Spring Boot Introduction and framework.ppt

Spring Boot Introduction
Spring MVC, Spring Data
Spring Boot
Introduction

Table of Contents
1. Spring Boot Components
2. Spring MVC
3. Spring Data
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sli.do
#JavaWeb
Have a Question?

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 Opinionated view of building production-ready Spring
applications
Spring Boot
Spring Boot
Tomcat
pom.xml
Auto configuration

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 Just go to https://start.spring.io/
Creating Spring Boot Project

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 Additional set of tools that can make the application
development faster and more enjoyable
Spring Dev Tools
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
pom.xml

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Spring Resources
HTML, CSS, JS
Thymeleaf
App propertues

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 Four main components:
 Spring Boot Starters - combine a group of common or related
dependencies into single dependency
 Spring Boot AutoConfigurator - reduce the Spring Configuration
 Spring Boot CLI - run and test Spring Boot
applications from command prompt
 Spring Boot Actuator – provides EndPoints and
Metrics
Spring Boot Main Components

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Spring Boot Starters (1)
<dependency>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.4.1.RELEASE</version>
</dependency>
pom.xml

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Spring Boot Starters (2)
spring-boot-starter-web
spring-web spring-web-mvc
spring-boot-starter
spring-boot-starter-tomcat
tomcat-embed-core
tomcat-embed-logging-juli
spring-boot
spring-boot-autoconfigure
spring-boot-starter-logging

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Spring Boot AutoConfigurator
@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@SpringBootConfiguration
@EnableAutoConfiguration
@ComponentScan(
excludeFilters = {@Filter(
type = FilterType.CUSTOM,
classes = {TypeExcludeFilter.class}
)}
)
public @interface SpringBootApplication
pom.xml

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 Command Line Interface - Spring Boot software to run and test
Spring Boot applications
Spring Boot CLI

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 Expose different types of information about the running
application
Spring Boot Actuator
<dependency>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
pom.xml

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 Spring provides Inversion of Control and Dependency Injection
Inversion of Control
//Tradiotional Way
public class UserServiceImpl
implements UserService {
private UserRepository
userRepository = new
UserRepository();
}
UserServiceImpl.java
//Dependency Injection
@Service
public class UserServiceImpl
implements UserService {
@Autowired
private UserRepository
userRepository;
}
UserServiceImpl.java

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Spring IoC
Meta Data:
1. XML Config
2. Java Config
3. Annotation Config
Automatic Beans:
1. @Component
2. @Service
3. @Repository
Fully Configured System
Explicit Beans
1. @Bean
IoC

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 Object that is instantiated, assembled, and otherwise managed
by a Spring IoC container
Beans
public class Dog implements Animal {
private String name;
public Dog() {}
//GETTERS AND SETTERS
}
Dog.java

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Bean Declaration
@SpringBootApplication
public class MainApplication {
…
@Bean
public Animal getDog(){
return new Dog();
}
}
Dog.java
Bean Declaration

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Get Bean from Application Context
public static void main(String[] args) {
ApplicationContext context =
SpringApplication.run(MainApplication.class, args);
Animal dog = context.getBean(Dog.class);
System.out.println("DOG: " +
dog.getClass().getSimpleName());
}
}
MainApplication.java

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Bean Lifecycle
Instantiation Set Properties Set Name
Set Application
Context
Pre Initialization
Initialization
Post Initialization Bean is ready Bean is destroyed
When Container
is Shutdown

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Bean Lifecycle Demo (1)
public static void main(String[] args) {
ApplicationContext context =
SpringApplication.run(MainApplication.class, args);
((AbstractApplicationContext)context).close();
}
@Bean(destroyMethod = "destroy", initMethod =
"init")
public Animal getDog(){
return new Dog();

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Bean Lifecycle Demo (2)
public class Dog implements Animal {
public Dog() {
System.out.println("Instantiation");
}
public void init(){
System.out.println("Initializing..");
}
public void destroy(){
System.out.println("Destroying..");
}
}

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 The default one is Singleton. It is easy to change to Prototype
Bean Scope
Request A
Request B
Request C
Request A
Request B
Request C
Dog
Dog 1
Dog 2
Dog 3
Singleton Prototype
Mostly used
as State-full
Mostly used
as State-less

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Execute
Action
 Model-view-controller (MVC) framework is designed around a
DispatcherServlet that dispatches requests to handlers
What is Spring MVC?
Dispatcher
Servlet
Handler
Mapping
Handler
Adapter
View
Resolver
Controller
View Name
Model
View
Service
Repository
DB
Request
Find
Controller
Resolve
View
Result
Model
Result
Model
Business Logic
Response

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Response
(html, json, xml)
MVC – Control Flow
Web Client
Model
Controller
View
Request
User Action
Update
Model
Notify
Update
View

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Controllers
@Controller
public class DogController {
@GetMapping("/dog")
@ResponseBody
public String getDogHomePage(){
return "I am a dog page";
}
}
DogController.java
Controller
Request Mapping
Action
Text
Print Text

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Actions – Get Requests
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@Controller
public class CatController {
@GetMapping("/cat")
public String getHomeCatPage(){
return "cat-page.html";
}
}
CatController.java
Request Mapping
Action
View

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Actions – Post Requests (1)
@Controller
@RequestMapping("/cat")
@GetMapping("")
public String getHomeCatPage(){
return "new-cat.html";
}
}
CatController.java
Starting route

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Actions – Post Requests (1)
@Controller
@PostMapping("")
public String addCat(@RequestParam String catName,
@RequestParam int catAge){
System.out.println(String.format("Cat Name: %s,
Cat Age: %d", catName, catAge));
return "redirect:/cat";
}
}
CatController.java
Request param
Redirect

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Models and Views
@Controller
public class DogController {
@GetMapping("/dog")
public ModelAndView getDogHomePage(ModelAndView
modelAndView){
modelAndView.setViewName("dog-page.html");
return modelAndView;
}
}
DogController.java
Model and View

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Path Variables
@Controller
@GetMapping("/edit/{catId}")
@ResponseBody
public String editCat(@PathVariable long catId){
return String.valueOf(catId);
}
}
CatController.java
Path Variable

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Overall Architecture
Database
Repository Service
Models/
DTO
Controller
Entities
View
Back-end

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Application Properties
#Data Source Properties
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/cat_store?
useSSL=false&createDatabaseIfNotExist=true
spring.datasource.username=root
spring.datasource.password=1234
#JPA Properties
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect
.MySQL5InnoDBDialect
spring.jpa.properties.hibernate.format_sql=TRUE
spring.jpa.hibernate.ddl-auto=update
application.properties

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 Entity is a lightweight persistence domain object
Entities
@Entity
@Table(name = "cats")
public class Cat {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
private String name;
//GETTERS AND SETTERS
}
Cat.java

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 Persistence layer that works with entities
Repositories
@Repository
public interface CatRepository extends CrudRepository<Cat, Long>
{
}
CatRepository.java

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 Business Layer. All the business logic is here.
Services
@Service
public class CatServiceImpl implements CatService {
@Autowired
private CatRepository catRepository;
@Override
public void buyCat(CatModel catModel) {
//TODO Implement the method
}
}
CatService.java

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 Spring Boot - Opinionated view of building
production-ready Spring applications
 Spring MVC - MVC framework that has three
main components:
 Controller - controls the application flow
 View - presentation layer
 Model - data component with the main logic
 Spring Data - Responsible for database related
operations
Summary

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Questions?
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License
 This course (slides, examples, demos, videos, homework, etc.)
is licensed under the "Creative Commons
Attribution-NonCommercial-ShareAlike 4.0 International"
license
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