Web Component Development with Servlet and JSP Technologies, Java EE 6

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Web Component Development
with Servlet and JSP
Technologies, Java EE 6
Student Guide - Volume 1
SL-314-EE5 REV C.1
D61810GC10
Edition 1.0
D62412
Copyright © 2008, 2009, Oracle and/or its affiliates. All rights reserved.
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Copyright 2008 Sun Microsystems,Inc.All Rights Reserved.Sun Services,Revision C.1
Table of Contents
About This Course.............................................................Preface-xiii
Course Goals........................................................................ Preface-xiii
Course Map...........................................................................Preface-xiv
Topics Not Covered..............................................................Preface-xv
How Prepared Are You?.....................................................Preface-xvi
How to Learn From This Course...................................... Preface-xvi
Introductions.......................................................................Preface-xvii
How to Use Course Materials.........................................Preface-xviii
Conventions..........................................................................Preface-xix
Icons..............................................................................Preface-xix
Typographical Conventions.......................................Preface-xx
Additional Conventions.............................................Preface-xxi
Introduction to Web Application Technologies.............................1-1
Objectives........................................................................................... 1-1
Relevance.............................................................................................1-2
Additional Resources........................................................................1-3
Web Application Technologies........................................................1-4
HTTP Client-Server Architecture...........................................1-5
Web Site Structure.....................................................................1-5
Java™ Platform, Enterprise Edition 5 (Java EE 5).........................1-7
Java EE 5 SDK............................................................................1-7
Web Sites and Web Applications.....................................................1-9
Execution of CGI Programs.....................................................1-9
Advantages and Disadvantages of CGI Programs............1-12
Execution of Java Servlets......................................................1-12
Advantages and Disadvantages of Java Servlets...............1-14
Using Separate Processes or Using Threads.......................1-15
Java Servlets......................................................................................1-16
JavaServer Pages™ Technology.....................................................1-17
Concerns When Using Servlets and JSP™
Technology............................................................................1-19
Web Application – Three-Tier Architecture.................................1-20
Model-View-Controller (MVC) Architecture in a Web
Application....................................................................................1-22
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Model 2 Architecture..............................................................1-23
Model 2 Frameworks..............................................................1-25
Java EE Containers..................................................................1-25
Java EE Architecture Example..............................................1-27
Job Roles...................................................................................1-28
Web Application Migration...................................................1-29
Summary...........................................................................................1-31
Developing a View Component......................................................2-1
Objectives........................................................................................... 2-1
Relevance.............................................................................................2-2
Additional Resources........................................................................2-3
Designing a View Component.........................................................2-4
Types of View Components....................................................2-4
Soccer League Case Study...................................................... 2-5
List Leagues Analysis Model..................................................2-6
List Leagues Page Flow............................................................2-7
HTTP Revisited................................................................................2-12
Hypertext Transfer Protocol..................................................2-12
HTTP GET Method................................................................ 2-14
HTTP Request..........................................................................2-14
HTTP Request Headers..........................................................2-15
HTTP Response...................................................................... 2-16
HTTP Response Headers...................................................... 2-17
Web Container Architecture...........................................................2-18
Request and Response Process............................................ 2-19
Sequence Diagram of an HTTP GET Request.................... 2-23
Developing a Simple HTTP Servlet...............................................2-24
List Leagues Architecture Model..........................................2-24
The HttpServlet API............................................................2-25
The ListLeaguesServlet Class......................................... 2-29
Configuring and Deploying a Servlet...........................................2-33
Soccer League Web Application Structure..........................2-33
Configuring a Servlet Definition...........................................2-35
Configuring a Servlet Mapping............................................2-36
Complete Deployment Descriptor...................................... 2-37
Web Application Context Root.............................................2-38
Sun Java™ System Application Server Deployment.........2-38
WAR Files for Deployment...................................................2-40
Activating the Servlet in a Web Browser.............................2-41
Certification Exam Notes................................................................2-43
Summary...........................................................................................2-44
Developing a Controller Component.............................................3-1
Objectives........................................................................................... 3-1
Relevance.............................................................................................3-2
Additional Resources........................................................................3-3
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Designing Controller Components.................................................3-4
Types of Controller Components...........................................3-4
Add a New League Analysis Model......................................3-5
Add a New League Page Flow............................................... 3-7
Form Verification................................................................... 3-11
Soccer League Web Structure............................................... 3-12
Creating an HTML Form................................................................3-14
Add a New League Web Form.............................................3-14
The form Tag...........................................................................3-15
Textfield Component............................................................. 3-16
Drop-Down List Component............................................... 3-17
Submit Button......................................................................... 3-18
Complete HTML Form.......................................................... 3-19
How Form Data Is Sent in an HTTP Request..............................3-20
Form Data in the HTTP Request...........................................3-20
HTTP GET Method Request................................................. 3-21
HTTP POST Method Request............................................... 3-22
HTTP GET and POST Methods........................................... 3-23
Developing a Controller Servlet....................................................3-24
Add a New League Use Case Revisited..............................3-24
Servlet API to Retrieve Form Parameters............................3-26
Developing the AddLeagueServlet Servlet.......................3-27
Dispatching From the Controller to a View.................................3-31
Add a New League Use Case (Stage 2)................................3-31
Request Scope......................................................................... 3-33
Using a Request Dispatcher...................................................3-33
Developing the AddLeagueServlet Code..........................3-34
Developing the SuccessServlet Code..............................3-37
Certification Exam Notes................................................................3-41
Summary...........................................................................................3-42
Developing Dynamic Forms............................................................4-1
Objectives........................................................................................... 4-1
Relevance.............................................................................................4-2
Additional Resources........................................................................4-3
Servlet Life Cycle Overview.............................................................4-4
Servlet Class Loading...............................................................4-5
One Instance Per Servlet Definition.......................................4-6
The init Life Cycle Method...................................................4-7
The service Life Cycle Method.............................................4-8
The destroy Life Cycle Method.............................................4-9
Using Initialization Parameter to Customize the Add a New
League Form..................................................................................4-10
Add League Architecture Model (Stage 1)..........................4-11
The AddLeagueFormServlet Code.....................................4-12
Configuring Initialization Parameters................................ 4-13
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The ServletConfig API...................................................... 4-14
The AddLeagueFormServlet Code.................................... 4-16
Handling Errors in a Web Form....................................................4-17
Add League Analysis Model (Stage 2).................................4-17
Error Handling Screen Shots.................................................4-18
Add League Architecture Model (Stage 2)......................... 4-20
Soccer League Web Application Structure..........................4-21
The AddLeagueServlet Code..............................................4-22
The AddLeagueFormServlet Code.................................... 4-23
Repopulating Web Forms...............................................................4-26
Repopulating a Text Field......................................................4-28
Repopulating a Drop-Down List......................................... 4-29
Certification Exam Notes................................................................4-30
Summary...........................................................................................4-31
Sharing Application Resources Using the Servlet Context.........5-1
Objectives........................................................................................... 5-1
Relevance.............................................................................................5-2
Additional Resources........................................................................5-3
Purpose of the Servlet Context.........................................................5-4
Soccer League Demonstration.................................................5-4
Servlet Context......................................................................... 5-6
Developing a Servlet Context Listener.........................................5-10
League List Initialization Example.......................................5-10
Web Application Life Cycle...................................................5-10
Certification Exam Notes................................................................5-18
Summary...........................................................................................5-19
Designing the Business Tier...........................................................6-1
Objectives........................................................................................... 6-1
Relevance.............................................................................................6-2
Additional Resources........................................................................6-3
Describing the Analysis Model........................................................6-4
Register For a League Use Case Example.............................6-5
Domain Entities..................................................................................6-9
Player Entity Example........................................................... 6-10
Designing a Service Component....................................................6-13
Entity Service...........................................................................6-13
Façade Service.........................................................................6-20
Certification Exam Notes................................................................6-25
Summary...........................................................................................6-26
Developing Web Applications Using Struts..................................7-1
Objectives........................................................................................... 7-1
Relevance.............................................................................................7-2
Additional Resources........................................................................7-3
Struts Framework...............................................................................7-4
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Model-View-Controller Pattern............................................. 7-5
Front Controller Pattern.......................................................... 7-7
Struts MVC Framework.......................................................... 7-8
Developing a Struts Action Class..................................................7-10
Struts Action Class API.........................................................7-10
Creating an Action Class........................................................7-11
Configuring the Struts Action Mappings.....................................7-15
Configuring the Infrastructure Controller..........................7-15
Configuring Action Mappings..............................................7-17
Installing the Struts Library Files.........................................7-19
Certification Exam Notes................................................................7-21
Summary...........................................................................................7-22
Developing Web Applications Using Session Management........8-1
Objectives........................................................................................... 8-1
Relevance.............................................................................................8-2
Additional Resources........................................................................8-3
HTTP and Session Management......................................................8-4
Web Container Sessions...........................................................8-4
Designing Web Applications to Use Session Management.........8-5
Registration Use Case Example..............................................8-5
Registration Use Case Analysis Model................................. 8-6
Using Session Management in a Web Application.......................8-7
Session API................................................................................ 8-8
Storing Session Attributes........................................................8-9
Accessing Session Attributes................................................ 8-10
Destroying the Session...........................................................8-11
Using Cookies for Session Management......................................8-13
Cookie API.............................................................................. 8-14
Using Cookies Example........................................................ 8-15
Performing Session Management Using Cookies..............8-15
Using URL-Rewriting for Session Management.........................8-17
URL-Rewriting Implications................................................ 8-18
Certification Exam Notes................................................................8-19
Summary...........................................................................................8-20
Using Filters in Web Applications..................................................9-1
Objectives........................................................................................... 9-1
Relevance.............................................................................................9-2
Additional Resources........................................................................9-3
Web Container Request Cycle..........................................................9-4
Web Container Request Processing........................................9-4
Applying Filters to an Incoming Request............................. 9-5
Applying Filters to a Dispatched Request.............................9-7
Filter API.............................................................................................9-8
Developing a Filter Class..................................................................9-9
The PerformanceFilter Class..............................................9-9
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The init Method................................................................... 9-10
The doFilter Method.......................................................... 9-11
The destroy Method.............................................................9-12
Configuring the Filter......................................................................9-13
Declaring a Filter in the web.xml File..................................9-13
Declaring a Filter Mapping in the web.xml File.................9-13
Certification Exam Notes................................................................9-17
Summary...........................................................................................9-18
Integrating Web Applications With Databases...........................10-1
Objectives......................................................................................... 10-1
Relevance...........................................................................................10-2
Additional Resources......................................................................10-3
Mapping Sample Data Structures into Database Entities..........10-4
Designing a Web Application........................................................10-5
Domain Objects...................................................................... 10-6
Database Tables...................................................................... 10-7
Data Access Object (DAO) Pattern...................................... 10-9
DAO Pattern Advantages................................................... 10-10
JDBC™ API........................................................................... 10-11
Developing a Web Application Using a Database....................10-12
Traditional Approaches to Database Connections...........10-12
Using a DataSource and the JNDI API............................. 10-13
Configuring a DataSource and the JNDI API.................. 10-21
Summary.........................................................................................10-23
Developing JSP Pages..................................................................11-1
Objectives......................................................................................... 11-1
Relevance...........................................................................................11-2
Additional Resources......................................................................11-3
JavaServer Pages Technology.........................................................11-4
How a JSP Page Is Processed................................................ 11-7
Developing and Deploying JSP Pages.............................. 11-14
Writing JSP Scripting Elements....................................................11-15
Comments............................................................................. 11-16
Directive Tag......................................................................... 11-17
Declaration Tag.....................................................................11-17
Scriptlet Tag...........................................................................11-18
Expression Tag..................................................................... 11-20
Implicit Variables................................................................. 11-21
Using the page Directive..............................................................11-22
Using Standard Tags.....................................................................11-24
Other Standard Tags............................................................ 11-31
Using Expression Language (EL) Elements...............................11-33
Syntax Overview...................................................................11-33
Bean Access Using EL......................................................... 11-34
Unified Expression Language.............................................11-36
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Arithmetic Operators............................................................11-37
Comparisons and Logical Operators.................................11-38
Configuring the JSP Environment...............................................11-39
Certification Exam Notes..............................................................11-40
Summary.........................................................................................11-42
Developing JSP Pages Using Custom Tags................................12-1
Objectives......................................................................................... 12-1
Relevance...........................................................................................12-2
Additional Resources......................................................................12-3
The Java EE Job Roles Involved in Web Application
Development.................................................................................12-4
Designing JSP Pages with Custom Tag Libraries........................12-5
Contrasting Custom Tags and Scriptlet Code....................12-5
Developing JSP Pages Using Custom Tags.........................12-7
Custom Tag Library Overview.............................................12-8
Custom Tag Syntax Rules......................................................12-9
JSTL Sample Tags................................................................. 12-11
Using a Custom Tag Library in JSP Pages..................................12-17
Using an Empty Custom Tag..............................................12-18
Using a Conditional Custom Tag.......................................12-18
Using an Iterative Custom Tag.......................................... 12-19
JSTL Tags............................................................................... 12-21
Certification Exam Notes..............................................................12-27
Summary.........................................................................................12-28
Developing Web Applications Using Struts Action Forms........13-1
Objectives......................................................................................... 13-1
Relevance...........................................................................................13-2
Additional Resources......................................................................13-3
Struts Application Components....................................................13-4
Model Elements Review........................................................13-5
Control Elements Review......................................................13-6
View Elements Review...........................................................13-7
Developing an ActionForm Class.................................................13-8
The Add a New League Form...............................................13-8
The AddLeagueForm Class.....................................................13-9
Data Conversion....................................................................13-11
Writing the validate Method............................................13-11
Struts ActionError Class....................................................13-14
How the Controller Uses the Form Bean...........................13-15
Developing the JSP Code for a View Form................................13-18
Struts html Tag Library Overview.....................................13-18
Writing the JSP Code for a View Form............................. 13-19
Configuring the View Forms........................................................13-22
Configuring the Form Beans...............................................13-22
Configuring the View Aspects of the Actions.................13-22
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Certification Exam Notes..............................................................13-24
Summary.........................................................................................13-25
Building Reusable Web Presentation Components...................14-1
Objectives......................................................................................... 14-1
Relevance...........................................................................................14-2
Additional Resources......................................................................14-3
Complex Page Layouts....................................................................14-4
Presentation Segment Overview..........................................14-5
Organizing Presentation Segments......................................14-6
Including JSP Page Segments.........................................................14-7
Using the include Directive.................................................14-7
Using the jsp:include Standard Action.......................... 14-8
Using the jsp:param Standard Action................................14-9
Developing Layouts Using Struts Tiles......................................14-12
Layout JSP File.......................................................................14-12
Tiles Layout............................................................................14-15
Content Body.........................................................................14-16
Certification Exam Notes..............................................................14-17
Summary.........................................................................................14-18
Introducing JavaServer™ Faces Technology...............................A-1
Objectives.......................................................................................... A-1
Relevance............................................................................................A-2
Additional Resources.......................................................................A-3
JavaServer Faces Technology Overview........................................A-4
Introducing JavaServer Faces Technology...........................A-4
Components of a JavaServer Faces Technology-Based Web
Application............................................................................A-6
Comparison of JavaServer Faces Technology With Struts
Framework...........................................................................A-10
Key JavaServer Faces Concepts...........................................A-11
UI Component Model............................................................A-12
UI Component Classes..........................................................A-12
DVD Library Sample Project: Use Cases.....................................A-14
Quick Reference for HTML..............................................................B-1
Objectives........................................................................................... B-1
Additional Resources........................................................................B-2
HTML and Markup Languages.......................................................B-3
Definition....................................................................................B-3
Types of Markup.......................................................................B-3
Simple Example.........................................................................B-4
Creating an HTML Document.........................................................B-5
Tag Syntax..................................................................................B-5
Comments................................................................................. B-6
Spaces, Tabs, and New Lines Within Text............................B-6
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Character and Entity References.............................................B-6
Creating Links and Media Tags.......................................................B-8
The A Element and the HREF Attribute...................................B-8
The IMG Element and the SRC Attribute............................... B-9
The APPLET Element.................................................................B-9
The OBJECT Element...............................................................B-10
Text Structure and Highlighting....................................................B-11
Text Structure Tags.................................................................B-11
Text Highlighting................................................................... B-14
HTML Forms....................................................................................B-15
The FORM Tag...........................................................................B-15
HTML Form Components.................................................... B-17
Input Tags............................................................................... B-18
Text Fields............................................................................... B-19
Submit Buttons....................................................................... B-20
Reset Button.............................................................................B-21
Checkboxes............................................................................. B-22
Radio Buttons......................................................................... B-23
Password................................................................................. B-24
Hidden Fields..........................................................................B-24
The SELECT Tag...................................................................... B-25
The TEXTAREA Tag...................................................................B-26
Creating HTML Tables....................................................................B-27
Advanced HTML.............................................................................B-30
JavaScript™ Programming Language.................................B-30
CSS........................................................................................... B-32
Frames...................................................................................... B-36
Quick Reference for HTTP..............................................................C-1
Objectives.......................................................................................... C-1
Additional Resources.......................................................................C-2
HTTP Overview................................................................................C-3
Definition...................................................................................C-3
Request Structure..............................................................................C-4
HTTP Methods........................................................................ C-5
Request Headers..................................................................... C-6
Response Structure...........................................................................C-8
Response Headers................................................................... C-9
Status Codes............................................................................C-10
CGI Overview..................................................................................C-12
Environment Variables Set...................................................C-12
Data Formatting.....................................................................C-14
Quick Reference for the Ant Tool..................................................D-1
Objectives.......................................................................................... D-1
Additional Resources.......................................................................D-2
Ant Overview....................................................................................D-3
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Build File Structure...........................................................................D-4
Projects.......................................................................................D-4
Targets...................................................................................... D-5
Tasks..........................................................................................D-5
Properties................................................................................. D-6
Ant Special Features.........................................................................D-7
Patterns......................................................................................D-7
The fileset Element............................................................. D-8
Filtering.....................................................................................D-8
The filter Task......................................................................D-9
Basic Built-in Ant Tasks.................................................................D-10
The copy Task.........................................................................D-10
The delete Task................................................................... D-12
The mkdir Task..................................................................... D-13
The echo Task.........................................................................D-13
The javac Task..................................................................... D-14
The javadoc Task................................................................. D-15
The jar Task.......................................................................... D-16
Complete Ant Build File...................................................... D-17
Executing Ant..................................................................................D-20
Installing Ant...................................................................................D-21
System Requirements............................................................D-21
Ant Environment Setup........................................................D-21
Quick Reference for UML................................................................E-1
Objectives........................................................................................... E-1
Additional Resources........................................................................E-2
UML Fundamentals...........................................................................E-3
General Elements...............................................................................E-6
Packages.....................................................................................E-6
Stereotypes.................................................................................E-8
Annotation.................................................................................E-8
Constraints.................................................................................E-9
Tagged Values...........................................................................E-9
Use Case Diagrams..........................................................................E-10
Class Diagrams.................................................................................E-11
Class Nodes..............................................................................E-11
Inheritance................................................................................E-14
Interface Implementation...................................................... E-15
Association, Roles, and Multiplicity................................... E-16
Aggregation and Composition.............................................E-17
Association Classes.................................................................E-18
Other Association Elements..................................................E-21
Object Diagrams...............................................................................E-22
Collaboration Diagrams..................................................................E-24
Sequence Diagrams..........................................................................E-26
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Statechart Diagrams.........................................................................E-29
Transitions............................................................................... E-30
Activity Diagrams............................................................................E-31
Component Diagrams.....................................................................E-35
Deployment Diagrams....................................................................E-37
Quick Reference for XML................................................................F-1
Objectives........................................................................................... F-1
Additional Resources........................................................................F-2
Introduction to XML..........................................................................F-3
Simple Example.........................................................................F-3
Basic Syntax........................................................................................F-4
Well-Formed XML Documents...............................................F-4
Validity and DTDs....................................................................F-5
DTD-specific Information....................................................... F-7
Schemas...............................................................................................F-9