COMMONS VALIDATOR
CONF FOR CLIENT SIDE

ALLOWS TO ADD PARAMS TO
POST & REDIRECT REQUIRES CUSTOM SOLN REQUIRES CUSTOM SOLN
REDIRECT

DEMAND MEDIUM LOWEST HIGHEST

PLUGINS HIGHEST MEDIUM LOWEST

DEVELOPERS AVAILABLE MEDIUM LOWEST HIGHEST

REST SUPPORT LOWEST MEDIUM HIGHEST

TAGGED QUESTION/SUPPORT MEDIUM LOWEST HIGHEST

Google Trends

Last 12 months with Spring MVC

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