Java server faces

Introduction to
Java Server Faces(JSF)
Deepak Goyal
Vikas Varma
Sun Microsystems

2
Objective
Understand the basic concepts of
Java Server™ Faces[JSF]
Technology.

 What is and why JSF?
 Architecture Overview
 UI Component Model
 Development Steps
Agenda

4
JavaServer™ Faces (JSF)
Framework Is…
A server side user interface
component framework for Java™
technology-based web applications

5
What is JSF?
● A specification and reference
implementation for a web application
development framework
– Components
– Events
– Validators & converters
– Navigation
– Back-end-data integration

6
Why JSF? (page 1)
● MVC for web applications
● Clean separation of roles
● Easy to use
● Extendable Component and Rendering
architecture
● Support for client device independence
● Standard
● Huge vendor and industry support

7
Why JSF? (page 2)
● JSP and Servlet
– No built-in UI component model
● Struts (I am not saying you should not use Struts)
– No built-in UI component model
– No built-in event model for UI components
– No built-in state management for UI components
– No built-in support of multiple renderers
– Not a standard (despite its popularity)
● Struts and JSF can be used together

8
How the JSF Specification Fits In
JSF App
Servlets (2.3)
JSP (1.2) JSF API
JSF Tags
JSF App

10
JSF Architecture [MVC]
HTML
RenderKit
App
Backend
Desktop
Browser
Phone
Front
ctrl
JSF Page
JSF Page
WML
HTML
Server
WML
RenderKit

Request processing Lifecycle
FacesServlet
FacesContext
1.Creates FacesContext
Lifecycle
2.Passes controls to Lifecycle
3. Process FacesContext in various phase

12
Request Processing Lifecycle Phases
Faces
Request Reconstitute
Component
Tree
Apply
Request
Values
Process
Validations
Faces
Response Render
Response
Invoke
Application
Update
Model
Values

13
Request Processing Lifecycle
Faces
Request Reconstitute
Component
Tree
Apply
Request
Values
Process
Events
Process
Validations
Process
Events
Response
Complete
Response
Complete
Render Response
Response
Complete
Response
Complete
Faces
Response Render
Responder
Invoke
Application
Update
Model
Values
Process
Events
Process
Events
Conversion Errors /
Render Response
Validation / Conversion
Errors / Render Response

14
Request Processing Lifecycle
Phases
1.Reconstitute component tree phase
2.Apply request values phase
3.Process validations phase
4.Update model values phase
5.Invoke application phase
6.Render response phase

16
User Interface Component Model
● UI components
● Event handling model
● Conversion and Validation model
● Rendering model
● Page navigation support

UI Components
 UIComponent/UIComponentBase
 Base class for all user interface components
 Standard UIComponent Subclasses
 UICommand, UIForm, UIOutput
 UIGraphic, UIInput, UIPanel, UIParameter
 UISelectBoolean, UISelectMany, UISelectOne
 Example:
<h:inputText id="userNo"
value="#{UserNumberBean.userNumber}"/>

Validators and Converters
 Validators—Perform correctness checks on
UIInput values
 Register one or more per component
 Enqueue one or more messages on errors
 Standard implementations for common cases
 Converters—Plug-in for conversions:
 Output: Object to String
 Input: String to Object
 Standard implementations for common cases

Converters and Validators
Example:
Converters:
<h:input_text valueRef=”testingBean.today”
convertor=”DateTime”/>
Validators:
<h:input_text valueRef=”testingBean.today”
<f:validator_length minimum=”6” maximum='10” />

Rendering Model
 Renderers-Adapt components to a specific markup
language
 Decoding
 Encoding
 RenderKits—Library of Renderers
 Map component classes to component tags
 Is a custom tag library
 Basic HTML RenderKit

Events and Listeners
 Follows JavaBeans™ Specification design and
naming patterns
 Standard events and listeners
 ActionEvent—UICommand component activated
by the user
 ValueChangedEvent—UIInput component whose
value was just changed

Navigation Model
 Application developer responsibility
 Defined in Application configuration file
(Facesconfig.xml)
 Navigation rules
 Determine which page to go.
 Navigation case

Navigation Model
<navigation-rule>
<from-tree-id>/login.jsp</from-tree-id>
<navigation-case>
<from-outcome>success</from-outcome>
<to-tree-id>/menu.jsp</to-tree-id>
</navigation-case>
<navigation-case>
<from-outcome>failed</from-outcome>
<to-tree-id>/error.jsp</to-tree-id>
</navigation-case>
</navigation-rule>

Steps in Development Process
1. Develop model objects which hold the data
2. Add model objects (managed bean) declarations to
Application Configuration File faces-config.xml
3. Create Pages using UI component and core tags
4. Define Page Navigation in faces-config.xml
5. Configure web.xml

Step1: Develop model Objects
(Managed Bean)
 The model (M) in MVC
 A regular JavaBeans with read/write properties
 May contain application methods and event handlers
 Use to hold data from a UI (page)
 Creation and lifetime is managed by JSF runtime
 application, session, request
 JSF keeps the bean's data in sync with the UI

Step 2. Managed Bean Declaration
(Faces-config.xml)
01 <managed-bean>
02 <managed-bean-name>
03 LoginFormBean
04 </managed-bean-name>
05 <managed-bean-class>
06 myapp.LoginFormBean
07 </managed-bean-class>
08 <managed-bean-scope>
09 request
10 </managed-bean-scope>
11 </managed-bean>

Step 3: Create JSF Pages
 Must include JSF tag library
 HTML and core tags
 All JSF tags must enclosed between a set of view tag
 Use JSF form and form component tags
 <h:input_text> not <input type=”text”>
 <h:command_button> not <input type=”submit”>
 May include validators and event listeners on any form
components

Sample JSF™ Page (login.jsp)
01 <f:view>
02 <f:form formName=”logonForm”>
03 <h:panel_grid columns=”2”>
04 <h:output_text value=”Username:”/>
05 <h:input_text id=”username” length=”16”
06 valueRef=”logonBean.username”/>
07 <h:output_text value=”Password:”/>
08 <h:input_secret id=”password” length=”16”
09 valueRef=”logonBean.password”/>
10 <h:command_button type=”submit”
11 label=”Log On”
12 actionRef=”logonBean.logon”/>
13 <h:command_button type=”reset”
14 label=”Reset”/>
15 </h:panel_grid>
16 </f:form>
17 </f:view>

Binding UI to Managed Bean
<h:input_text id=”userName”
valueRef=”LoginFormBean.userName”/>
<managed-bean>
<managed-bean-name>
LoginFormBean
</managed-bean-name>
<managed-bean-class>
myapp.LoginFormBean
</managed-bean-class>
public class LoginFormBean
...
public void
setUserName(...) {
public String
getUserName(...) {
faces-config.xml
login.jsp
LoginFormBean.java

Step 4: Define Page Navigation Rules
(Faces-config.xml)
01 <navigation-rule>
02 <from-tree-id>/login.jsp</from-tree-id>
03 <navigation-case>
04 <from-outcome>success</from-outcome>
05 <to-tree-id>/menu.jsp</to-tree-id>
06 </navigation-case>
07 </navigation-rule>
08
09 <navigation-rule>
010 <from-tree-id>/login.jsp</from-tree-id>
011 <navigation-case>
012 <from-outcome>failure</from-outcome>
013 <to-tree-id>/error.jsp</to-tree-id>
014 </navigation-case>
015 </navigation-rule>

Step 5: Configure (web.xml)
01 <context-param>
02 <param-name>
03 javax.faces.application.CONFIG_FILES
04 </param-name>
05 <param-value>/WEB-INF/faces-config.xml
06 </param-value>
07 </context-param>
08 <servlet>
09 <servlet-name>Faces Servlet</servlet-name>
10 <servlet-class>
11 javax.faces.webapp.FacesServlet</servlet-class>
12 <load-on-startup> 1 </load-on-startup>
13 </servlet>
14 
15 <servlet-mapping>
16 <servlet-name>Faces Servlet</servlet-name>
17 <url-pattern>/faces/*</url-pattern>
18 </servlet-mapping>

JSF Application directory structure
WEB-INF/web.xml
WEB-INF/faces-config.xml
WEB-INF/classes/LoginFormBean.class
login.jsp
Required Jars:
WEB-INF/lib/jsf-api.jar
WEB-INF/lib/jsf-ri.jar
WEB-INF/lib/jstl.jar
WEB-INF/lib/jsf-el.jar
WEB-INF/lib/standard.jar
WEB-INF/lib/commons-beanutils.jar
WEB-INF/lib/commons-digester.jar
WEB-INF/lib/commons-collections.jar
WEB-INF/lib/commons-logging.jar

 JSF: Server side UI component framework
 MVC
 Developing application in JSF
Summary

Reference
 http://www.jsfcentral.com/reading/index.html
 http://java.sun.com/j2ee/javaserverfaces/
 http://www.jcp.org/en/jsr/detail?id=127

Q&A
deepak.goyal@sun.com
vikas.varma@sun.com

Java server faces

Recommended

More Related Content

What's hot (20)

Similar to Java server faces (20)

Recently uploaded (20)

Java server faces