Spring Framework Rohit

Spring Framework Rohit

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  The Spring FrameworkTrainingGet to know Spring FrameworkRohit Prabhakarhttp://rohitprabhakar.com
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  Get to knowSpring FrameworkThe Spring Framework: OverviewTopics:What is Spring?
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  Spring modules
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  Why use Spring
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  Dependency injection /IOC in detail
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  Lab WorkGet toknow Spring FrameworkWhat is Spring?The Spring Framework is an open source application framework for the Java platform and .NET Framework (Spring.NET)  It is based on code published in Expert One-on-One J2EE Design and Development by Rod Johnson (Wrox, 2002).“Spring is an open source framework created to address the complexity of enterprise application development. One of the chief advantages of the Spring framework is its layered architecture, which allows you to be selective about which of its components you use while also providing a cohesive framework for J2EE application development.
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  Get to knowSpring FrameworkHow does the Spring Framework looks like?
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  Get to knowSpring FrameworkHow does the Spring Framework looks like?Each of the modules (or components) that comprise the Spring framework can stand on its own or be implemented jointly with one or more of the others. The functionality of each component is as follows:The core container: The core container provides the essential functionality of the Spring framework. A primary component of the core container is the BeanFactory, an implementation of the Factory pattern. The BeanFactory applies the Inversion of Control (IOC) pattern to separate an application's configuration and dependency specification from the actual application code.Spring context:The Spring context is a configuration file that provides context information to the Spring framework. The Spring context includes enterprise services such as JNDI, EJB, e-mail, internalization, validation, and scheduling functionality.Spring AOP:The Spring AOP module integrates aspect-oriented programming functionality directly into the Spring framework, through its configuration management feature. As a result you can easily AOP-enable any object managed by the Spring framework. The Spring AOP module provides transaction management services for objects in any Spring-based application. With Spring AOP you can incorporate declarative transaction management into your applications without relying on EJB components.
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  Get to knowSpring FrameworkHow does the Spring Framework looks like?Spring DAO:The Spring JDBC DAO abstraction layer offers a meaningful exception hierarchy for managing the exception handling and error messages thrown by different database vendors. The exception hierarchy simplifies error handling and greatly reduces the amount of exception code you need to write, such as opening and closing connections. Spring DAO's JDBC-oriented exceptions comply to its generic DAO exception hierarchy.Spring ORM:The Spring framework plugs into several ORM frameworks to provide its Object Relational tool, including JDO, Hibernate, and iBatis SQL Maps. All of these comply to Spring's generic transaction and DAO exception hierarchies.Spring Web module:The Web context module builds on top of the application context module, providing contexts for Web-based applications. As a result, the Spring framework supports integration with Jakarta Struts. The Web module also eases the tasks of handling multi-part requests and binding request parameters to domain objects.Spring MVC framework:The MVC framework is a full-featured MVC implementation for building Web applications. The MVC framework is highly configurable via strategy interfaces and accommodates numerous view technologies including JSP, Velocity, Tiles, iText, and POI.
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  Get to knowSpring FrameworkWhat does Spring Framework Offers: SummaryInversion of Control container: configuration of application components and lifecycle management of Java objectsAspect-oriented programming: enables implementation of cross-cutting routinesData access: working with relational database management systems on the Java platform using JDBC and object-relational mapping toolsTransaction management: unifies several transaction management APIs and coordinates transactions for Java objectsModel-view-controller: a HTTP and Servlet-based framework providing hooks for extension and customizationRemote Access framework: configurative RPC-style export and import of Java objects over networks supporting RMI, CORBA and HTTP-based protocols including web services (SOAP)Convention-over-configuration: a rapid application development solution for Spring-based enterprise applications is offered in the Spring Roo moduleBatch processing: a framework for high-volume processing featuring reusable functions including logging/tracing, transaction management, job processing statistics, job restart, skip, and resource managementAuthentication and authorization: configurable security processes that support a range of standards, protocols, tools and practices via the Spring Security sub-project (formerly Acegi).Remote Management: configurative exposure and management of Java objects for local or remote configuration via JMXMessaging: configurative registration of message listener objects for transparent message consumption from message queues via JMS, improvement of message sending over standard JMS APIsTesting: support classes for writing unit tests and integration tests
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  Get to knowSpring FrameworkWhy use Spring?Have you ever encountered these question?Cant’ I have a simpler solution?
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  How can Ihandle my every changing requirements?
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  How can bethe architecture flexible?
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  Can’t I haveeverything in components which can be verified independently?
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  Can I makea plug and play software?
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  How can thesoftware components reusable and changeable?
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  Should we useEJB? As it makes the product complex, unpredictable and un-maintainable, non-portable and everything is framework committed.
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  …………….. And manymore like theseSPRING IS THE ANSWER!
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  Get to knowSpring FrameworkSpring Framework’s Mission StatementWe believe that:J2EE should be easier to use
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  It is bestto program to interfaces, rather than classes. Spring reduces the complexity cost of using interfaces to zero.
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  JavaBeans offer agreat way of configuring applications.
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  OO design ismore important than any implementation technology, such as J2EE.
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  Checked exceptions areoverused in Java. A platform shouldn't force you to catch exceptions you're unlikely to be able to recover from.
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  Testability is essential,and a platform such as Spring should help make your code easier to test.We aim that:Spring should be a pleasure to use
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  Your application codeshould not depend on Spring APIs
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  Spring should notcompete with good existing solutions, but should foster integration. (For example, JDO, Toplink, and Hibernate are great O/R mapping solutions. We don't need to develop another one.)Get to know Spring FrameworkAre there any benefits of using spring?Pure JavaFounded on POJO-based development Ordinary Java classes that follow no special APIsNon-invasive for pre-existing POJOs
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  Rewards framework-independent businesslogic
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  Encourages new softwareto be written as POJOs
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  Results in highlyportable, reusable, and verifiable softwareLess Custom CodeExpand capabilities with less code
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  Extensive and testedservice abstractions
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  Email, JMS, JMX,JSF, JDBC, etc…
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  Replaces generic corporatelibraries
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  Mitigates custom integrationactivities
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  Consistency eases integrationbecause
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  spring platform iseasy to useTurn-key solutionSpring components can be integrated quickly, with minimal effort and predictable results
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  Get to knowSpring FrameworkAre there any benefits of using spring?Helps only where neededModularity allows only relevant components to be introduced into the application.
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  For instance chooseone:
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  Spring BeanFactory
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  Spring JMX
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  Spring JDBC
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  Framework can beinterfaced in deep or shallow layers.
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  Interfaces are consistentat each layerWidely AvailableSpring is integrated into numerous frameworks
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  Broad adoption possiblebecause the container is portable and lightweight
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  The container itselfis designed as a POJO
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  Integration without third-partysupport
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  Performance overhead israrely a consideration as it is not EJB ;)Get to know Spring Framework?
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  Get to knowSpring FrameworkThe Core Spring Module: Defining Beans and Dependency InjectionTopics:Setting bean properties
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  Supplying constructor arguments
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  Using factory methods
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  Dependency injection
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  Supplying other beansas properties or constructor argsGet to know Spring FrameworkSpring Hello World: What will we do?• Code a plain Java class model– Use the interface pattern by coding a HelloWorld interface and a HelloWorldImpl implementation• Configure the Spring IoC container• Instantiate the Spring IoC container• Acquire the object from the Spring IoC container– The client must only have knowledge of the interface, HelloWorld
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  Get to knowSpring FrameworkSpring Hello World: Create POJOCreate a interface HelloWorldpublic interface HelloWorld { public void execute();}Create an implementing class HelloWorldImplpublic class HelloWorldImpl implements HelloWorld { public void execute() {System.out.println("Hello World!"); }}
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  Get to knowSpring FrameworkSpring Hello World: Spring IOC Configuration<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsd"><bean id="helloWorld"class="HelloWorldImpl" /></beans>
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  Get to knowSpring FrameworkSpring Hello World: Executeimport org.springframework.beans.factory.*;import org.springframework.context.support.*;public class Main{public static void main(String[] args) { BeanFactorybeanFactory = new ClassPathXmlApplicationContext("applicationContext.xml");HelloWorldhelloWorld = (HelloWorld) beanFactory.getBean("helloWorld");helloWorld.execute();}}
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  Get to knowSpring FrameworkSpring Hello World: OutputRun the main class and you shall see “Hello World” printed.
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  Spring Referencehttp://www.springsource.org/
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  Top-level documentation pagehttp://www.springframework.org/documentation• Wiki http://opensource.atlassian.com/confluence/spring• Forum http://forum.springframework.org• Books Spring Recipes. APress 2008 Spring in Action. Manning 2007 Agile Java Development with Spring, Hibernate andGet to know Spring Framework