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Introducing spring
Spring Framework provides a comprehensive infrastructure to develop Java applications. It handles dependency injection and inversion of control so developers can focus on domain logic rather than plumbing. Spring promotes best practices like clean code, test-driven development, and design patterns. It includes aspects for cross-cutting concerns and supports web development through frameworks like Spring MVC. The document introduces Spring's lightweight and modular IoC container and AOP capabilities for separating concerns.
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Introducing spring
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- 4. “I’m not agreat programmer, I’m just a good programmer with great habits.” Kent Beck
- 5. Our toolbox • Clean code • TDD • Design patters • Frameworks • ...
- 6. Clean code Source codeare for humans not computers! “Code Smells”, Martin Fowler
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- 12. The Spring Framework •Best practices • Proven Solutions • OpenSource • Continuously growing
- 13. Spring Ecosystem Spring MVC Spring WebFlow Spring Dynamic Spring ROO Modules Spring Web Spring Security Services Spring Framework Spring Spring Batch Integration Spring Data Spring Social Spring Android And many more...
- 14. In a Nutshell •IoC container • Lightweight • Comprehensive coverage of AOP • TDD • Modular
- 15. Where? • Junit systemTest • Java EE web application • Java EE enterprise application • Standalone Java application
- 16. What? Spring Framework providescomprehensive infrastructure support for developing Java applications. −Spring deals with the plumbing −So you can focus on solving the domain problem.
- 17. And that means... Youcan build applications from “plain old Java objects” (POJOs) and to apply enterprise services non-invasively to POJOs.
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- 19. Inversion of Control(IoC) “Is a programming technique, in which object coupling is bound at run time by an assembler object and is typically not known at compile time using static analysis.”
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- 21. Spring Triangle As p n ec io t-O ct je rie In nt y nc ed Simple de Pr n og pe Object ra De m m in g Enterprise Service Abstractions
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- 23. Unit Test Stub / Mock
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- 25. Deployments Development Test QA Production or + + + Mocks Dummy data Dump real data Real data
- 26. Dependency Injection (IoC) • XML • Annotations • Java
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- 29. XML app-config.xml
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- 32. XML app-config.xml
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- 34. Java Configuration Defined outside !!
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- 36. Aspect-Oriented Programming “AOP isa programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns”
- 37. Cross-Cutting Concerns? Generic funcionalitythat is needed in many places in your application − Security − Caching − Logging − ...
- 38. Tangling Mixing of concerns
- 39. Scattering Duplication
- 40. How? AOP <<Interface>> TransferService TransferServiceImpl (Target) Spring AOP Proxy transfer(300,1,2) Aspect Target ExceptionReporterAdvice (Aspect)
- 41. With Spring AOP TransferServiceImpl.java TransferServiceImpl.java ExceptionReporterAdvice.java ExceptionReporterAdvice.java <beans> <aop:aspectj-autoproxy> <aop:include name=“exceptionReporter” /> </aop:aspectj-autoproxy> <bean id=“exceptionReporter” class=“...ExceptionReporterAdvice” /> </beans> Spring-aop.xml Spring-aop.xml
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- 44. Spring Web Integration •Spring provides support in the Web layer − Spring MVC, Spring WebFlow, … • However, you are free to use Spring with any Java web framework − Struts,Tapestry, JSF, WebWork, Wicket, ...
- 45. web.xml <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/spring/app-config.xml </param-value> </context-param> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener>
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- 47. Model - View- Controller
- 48. Spring MVC @Controller BlazeDS (Flex) WebFlow request ... HandlerMapping HandlerMapping DispatcherServlet Handler HandlerAdapter HandlerAdapter response model + View render(model) JSP View JSP PDF Excel ... ViewResolver ViewResolver
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- 50. Quick Start 1. Deploya Dispatcher Servlet 2. Implement a request Handler (Controller) 3. Implement the View 4. Register the Controller 5. Deploy and Test
- 51. Deploy Dispatcher Servlet web.xml <servlet> <servlet-name>dispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/spring/mvc-config.xml </param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>dispatcherServlet</servlet-name> <url-pattern>/app/*</url-pattern> </servlet-mapping> Don't forget ContextLoaderListener (app-config.xml)
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- 53. Register Controller <beans> <bean class=”org.spf.web...InternalResourceViewResolver”> <property name=”prefix” value=”/WEB-INF/views/” /> <property name=”suffix” value=”.jsp” /> </bean> <bean class=”com.extrema...TransferController” /> </beans> /WEB-INF/spring/mvc-config.xml
- 54. Implement View <html> <head><title>Yourtransfer</title></head> <body> <h1>Your transfer </h1> Id = ${transfer.id} <br/> Date = ${transfer.date} <br/> Amount = ${transfer.amount} <br/> Credit = ${transfer.credit} <br/> Debit = ${transfer.debit} <br/> </body> </html> /WEB-INF/views/transfer.jsp
- 55. Deploy and Test http://localhost:8080/app/transfer/1 Your transfer Id = 1 Date = 2013/01/01 Amount = 300.0 Credit = 1234 Debit = 5678
- 56. … and muchmore • Stateless converter for binding and formatting • Support for JSR-303 declarative validation • I18n • Themes • Content Negotiation • Support for RESTful web services • WebFlow
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- 58. Conclusions • Developing softwareis a craft. • We need tools to help us in the process. −Good practices −Frameworks • It depends on you to choose the right one for your needs. • Spring is just one of them.
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- 60. Ernesto Hernández @ehdez73