Spring 1 day program
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This document provides an overview of the Spring Framework including: - What Spring is and its benefits such as infrastructure focused development and aspects. - Key Spring concepts like dependency injection, the IOC container, and aspect oriented programming. - The Spring architecture including Spring beans and various Spring projects. - How to get started with Spring Boot and its features for creating stand-alone applications. - Examples of using Spring for web applications, transactions, and testing.
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Spring 1 day program
- 1. Simple, Portable, Fast and Flexible By Mohit Kanwar
- 2. Foreword This a basic introduction to Spring Framework and niche technologies To understand technical aspects it is recommended to have prior knowledge of Java Maven SDLC Non-Functional Requirements Git Make this discussion yours : peer to peer learning
- 3. Overview Introduction to Spring Working with Spring Spring Boot Spring Security Spring Test
- 5. Overview What is Spring? 1 Whats in it for me? 2 Basic Concepts •Dependency Injection •IOC Container •Aspect Oriented Programming 3 Spring Architecture •Spring Beans 4 Other Spring Projects 5
- 6. What is Spring Spring is • An Application Development Framework • Inversion of Control Container • Open Source • Alternate to Enterprise Java Beans Spring Allows us • To create an HTTP endpoint, without dealing with servlet API • To Focus on functionality of a method, without having to deal with transactions API
- 7. What’s in it for me? Infrastructure Focused Development Aspects Open Source Existing Technologies Automation Testing Fast Modular Huge Community Independent of Container Easy to understand Transactional Reliable Configurable Extensible Secure Customizable Cost Effective Lightweight
- 8. Dependency Injection An Implementation of Factory Design Pattern What to instantiate? Builder Design Pattern How to instantiate? Service Locator Design Pattern Where to find it?
- 9. Dependency Injection It is at the heart of Spring It helps keeping our classes as independent as possible Increases reuse by applying low coupling Easy testing Readable Passes the dependency (a service) to a dependent object (a client) rather than allowing a client to build or find the service
- 10. IOC Container The container gets its instructions on what objects to instantiate, configure and assemble by reading configuration metadata provided. The configuration metadata can be represented either by XML Java annotations Java code
- 11. Spring Beans singleton A single instance per Spring IoC container (default). prototype New Instance whenever requested request Once every HTTP request session Once per HTTP Session. global- session Once per global HTTP Session Spring beans are The objects that form the backbone of an application Managed by Spring IOC Container Scope
- 12. Dependency Injection XML Config Foo f = new Foo("Cleopatra"); Bar b = new Bar("Arthur",26); b.setFoo(f);
- 13. Aspect Oriented Programming Accounts Business Logic Persistence Security Logging Users Business Logic Persistence Security Logging Bill Payment Business Logic Persistence Security Logging Location Finder Business Logic Persistence Security Logging Non AOP
- 14. Aspect Oriented Programming Accounts Business Logic Users Business Logic Bill Payment Business Logic Location Finder Business Logic AOP PersistenceSecurityLogging Caching
- 15. Aspect Oriented Programming @Before – Run before the method execution @After – Run after the method returned a result @AfterReturning – Run after the method returned a result, intercept the returned result as well. @Around – Run around the method execution, combine all three advices above. @AfterThrowing – Run after the method throws an exception Pointcut (AspectJ Pointcut Expression Language) Join Point Advice
- 17. Typical Full Fledged Web Application Custom Domain Logic Aspects Web Views APIs Persistence Models Notifications Remote Automation Testing
- 19. Various Spring Projects Spring-Boot Spring-Batch Spring- Security Spring- Framework Spring-Cloud Spring- Integration
- 20. Summary What is Spring? 1 Whats in it for me? 2 Basic Concepts •Dependency Injection •IOC Container •Aspect Oriented Programming 3 Spring Architecture •Spring Beans 4 Other Spring Projects 5
- 21. Spring Boot
- 22. Spring Boot Spring Boot is a brand new framework from the team at Pivotal, designed to simplify the bootstrapping and development of a new Spring application. The framework takes an opinionated approach to configuration, freeing developers from the need to define boilerplate configuration. Features Create stand-alone Spring applications Embed Tomcat, Jetty or Undertow directly (no need to deploy WAR files) Provide opinionated 'starter' POMs to simplify your Maven configuration Automatically configure Spring whenever possible Provide production-ready features such as metrics, health checks and externalized configuration Absolutely no code generation and no requirement for XML configuration
- 24. Overview Setting up workspace 1 Hello World in Spring 2 Spring Web- MVC 3 Spring Transactions 4 Aspects 5
- 25. My First Spring Based Application Creating Environment Choosing dependencies Setting it all up!
- 26. Spring Boot it Up Spring Initializr https://start.spring.io/
- 27. Demo
- 28. Hello World! My first Rest API using Spring
- 29. Spring Boot Maven Plugin Uber Jar • It collects all the jars on the classpath and builds a single, runnable "über-jar", which makes it more convenient to execute and transport your service. Runnable Class • It searches for the public static void main() method to flag as a runnable class. Dependency Resolver • It provides a built-in dependency resolver that sets the version number to match Spring Boot dependencies. You can override any version you wish, but it will default to Boot’s chosen set of versions.
- 30. Automation Test
- 31. @Autowired Helps finding a desired implementation spring bean Inject its instance Get rid of new keyword Implementations can be injected at runtime instead of compile time.
- 32. Hello World Controller • Makes the class a Spring Aware MVC Controller @Controller • Map a HTTP request method to Bean method @RequestMapping • Sets the returned value from method as the HTTP response body @ResponseBody
- 33. Spring Boot Starter @SpringBootApplication @Configuration @EnableAutoConfiguration @ComponentScan
- 34. Build and Run the Jar mvn clean install java -jar target/demo-0.0.1-SNAPSHOT.jar Test http://localhost:8080/
- 35. Hello Web! Understanding MVC Architecture Understanding Templates First Spring based web-app
- 36. MVC Architecture
- 38. The DispatcherServlet The Spring Web model-view-controller (MVC) framework is designed around a DispatcherServlet that handles all the HTTP requests and responses.
- 39. Spring boot Devtools Enable hot swapping Switches template engines to disable caching Enables LiveReload to refresh browser automatically Other reasonable defaults based on development instead of production
- 41. Transactions!
- 42. Transaction A transaction is a set of instructions which are treated as a single unit of work They should complete entirely or nothing Atomicity • Single unit of operation • It should either be complete or not at all • No middle state Consistency • Consistency of referential integrity Isolation • Each transaction must be isolated from others Durability • Changes are stored permanently • Must not be erased due to system failure
- 43. Transaction Commit and Rollback State 1 Step 1 Step 2 Step 3 State 2 Commit State 1 Rollback State after Transaction Ends Error
- 44. Aspects!
- 45. Important Definitions Aspects Cross cutting concerns of an application e.g. Logging, Transaction Management Join Point A point where an aspect is expected Advice Action taken at particular Join Point Pointcut Determine weather an advice is to be executed at a Join Point
- 46. Spring Security
- 47. Spring Security Spring Security is a framework that focuses on providing both authentication and authorization to Java Applications Features Comprehensive and extensible support for both Authentication and Authorization Protection against attacks like session fixation, clickjacking, CSRF etc Servlet API integration Optional integration with Spring Web MVC
- 49. Spring Test
- 50. Spring Test Spring Test Framework supports Unit testing with mock objects IOC container to create dependencies for integration testing Transaction management for integration testing Third party frameworks like Junit TestNG Mockito
- 51. References https://docs.spring.io/spring/docs/current/spring-framework-reference/html/overview- getting-started-with-spring.html http://mohitkanwar.com/blog/2016/03/12/spring.html https://en.wikipedia.org/wiki/Spring_Framework https://spring.io/guides/gs/managing-transactions/ https://docs.spring.io/spring/docs/current/spring-framework-reference/html/aop.html https://www.mkyong.com/spring/spring-aop-examples-advice/ https://dzone.com/articles/aspect-oriented-programming-with-springboot http://www.tutorialspoint.com/spring/spring_bean_scopes.htm https://docs.spring.io/spring- boot/docs/current/api/org/springframework/boot/test/context/SpringBootTest.html http://projects.spring.io/spring-security/ http://www.mkyong.com/tutorials/spring-mvc-tutorials/ http://www.mkyong.com/tutorials/spring-security-tutorials/ http://www.slideshare.net/rstoya05/testing-web-apps-with-spring-framework-32 http://www.petrikainulainen.net/programming/spring-framework/integration-testing-of- spring-mvc-applications-security/
- 52. Further reading S.No Title Resource 1 War Packaging https://docs.spring.io/spring- boot/docs/current/reference/htmlsingle/#buil d-tool-plugins-maven-packaging 2 Getting Started https://docs.spring.io/spring/docs/current/spr ing-framework-reference/html/overview- getting-started-with-spring.html 3 Testing with non- default options https://spring.io/guides/gs/testing-web/ 4 Spring Security https://spring.io/guides/tutorials/spring- security-and-angular-js/ 6 Annotations http://www.tutorialspoint.com/spring/spring_ autowired_annotation.htm 7 DevTools http://docs.spring.io/spring- boot/docs/current/reference/html/using- boot-devtools.html
- 53. About Me Mohit Kanwar Email : m.m.kanwar@gmail.com Social https://www.linkedin.com/in/mohit-kanwar-7668a211/ https://github.com/mohitkanwar https://www.slideshare.net/mohitkanwar1 Blog http://mohitkanwar.com
Editor's Notes
- Started as an alternate to EJBs Reducing complexity Improving performance POJO Based Independence from Containers XML Based Project Configurations Configurations defined in XML Annotation based Project Configurations Independence from XML Spring Boot Automatic Configurations
- Spring handles the infrastructure so you can focus on your application.
- At this point you like to add Caching. What changes are required?
- http://mohitkanwar.com/blog/2016/03/12/spring.html
- http://mohitkanwar.com/blog/2016/03/12/spring.html