What is JSF
- UI component based Java Web application framework
- UI components and their state are represented on the server with a defined life-cycle
- JSF Application have UI Component / Configuration File ( faces-config.xml / web.xml )
Configuration
Files :
faces-config.xml Manages :
Managed
Bean
Navigation
validators
data
converters
(
Once you define the object ("Person") in faces-config.xml you can use
the attributes of Person in your JSF UI components, e.g. by binding the value
"firstName" of this object to an JSF input field. )
web.xml
You
must specify in web.xml that a "FacesServlet" is responsible for
handling JSF applications. "FacesServlet" is the central controller
for the JSF application. "FacesServlet" receives all requests for the
JSF application and initializes the JSF components before the JSP is displayed.
Value and Method Binding
In
JSF you do not need to specify the get() or set() method but just the variable
name.
JSF
universal Expression Language (EL) uses
#{...}. These are only evaluated when needed opposite to JSP EL which
are always executed .
JSF Main features
- based on the Model-View-Controller concept
- stateful UI component model, e.g. each component is aware of its data
- separates the functionality of a component from the display of the component
- support listeners on UI components
- support data validation, data binding and data conversion between the UI and the model
JSP vs Facelets
As being a MVC (Model-View-Controller) framework, JSF
provides the FacesServlet as the sole request-response Controller. It takes
all the standard and tedious HTTP request/response work from your hands, such
as gathering user input, validating/converting them, putting them in model
objects, invoking actions and rendering the response.
JSF 2.0
Unlike JSF 1.x, almost everything is declared in faces-config.xml, with JSF 2.0, you are allowed
to use annotation to declare navigating, managed bean . It uses Facelets .
Bean Management :
There are 2 ways to
manage beans in JSF
- Entry in faces-config.xml
- Using Annotation
In faces-config.xml
version="1.0" encoding="UTF-8"?>
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd"
version="2.0">
Using
Annotation :
package com.manish.common;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import java.io.Serializable;
@ManagedBean
@SessionScoped
public class HelloWorldBeanimplements Serializable {
private static final long serialVersionUID = 1L;
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import java.io.Serializable;
@ManagedBean
@SessionScoped
public class HelloWorldBeanimplements Serializable {
private static final long serialVersionUID = 1L;
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Quick Start
- JSF 2.0 + Ajax hello world example
- How to make Eclipse IDE supports JSF 2.0
- Resources (library) in JSF 2.0
Managed Bean
More
Example on Refer
