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![// import org.springframework.web.bind.annotation.Controller
// other imports ...
// @Grab("org.springframework.boot:spring-boot-starter-web:0.5.0")
// @EnableAutoConfiguration
@Controller
class Example {
@RequestMapping("/")
@ResponseBody
public String hello() {
return "Hello World!";
}
// public static void main(String[] args) {
// SpringApplication.run(Example.class, args);
// }
}
What Just Happened ?](https://image.slidesharecdn.com/springboot-ppt-160725071652/75/Spring-boot-Introduction-7-2048.jpg)
Uploaded byJeevesh Pandey
Spring boot Introduction
The document provides an overview of Spring Boot, detailing its key features such as rapid prototyping, dependency management, and production-ready capabilities without the need for extensive configuration. It highlights the framework's ease of use, the support for various build tools like Gradle and Maven, and its integration with Spring Data libraries. Additionally, examples of setting up applications, managing profiles, and utilizing built-in features such as security and health checks are discussed.
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Spring boot Introduction
- 1. Spring Boot - ByJeevesh Pandey
- 2. • What andWhy? • Key features of Spring boot. • Prototyping using CLI. • Working with Spring Boot with gradle. • Packaging Executable Jars / Fat jars • Managing profiles • Binding Properties - Configurations • Using Spring data libraries • Presentation layer(A glimpse) • Miscellaneous Agenda
- 3. • Spring-boot providesa quick way to create a Spring based application from dependency management to convention over configuration. • It’s not a replacement for Spring framework but it presents a small surface area for users to approach and extract value from the rest of Spring. • To provide a range of non-functional features that are common to large classes of projects (e.g. embedded servers, security, metrics, health checks, externalized configuration) • Grails 3.0 will be based on Spring Boot. 3 What and Why ?
- 4. • Stand-alone Springapplications with negligible efforts. • No code generation and no requirement for XML Config • Automatic configuration by creating sensible defaults • Provides Starter dependencies / Starter POMs. • Structure your code as you like • Supports Gradle and Maven • Provides common non-functional production ready features for a “Real” application such as – security – metrics – health checks – externalised configuration Key Features
- 5. • Quickest wayto get a spring app off the ground • Allows you to run groovy scripts without much boilerplate code • Not recommended for production Install using SDK $ sdk install springboot Running groovy scripts $ spring run app.groovy $ spring jar test.jar app.groovy Rapid Prototyping : Spring CLI
- 6. @Controller class Example { @RequestMapping("/") @ResponseBody publicString helloWorld() { "Hello Spring boot audience!!!" } } Getting Started Quickly using CLI
- 7. // import org.springframework.web.bind.annotation.Controller //other imports ... // @Grab("org.springframework.boot:spring-boot-starter-web:0.5.0") // @EnableAutoConfiguration @Controller class Example { @RequestMapping("/") @ResponseBody public String hello() { return "Hello World!"; } // public static void main(String[] args) { // SpringApplication.run(Example.class, args); // } } What Just Happened ?
- 8. One-stop-shop forall the Spring and related technology A set of convenient dependency descriptors Contain a lot of the dependencies that you need to get a project up and running quickly All starters follow a similar naming pattern; spring-boot-starter-* Examples spring-boot-starter-web(tomcat and spring mvc dependencies) – spring-boot-starter-actuator – spring-boot-starter-security – spring-boot-starter-data-rest – spring-boot-starter-amqp – spring-boot-starter-data-jpa – spring-boot-starter-data-elasticsearch – spring-boot-starter-data-mongodb Starter POMs
- 9. @Grab('spring-boot-starter-security') @Grab('spring-boot-starter-actuator') @Grab('spring-boot-starter-jetty') @Controller class Example { @RequestMapping("/") @ResponseBody publicString helloWorld() { return "Hello Audience!!!" } } //security.user.name //security.user.password //actuator endpoints: /beans, /health, /mappings, /metrics etc. Demo : Starter POM
- 10. Spring Initializer ● UsingIntellij Idea Spring initializer ● Using start.spring.io https://start.spring.io/
- 11. apply plugin: 'groovy' applyplugin: 'java' apply plugin: 'idea' apply plugin: 'spring-boot' buildscript { repositories { mavenCentral()} dependencies { classpath("org.springframework.boot:spring-boot-gradle-plugin:1.1.8.RELEASE") classpath 'org.springframework:springloaded:1.2.0.RELEASE' } } repositories { mavenCentral() } dependencies { compile 'org.codehaus.groovy:groovy-all' compile 'org.springframework.boot:spring-boot-starter-web' } Generated Gradle Build Script
- 12. 12 $ gradle build $java -jar build/libs/mymodule-0.0.1-SNAPSHOT.jar Build and Deploy
- 13. • Put application.properties/application.ymlsomewhere in classpath • Easy one: src/main/resources folder 13 app: name: Springboot+Config+Yml+Demo version: 1.0.0 server: port: 8080 settings: counter: 1 --- spring: profiles: development server: port: 9001 app.name=Springboot+Config+Demo app.version=1.0.0 server.port=8080 settings.counter=1 application.properties app.name=Springboot+Config+D emo app.version=1.0.0 server.port=8080 application-dev.properties Environments and Profiles application.properties
- 14. 14 export SPRING_PROFILES_ACTIVE=development export SERVER_PORT=8090 gradlebootRun java -jar build/libs/demo-1.0.0.jar java -jar -Dspring.profiles.active=development build/libs/dem-1.0.0.jar java -jar -Dserver.port=8090 build/libs/demo-1.0.0.jar OS env variable with a -D argument (JVM Argument) Examples
- 15. 15AQA1 import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.stereotype.Component; @Component @ConfigurationProperties(prefix= "app") public class AppInfo { private String name; private String version; } Using ConfigurationProperties annotation import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component public class AppConfig { @Value('${app.name}') private String appName; @Value('${server.port}') private Integer port; } Using Value annotation Binding Properties
- 17. Using Spring data:MySQL •Add dependency • Configure database URL compile 'mysql:mysql-connector-java:5.1.6' compile 'org.springframework.boot:spring-boot-starter-jdbc' compile 'org.springframework.boot:spring-boot-starter-data-jpa' spring.datasource.url= jdbc:mysql://localhost/springboot spring.datasource.username=root spring.datasource.password=root spring.datasource.driverClassName=com.mysql.jdbc.Driver spring.jpa.hibernate.ddl-auto=create-drop
- 18. • • Entity class • importjavax.persistence.*; @Entity public class User{ @Id private Long id; private String name; //Getter and Setter } Using Spring data:MySQL
- 19. • • Add repositoryinterface import org.springframework.data.jpa.repository.JpaRepository; public interface UserRepository extends JpaRepository<User, Long>{ User findByName(String name); } • Usage @Autowired private UserRepository userRepository; userRepository.findByName(); userRepository.save(); userRepository.findAll(); For more : http://www.oracle.com/technetwork/middleware/ias/toplink-jpa-annotations- 096251.html
- 20. View templates libraries(A Glimpse) •JSP/JSTL • Thymeleaf • Freemarker • Velocity • Tiles • GSP • Groovy Template Engine 20
- 21. Logging $ java -jarmyapp.jar --debug logging.level.*: DEBUG_LEVEL E.g. logging.level.intellimeet: ERROR
- 22. Actuator for Production IDDescription Sensitiv e autoconfig Displays an auto-configuration report showing all auto- configuration candidates and the reason why they ‘were’ or ‘were not’ applied. true beans Displays a complete list of all the Spring beans in your application. true configprops Displays a collated list of all @ConfigurationProperties. true dump Performs a thread dump. true env Exposes properties from Spring’s ConfigurableEnvironment. true health Shows application health information (a simple ‘status’ when accessed over an unauthenticated connection or full message details when authenticated). false info Displays arbitrary application info. false metrics Shows ‘metrics’ information for the current application. true mappings Displays a collated list of all @RequestMapping paths. true shutdown Allows the application to be gracefully shutdown (not enabled by default). true trace Displays trace information (by default the last few HTTP requests). true
- 23. Miscellaneous - Enabling Disablingthe Banner - Changing the Banner (http://www.kammerl.de/ascii/AsciiSignature.php) - Adding event Listeners - Logging startup info
- 25.