g l a r i m y training on struts 2 · g l a r i m y training on struts 2 krishna mohan koyya,...

G l a r i m y Training on

Struts 2Krishna Mohan Koyya, M.Tech, DBM, PMP

Technology Consultant & Corporate Trainerkrishna@glarimy.com | www.glarimy.com

091-9731 4231 66

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Agenda• Session 1

– Breaking the Ice with Introduction– PreTest– MVC Framework– DI & AOP

• Session 2– Struts Architectural Goals– Struts Architecture– Hello World

• Session 3– Actions– Interceptors

• Session 4– Validation Framework– Internationalization

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• Call me Krishna– Originally from Tadepalligudem in

Andhra Pradesh– Have been in Bengaluru for the last

10 years• Held various positions in the IT

Industry– Worked on development of huge

systems • Extensive work in the areas of

– Object Orientation– Distributed Systems– Network Management Systems– Java Technologies

Krishna Mohan Koyya

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• Graduation– B.E. in Electronics & Communication Engineering

• SRKR Engineering College, Bhimavaram, affiliated to Andhra University, Visakhapatnam

• 1989-1993• Post Graduation

– M.Tech in Computer Science & Technology• College of Engineering, Andhra University, Visakhapatnam• 1995-1997

• Certifications– PMP (Project Management Professional)

• PMI® USA• 2005

• Others– Diploma in Business Management (Finance)

• ICFAI, Hyderabad• 2007

Academics

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• A total of 13 years of experience with the IT Industry• Since July 2008

– Technology Consultant & Corporate Trainer– Runs G l a r i m y, online skill development portal

• June 2007- May 2008– Associate Professor & HOD of Department of IT– Sasi Institute of Technology and Engineering, Tadepalligudem, India

• Jan 2006 – Dec 2006– Chief Executive Officer– Sudhari IT Solutions India Private Limited, Bangalore, India

• Dec 2000 – Jan 2006– Software Engineer– Cisco Systems India Private Limited, Bangalore, India

• Nov 1998 – Dec 2000– Senior Software Engineer– Wipro Technologies, Bangalore, India

• Others– Dhanya Software for Hewlett-Packard ISO, Bangalore, India in 1998– Ace Software Exports Limited, Rajkot, India in 1997– Neo Software, Visakhapatnam in 1994-1995

Career

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• Basic– Java Induction http://www.glarimy.com/courses/gb01.php – Java http://www.glarimy.com/coursess/gb02.php – XML http://www.glarimy.com/courses/gb03.php – OOAD & UML http://www.glarimy.com/courses/gb04.php – Design Patterns http://www.glarimy.com/courses/gb05.php

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• Full list of courses– http://www.glarimy.com/courses

Training Courses

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BangaloreChennaiMysore

Hyderabad

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Agenda• Session 1

– Breaking the Ice with Introduction– PreTest– MVC Framework– DI & AOP

• Session 2– Struts Architectural Goals– Struts Architecture– Hello World

• Session 3– Actions– Interceptors

• Session 4– Validation Framework– Internationalization

Stru

ts2 F

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ewor

k

MVC Framework• Client Server Systems

– Clients– Server– Request/Response– Protocols

• The J2EE Web Architecture– Browser– Web Server– Java– Servlets– JSP– Business Logic

• FrontController– Model– View– Controller

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MVC Framework• Common Features

– Validation– Exception Handling– Navigation – Internationalization– Tiling– Data Binding– Data Conversion– Configuration– Session Management

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AOP• Cross Cutting Concerns

– Advice/Aspect– Join-points– Point-cuts– Advisor/Interceptor

• Weaving– Compile Time– Load Time– Compile Time

• Aspects– Validation– Security– Transaction– Conversion– Filters– Logging

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Dependency Injection• Object Orientation

– Classes/Objects– Relations

• Dependency• Association• Aggregation• Composition

• Inversion of Control– Injecting Dependencies– Java Bean Architecture

• Framework– Factory– Configuration (wiring)

• Advantages– Loose Coupling– Configurability– Testability

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Struts 2 Architectural Goals• Separation of Concerns

– Pre Action Logic– Obtaining Business Objects– Translation– Separation of Concerns

• Loose Coupling– URL to Action mapping– Results to View mapping– Exceptions to View mapping

• Testability– De-linking HTTP objects

• Modularization– Distributed Configuration– Plug-ins– Flexibility

• Convention– Not just configuration– Intelligent Defaults

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Struts 2 Architecture• Controller (Filter/Dispatcher)• Model-Action• View-Result• Interceptors• Value Stack• Object Graph Notation Language

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Struts 2 Actions• What they do?

– Encapsulates business logic– Point of data transfer– Returns control strings

• One for each request• POJO as Action

– Method: execute() returns String• Optional Action Interface

– Method: execute() returns String– Control Strings

• SUCCESS• INPUT• LOGIN• NONE• ERROR

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Struts 2 Actions• Basic Data Binding

– Fields to Bean Properties• Object Binding

– Fields to Model Objects– Bean Backed

• OGNL with dot notation: • Accessors for the object

– Model Driven• ModelDriven interface• getModel mothod• Model object instantiation• No re-initialization of the model object //NOTE THIS

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Struts 2 Actions• ActionSupport class

– Basic Validation• Interceptor: workflow• Interface: Validateable

– Method: validate• Interface: ValidateAware

– Methods: addFieldError, addActionError• Control String: input

– Basic Internationalization• Interface: TextProvider• Resource Bundles: properties files• Method: getText()

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Struts 2 Interceptors• ActionInvocation

– Interceptors– Action– Result– Method: invoke()

• Interceptor– Method: intercept

• Parameter: ActionInvocation– Pre-processing– ActionInvocation.invoke(); //result is rendered, please note this.– Post-processing and return result

• Stacks– Order of Interceptors– Default Stack– Basic Stack

• Categories– Utility Interceptors– Data Transfer Interceptors– Workflow Interceptors– Other Interceptors

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Struts 2 Interceptors• Deploying Interceptors

– Pacakge• Interceptors

– Interceptor with Name and class– Interceptor-stack with Name

» Interceptor-ref with name– Default-interceptor-ref with name (stack name)

– Action• Interceptor-ref with name• Default-intercetor-ref with name (also stack name)

• Building Interceptors– Intercetor interface– Methods:

• Destory• Init• intercept

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Struts 2 Interceptors• Important Interceptors

– Params: Sets request parameters into action– CreateSession: Creates HttpSession– I18n: Remembers locale– Validation: Validates using configuration– Workflow: Validates using action code– Exception: Maps exceptions to the result

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Struts 2 Data Converters• Value Stack

– Stack of Properties– Treated as its own properties

• OGNL– Language for Object Graph– Out side of Struts2

• Built-in-Converters– Primitive Types (and Wrappers)– Date– List, Map and array

• Custom Converters– Interface: TypeConvertor (OGNL)– Class: StrutsTypeConvertor (Struts)

• convertFromString• convertToString

– Deployment• <action>-conversion.properties• xwork-conversion.properties• Any where in the class path

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Java Development Kit 1.6• Installation

– Download URL• http://java.sun.com/j2se/downloads

– Installation• Double click on the installable and click Run on the pop-up dialog• Install it into C:\Program Files\Java\jdk1.6.0_14• Verify that you find folders like jre, bin, lib and etc are found under

C:\Program Files\Java\jdk1.6.0_14 folder• Create a new environment variable JAVA_HOME to C:\Program

Files\Java\jdk1.6.0_14• Create or edit PATH variable with value %JAVA_HOME%\bin

• Using Java – Type javac –version on command prompt

• javac 1.6.0_14 should be the response– Type java –version on command prompt

• Java version “1.6.0_14” should be the response

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Apache Tomcat 6.0.20• Installation

– Pre-requisites• Java 1.6• Setup JAVA_HOME

– Download URL• http://apache.mirrors.timporter.net/tomcat/tomcat-6/v6.0.20/bin/apache-tomcat-6.0.20.zip

– Installation• Extract the downloaded zip to C:\Program Files• Rename the apache-tomcat-6.0.20 to Tomcat for convenience• Set C:\Program Files\Tomcat as TOMCAT_HOME

– Default port number• 8080• Can be changed in the file %TOMCAT_HOME%\conf\server.xml

• Running/Stopping – To run - %TOMCAT_HOME%\bin\startup.bat– Default Homepage

• http://localhost:8080 or http://127.0.0.1:8080– Debugging - %TOMCAT_HOME%\logs– To stop - %TOMCAT_HOME%\bin\shutdown.bat

• Application Access– http://localhost:8080/<context-root>/<app-specific-resources>

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Tomcat with Eclipse• Installing Eclipse 3.4 (Ganymede)

– Assumption• JDK is already installed• Tomcat are already installed but not started (stop it, otherwise)

– Download http://www.eclipse.org/downloads/download.php?file=/technology/epp/downloads/release/galileo/R/eclipse-jee-galileo-win32.zip

– Unzip to C:\Program Files– Rename it to Eclipse for convenience

• Running Eclipse– Double click on eclipse.exe under Eclipse– Verify that J2EE perspective is opened

• Configuring Tomcat– Go to File->New->Other->Server->Server->Next– Select Apache-Tomcat v6.0 Server and click Next– Enter ‘C:\Program Files\Tomcat’ for ‘Tomcat installation directory’ and click

‘Finish’• Running Tomcat from Eclipse

– Select ‘servers’ tab (right-lower portion)– Right click on Tomcat and click ‘Start’– Select ‘Unblock’ if security alert pops-up

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For Technical Querieskrishna@glarimy.com

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