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Published Date:31-07-2017
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Struts and JavaServer Faces
Ken Paulsen
Staff Engineer
Sun Microsystems, Incorporated
(Slides by Craig McClanahan)Agenda
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Brief description of JavaServer Faces
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Struts or JavaServer Faces?
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Future directions
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Summary
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Creator Demo
2 Struts and JavaServer FacesJavaServer Faces Is ...
A server side user interface
component framework for
Java-based web applications
3 Struts and JavaServer FacesBackground
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Web applications a popular entry point
for developers new to Java
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Powerful foundational technologies:
–
Servlet API
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JavaServer Pages (JSP)
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JSP Standard Tag Library (JSTL)
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Portlet API
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But no common component standard
4 Struts and JavaServer FacesBackground
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Web applications also represent a key
opportunity to attract a new developer
market segment to Java
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Corporate developers
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Attracting this population required
something different
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Ease of use is the 1 criteria
5 Struts and JavaServer FacesFundamental Requirements
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Accessible to corporate developers
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Accessible to tools
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Client device neutral
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Usable with or without JSP
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Usable with or without HTML
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Scalable to enterprise applications
6 Struts and JavaServer FacesBasic Capabilities
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Extensible user interface (UI)
component model
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Flexible rendering model
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Event and listener handling model
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Per-component validation framework
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Basic page navigation support
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Internationalization and accessibility
7 Struts and JavaServer FacesArchitecture Overview
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UIComponent – Basic component API
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JavaBean class with default base
implementation class (UIComponentBase)
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Contains render-independent properties
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Standard generic components:
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Examples: UICommand, UIInput, UIOutput
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Concrete component subclasses with
HTML-specific properties and behaviors
8 Struts and JavaServer FacesValue Binding Expressions
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Components may have a local value
–
Rendered at output time
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Updated on subsequent form submit
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Components may be bound to a model
tier value
–
customer.address.city
–
Syntax based on JSTL/JSP 2.0 EL
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Semantics identical when rendering
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Nearly all properties may be bound
9 Struts and JavaServer FacesMethod Binding Expressions
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Specialized version of value binding
expression
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Last element of the expression points
at a method instead of a property
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Used to bind command components to
the corresponding action method that
should be called when component is
activated
10 Struts and JavaServer FacesEvents and Listeners
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Standard JavaBeans event pattern
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Strongly typed events and listeners
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Two standard events:
–
ActionEvent – broadcast when a UICommand
component is activated by the user
–
ValueChangeEvent – broadcast when a UIInput
component has been validated, and the new
value differs from the old value
11 Struts and JavaServer FacesConverters and Validators
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Converters – Plugins for String-Object
conversion
–
Render time – Object to String
–
Update time – String to Object
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Validators – Plugins for correctness
checking
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Default implementations for common
use cases
12 Struts and JavaServer FacesApplication Interface
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JavaServer Faces provides a default
ActionListener for every UICommand
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UICommand may contain a method binding to
an action method to be executed
–
Each UICommand may have its own method, or
they may share
–
Action method invoked “immediately” or after
validation
–
Return logical outcome used for navigation
13 Struts and JavaServer FacesPage Navigation Model
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Pluggable NavigationHandler called to
perform navigation duties
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Default implementation uses
configured navigation rules based on:
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What page submitted this form?
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Which action method was invoked?
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What logical outcome was returned?
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Result: navigate to new page or
redisplay old page
14 Struts and JavaServer FacesManaged Bean Creation Facility
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In a value binding or method binding
expression, the first element is special
–
“Magic” values – provide access to request or
application data
–
“Non-magic” values – search request, session,
and application scope (like jsp:useBean)
–
If not present, automatically instantiate a
bean, put it in scope, and populate properties
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Generalized verison of Struts form
beans
15 Struts and JavaServer FacesBusiness Logic In Backing Beans
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Most JavaServer Faces applications will
organize event handling code for a
particular form into a corresponding
JavaBean class (“backing bean”)
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Typical backing bean is also a
managed bean, put in request scope
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Similar in concept to ASP.Net “code
behind files”
16 Struts and JavaServer FacesRequest Processing Lifecycle
17 Struts and JavaServer FacesJSF In Action
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The JSF RI ships with several samples
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samples/jsf-cardemo.war
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Can be dropped into any Servlet 2.3 /
JSP 1.2 (i.e. J2EE 1.3 or later) container
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We will see a demo using Creator
18 Struts and JavaServer FacesAgenda
●
Brief description of JavaServer Faces
●
Struts or JavaServer Faces?
●
Future directions
●
Summary
●
Creator Demo
19 Struts and JavaServer FacesStruts or JavaServer Faces?
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Long answer on Craig's blog:
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http://blogs.sun.com/roller/page/craigmcc
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/20040927struts_or_jsf_struts_and
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Strusts and JSF provide 2 architectures
for building Model 2 based webapps
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But is it an either-or choice?
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No – You can use them together
20 Struts and JavaServer Faces
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