Oracle JDeveloper 10g Overview

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(No Transcript)
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Web Development with
Karsten Schulz Terp-Nielsen Master Principal
Sales Consultant Oracle Denmark
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Agenda

• JDeveloper 10g overview
• Application Developer Framework (ADF)
• Web Development with Struts

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Full Lifecycle Support
Design

DataModeling
Application Modeling
Infrastructure
IDE Platform
Build

Coding
Test

Debugging
Tuning
Configuration Management
Deploy

Deployment
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JDeveloper Framework Support

• J2EE Frameworks
• Application Development Framework (ADF)
• Apache Struts support
• ADF Business Components
• Oracle 9i/AS10g Toplink
• UiX
• Java Server Faces (JSF)

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Oracle ADFEnd-to-end J2EE Framework

• Implements standard J2EE best practices
• Model-View-Controller (MVC) design pattern
• Focus on the application, not the plumbing
• Consolidation and evolution of previous frameworks

Web and Wireless Clients
Rich Clients
Controller
Model
Business Services
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ADF Productivity With Choice
Rich Client
Web / Wireless
View
Swing / JClient
JSP
ADF UIX
JSF
Controller
Struts
ADF Bindings
Model
ADF Data Control
BusinessServices
JavaClasses
EJBSessionBeans
WebServices
ADF Metadata Services
JDBC
TopLinkQueries
EJBFinders
DataAccess
PersistentBusinessObjects
Java Classes
EJB Entity Beans
TopLink Mapping
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StrutsModel 1 Architecture

• Browser access JSP pages JSPs access JavaBeans
  that represent model
• Control de-centralized current page display,
  determined next page to display
• Complex navigation requires use of scriplet code
• Blurs the line between presentation and
  navigation code and making reuse difficult
• Not a model to use in practice - maintenance
  difficult and does not scale well

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StrutsModel 1 Architecture
Model 1
Decentralized controller - in each JSP page
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StrutsModel 1 Architecture
No MVC - Statically Linked Pages
Servlet/JSP
Servlet/JSP
Servlet/JSP
Servlet/JSP
Web Server
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StrutsModel-View-Controller Model 2

• Introduces a controller servlet
• Controller Servlet handle the data access and
  navigational flow
• JSPs handle presentation
• Controller centralizes the logic for dispatching
  requests to the next view based on the request
  URL, input parameters, and application state
• Controller also handles view selection, which
  decouples JSP pages and servlets from one another

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StrutsModel-View-Controller Model 2
Controller
HTTP
State Change
JavaBean
Request
Servlet
View Selection
User Actions
JDBC
Database
HTTP
Enterprise
Response
State Query
JavaBean
JSP
Change Notification
View
Model
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StrutsModel-View-Controller Model 2
Applying MVC to a Page Flow
Web Server
Servlet/JSP Controller
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StrutsWhat is It ?

• Open source Apache Jakarta Project
• An implementation of MVC paradigm
• A framework written in Java, to build web tier
  employing servlets, JSPs and XML
• De facto standard for J2EE MVC applications
• Bundled with JDeveloper and works on OC4J

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StrutsComponents

• ActionServlet class Part of controller that
  receives user input and state changes and issues
  view selections
• Action class Part of controller that interacts
  with model to execute a state change or query
• ActionForm Beans Data (from Form) bundled into
  Javabean for reuse and perform validation
• ActionForward class stores path to a page where
  the user is sent to
• ActionMapping holds mapping that tells
  controller which Actions, ActionForms,
  ActionsForwards to use

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StrutsComponents (2)

• Struts-config.xml Glue of the framework - holds
  declarations of the earlier listed components and
  other details. ActionServlets reads this file
  and create the configuration objects in memory
• Strut Tag Libraries Custom tags that simplify
  working with Struts aiding the view component and
  access Model thru Java Beans
• Property files store messages and handle
  different languages

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StrutsStruts Pictorially
Web Browser
Jsp 1
Jsp 3
Jsp 2
Page 1
View Layer
request/session
App Server
JSP Engine
Form Bean 1
Form Bean 2
Other Bean 1
Controller
Struts- config. xml
Mappings
Action2 .java
Action3 .java
Action4 .java
Action1 .java

• path
• action
• form bean
• forwards

Business Logic Layer
Business Bean 1
Business Bean 2
Business Bean 3
JDBC
Data Layer
Database
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StrutsActionForm

• Holds state and behavior for user input
• ActionForms are JavaBeans with reset() and
  validate() methods for user input
• ActionForm extends org.apache.struts.action.Action
  Form
• Typically one ActionForm bean created for each
  HTML form
• ActionForm has corresponding property for each
  field on HTML form

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StrutsActionForm Example
public final class FAQForm extends ActionForm
private String question private String
answer .. public String getQuestion()
return question public void
setQuestion(String question) this.question
question .. public ActionErrors
validate(ActionMapping mapping,
HttpServletRequest request)
ActionErrors errors new ActionErrors() if
((getQuestion() null) (getQuestion().length(
) lt 1)) errors.add("question",
new ActionError("errors.question.required
")) .. return errors
lt!-- Logon form bean definition in
struts-config.xml  --gt ltform-bean
name"FAQForm" type"faqapp.web.struts.forms.FAQFo
rm" /gt
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StrutsAction

• Action class receives the ActionForm(which holds
  the data) and you perform action/processing here
• Action provides a loose coupling between Web tier
  and business tier
• Controller decides which Action class, using the
  mapping info
• Action is invoked by calling perform() method

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StrutsAction - Example
public final class FAQQueryAction extends Action
public ActionForward perform(ActionMapping
mapping, ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws
IOException, ServletException String
result null ... try
result FAQHelper.getFAQHelper().query(actionForm
, request) request.setAttribute("action"
, Constants.QUERY) ...
return mapping.findForward(result)
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StrutsActionMapping

• ActionMapping object maps the Actions to URI, or
  path
• Specified in struts-config.xml

ltaction-mappingsgt ltaction
path"/faqQuery" type"faqapp.web.struts.a
ctions.FAQQueryAction"
name"FAQQueryForm" scope"request"
validate"true" input"/faqQuery.do"gt lt/acti
on-mappingsgt
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StrutsActionForward

• Encapsulates the destination of where to send
  control upon completion of the Action
• The destination(JSP, HTML file , servlet) is
  detailed in the configuration file
  struts-config.xml
• Objects that have logical name for referring and
  a path property

lt! -- Forward Definition in struts-config.xml  
--gt ltforward name"success"
path"/WEB-INF/FAQQuery.jsp"/gt
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StrutsActionServlet

• Primary task is to route request URI to an Action
  class using the configuration information(struts-c
  onfig.xml)
• Is the director - working behind the scene,
  administering the behavior of controller
• Configured using web.xml of the application and
  mapped to receive url patterns such as .do
• Only one ActionServlet can be loaded for an
  application
• Used as a black box in most cases, though it can
  be extended

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Strutsstruts-config.xml

• Holds declarations of Struts components that
  define the configuration
• Living blueprint of your application
• What fields are on the forms
• Where JSPs are found
• Knows about every action and the resources needed
• Power and flexibility of Struts is due to
  extracting out configuration information, across
  the frame work into struts-config.xml

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Strutsstruts-config.xml - Example
lt?xml version"1.0" encoding"ISO-8859-1"
?gt lt!DOCTYPE struts-config PUBLIC "-//Apache
Software Foundation//DTD Struts Configuration
1.0//EN "http//jakarta.apache.org/struts/dtds/s
truts-config_1_0.dtd"gt ltstruts-configgt lt!--
Form Bean Definitions
  --gt lt!-- FAQForm
form bean   --gt   ltform-bean name"FAQForm"
type"faqapp.web.struts.forms.FAQForm/gt  
ltform-bean name"FAQQueryForm
type"faqapp.web.struts.forms.FAQQueryForm" /gt
lt!-- Global Forward Definitions
  --gt ltglobal-forwards
type"org.apache.struts.action.ActionForward"gt 
ltforward name"error" path /WEB-INF/Error.jsp"
/gt   ltforward name"warning" path
/WEB-INF/Warning.jsp" /gt  
lt/global-forwardsgt lt!-- Action
Mapping Definitions   --gt
ltaction-mappingsgt ltaction path"/faqQuery"
type"faqapp.web.struts.actions.FAQQueryAction"
name"FAQQueryForm" scope"request"
validate"true" input"/faqQuery.do"gt lt/action-map
pingsgt  lt/struts-configgt
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StrutsA Look into web.xml
ltservletgt  ltservlet-namegtactionlt/servlet-namegt
  ltservlet-classgtorg.apache.struts.action.Actio
nServletlt/servlet-classgt ltinit-paramgt 
ltparam-namegtapplicationlt/param-namegt  
ltparam- valuegtApplicationResourceslt/param-valuegt
  lt/init-paramgt ltinit-paramgt 
ltparam-namegtconfiglt/param-namegt  
ltparam-valuegt/WEB-INF/struts-config.xmllt/param-val
uegt lt/init-paramgt ltinit-paramgt 
ltparam-namegtdebuglt/param-namegt  
ltparam-valuegt2lt/param-valuegt   lt/init-paramgt
ltinit-paramgt  ltparam-namegtdetaillt/param-nam
egt   ltparam-valuegt2lt/param-valuegt  
lt/init-paramgt lt/servletgt
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How it all Works
Jsp 1
Jsp 2
Jsp 3
Jsp 2
Jsp 2
Page 1
pure HTML sent to browser
Web Browser
processes custom tags fill form elements from
beans, display internationalized messages
Application Server
request/session
View Layer
incoming requests
Form Bean 1
Jsp Engine
Form Bean 2
relevant page called
if submit, auto populates form bean from request
params

creates/reuses any associated form bean






reads on start-up
Controller
Struts- config. xml
looks up path to determine action/ form bean
creates
passes control to relevant action to handle
returns appropriate forward
Mappings
Action2 .java
Action3 .java
Action1 .java

• path
• action
• form bean
• forwards

interacts with lower layers - acts as adaptor
between HTTP and layers below
gets data to display (adds to beans in
request/session)or saves data from beans via
business rules
Business Logic Layer
Business Bean 1
Business Bean 2
Business Bean 3
Data Layer
Business Data
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StrutsJSP Tag Libraries

• HTML JSP custom tags
• bridge between a JSP view and the other
  components of a Web application
• Tags relating to HTML forms, message and error
  handling, maintaining hyperlinks and
  internalization
• Bean JSP custom tags
• Tags useful for accessing beans, their
  properties,and defining beans based on access
• Create new beans based on the value of request
  cookies, headers, and parameters in any scope
• Logic tags
• Tags for conditional generation of output text,
  looping, comparison/sub-string matching

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StrutsUsing Struts JSP tags
lt_at_ taglib uri"/tags/struts-bean" prefix"bean"
gt lt_at_ taglib uri"/tags/struts-html"
prefix"html" gt lt_at_ taglib uri"/tags/struts-logi
c" prefix"logic" gt ltHTMLgt ltHEADgt ltTITLEgtWelcome!
lt/TITLEgt lthtmlbase/gt lt/HEADgt ltBODYgt ltlogicpresen
t name"user"gt ltH3gtWelcome ltbeanwrite
name"user" property"username"/gt!lt/H3gt lt/logicpr
esentgt ltlogicnotPresent scope"session"
name"user"gt ltH3gtWelcome World!lt/H3gt lt/logicnotPr
esentgt lthtmlerrors/gt ltULgt ltLIgtlthtmllink
forward"logon"gtSign inlt/htmllinkgtlt/LIgt ltlogicpr
esent name"user"gt ltLIgtlthtmllink
forward"logoff"gtSign outlt/htmllinkgtlt/LIgt lt/logic
presentgt lt/ULgt ltIMG src'struts-power.gif'
alt'Powered by Struts'gt lt/BODYgt lt/HTMLgt
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Demonstration

• Develop a Web Application based on Struts and
  EJBs as the model