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Spring forward: an introduction to Spring boot and Thymeleaf
The document provides an introduction to Spring Boot and Thymeleaf, detailing their functions as a framework for building Java applications and a template engine, respectively. It covers their features, installation, syntax, and security integration, along with resources for further learning. Additionally, it examines their similarities and differences, particularly in configuration and deployment capabilities.
Spring forward: an introduction to Spring boot and Thymeleaf
- 1. #engageug Spring forward: anintroduction to Spring boot and Thymeleaf Frank van der Linden, elstar IT Full stack Developer 1 Engage 2018
- 2. #engageug Me • Freelance Fullstack Java developer • Owner of elstar IT • Curious of new technology • IBM Champion 2013, 2014, 2017 and 2018 2
- 3. #engageug How to proceed •What is Spring boot and Thymeleaf • Similarities and differences • Runs everywhere • How to start • Syntax • Security • New possibilities 3
- 4. #engageug What is Springboot and Thymeleaf 4
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- 6. #engageug Spring boot • Opensource, Pivotal is coordinating. • Spring boot creates Spring (Java) based applications • Embedded Tomcat makes it ‘just’ run everywhere • Auto configure as much as possible • Built in metrics and health checks • Easy to configure with YAML or property file • Very good documentation and code examples • Fast creation of REST api’s 6
- 7. #engageug Thymeleaf • Is atemplate engine • Based on Java and HTML5 • Very strict, or template will break • Full Spring framework support • Extensible with dialects • Full (and extensible) internationalisation support. • Reusable fragments, like of Custom Controls • Extensive documentation 7
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- 9. #engageug 9 XPages SpringBoot/Thymeleaf Configure Faces-config @Autowired Endpoints Need work or SmartNSF very strong support Security Built-in Need Spring Security Add-ons Lots of 3rd party add-on Thanks to OpenNTF Lots of 3rd party add-on Deployment Runs on Domino Runs everwhere Build Pain of the Domino Designer Maven/Gradle build out-of-the box IDE DDE (Windows) for OSGi plugins almost every IDE Almost every IDE, like Netbeans, Eclipse, IntelliJ and more (Windows, Linux, MacOS)
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- 11. #engageug Runs everywhere • WithEmbedded Tomcat as default the jar ‘just run’ • More choices of embedded web server, in the future also OpenLiberty • Will run on Docker • Will run on Cloud Foundry, like IBM Cloud or Pivotal on Azure • Tomcat can by excluding to run it on Websphere Application Server, Tomcat or WildFly (a.k.a JBoss) 11
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- 13. #engageug How to start •Install Gradle or Maven • Move over to start.spring.io • Or use the Starter in IntelliJ • Fill all the fields and select the required projects (full version) • Generate project • Download zip, unzip and add to Git repository. • Open project in favourite IDE, run ‘mvn clean install’ • Start coding 13
- 14. #engageug 14 Wizard inIntelliJ
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- 17. #engageug How it workstogether 17
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- 19. #engageug Spring boot syntax 19 endpointto return an object as JSON endpoint to return a thymeleaf template
- 20. #engageug Component scan • Componentscan will scan all the packages for @Service, @Controller, @Repository and more @Component(s) • @Autowired will glue everything together 20
- 21. #engageug Thymeleaf syntax • Includethe th namespace to the page • Every html element attribute has a th:…. Equivalent. • Variable Expressions: ${...} • Selection Variable Expressions: *{...} • Message Expressions: #{...} • Link URL Expressions: @{...} 21
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- 27. #engageug Link URL Expressions 27 resourcelinks links in on a page
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- 30. #engageug Fragments (2) 30 fragment code useit multiple times
- 31. #engageug Attachments • Forget theUploadedFile, learn MultipartFile • MultipartFile has lots of similarities with UploadedFile, but easier to use. Less code to achieve the same 31
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- 33. #engageug Spring Security • Frameworkfor Authentication and Authorisation • Prevention of clickjacking, CORS, cross site request forgery • Integrates with Spring Boot and Thymeleaf • Customisable • Support for Basic Authentication, SAML2, oAuth and more. 33
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- 35. #engageug Spring security inThymeleaf 35 add to pom.xml add namespace
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- 37. #engageug Lombok • Forget Gettersand Setters • Forget toString, hashCode and equals • One @Annotations rules the all (@Data or @Getter and @Setter) • Add logging by @annotations (@Log4j2 or @Slf4j) 37
- 38. #engageug Lombok 38 add to pom.xml add@Data using the build in logging
- 39. #engageug Swagger • Part ofOpen API Specification, since v3 • Documentation of API’s • Playground for testing • Add annotation to generate the documentation dynamically 39
- 40. #engageug Swagger 40 add to pom.xml adda configuration add annotation to endpoint
- 41. #engageug Jenkins • With Jenkinsyou can build automatically the application • …But also do quality control, do load tests and even deploy. • JenkinsFile should be in the root of the GIT Repository • Groovy is the language for JenkinsFile 41
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- 44. #engageug Resources • Spring Initializr •http://start.spring.io/ • Thymeleaf documentation • http://www.thymeleaf.org/ • Spring Boot • https://projects.spring.io/spring-boot/ • Lombok • https://projectlombok.org/ • Jenkins • https://jenkins.io/ 44
- 45. #engageug Resources • Swagger • http://swagger.io •Thymeleaf documentation • http://www.thymeleaf.org/ • Maven • https://maven.apache.org/ • Gradle • https://gradle.org/ • Spring Forward Starter • https://bitbucket.org/flinden68/spring-forward-starter 45
- 46. #engageug Reach out tome • @flinden68 • http://www.elstarit.nl • flinden68@elstarit.nl • https://nl.linkedin.com/in/flinden68 46