Springboot

Springboot

  • Mahalakshmi
    Teacher
    Mahalakshmi
  • Category
    Nellie Hodkiewicz
  • Review
    • (20 Reviws)
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Course Summery

Spring Boot Essentials

Requrements

Springboot Lecture Started

Introduction to Spring Boot

  1. What is Spring Boot?
  2. Why use Spring Boot?
  3. Features and advantages

Setting Up Development Environment

  1. Installing Java Development Kit (JDK)
  2. Setting up Integrated Development Environment (IDE) like IntelliJ IDEA or Eclipse
  3. Installing Maven or Gradle

Creating a Simple Spring Boot Application

  1. Setting up a new project
  2. Understanding project structure
  3. Creating a basic "Hello World" RESTful service

Dependency Injection and Configuration

  1. Understanding dependency injection in Spring
  2. Using annotations like @Autowired
  3. Bean configuration and scopes

RESTful Web Services

  1. Building RESTful APIs with Spring MVC
  2. Handling HTTP requests (GET, POST, PUT, DELETE)
  3. Request and response body handling

Data Access with Spring Data

  1. Integrating Spring Data JPA for database access
  2. Creating and configuring repositories
  3. Performing CRUD operations

Error Handling and Validation

  1. Handling exceptions in Spring Boot
  2. Using @ExceptionHandler
  3. Validating input data with @Valid and @RequestBody

 

Security

  1. Introduction to Spring Security
  2. Securing RESTful endpoints
  3. Authentication and authorization

Testing

  1. Writing unit tests with JUnit and Mockito
  2. Integration testing with Spring Boot Test

Deployment

  1. Packaging the application as a JAR file
  2. Deploying to a local server (like Tomcat)
  3. Deploying to a cloud platform (like AWS or Heroku)

Monitoring and Management

  1. Using Spring Boot Actuator for monitoring and management
  2. Monitoring application health, metrics, and endpoints

Advanced Topics (Optional)

  1. Microservices architecture with Spring Boot
  2. Spring Boot profiles and configuration
  3. Spring Boot CLI

What is Spring Boot?

          Spring Boot is a framework for building Java applications quickly and with less configuration. It simplifies development by providing default settings and integrating seamlessly with other Spring projects and libraries.

                     Angular vs Spring Boot 2024 Comparison | FinancesOnline

What is Framework?

          A framework is a structure that you can build software on. It serves as a foundation, so you’re not starting entirely from scratch. Frameworks are typically associated with a specific programming language and are suited to different types of tasks.

 

Spring Vs Spring Boot:

Spring

Spring Boot

Avoids boiler plate code. Wraps Dependencies together in a single Unit.

Specify Each and Every Dependencies Seperately. This take more time.

Can be packaged as a jar with embedded server by default.

Will need a lot of configuration to be written to achieve the same.

Reduces development time and increases productivity so that production ready applications can be build quickly.

Takes Significantly more time to achieve the same- example of time consuming tasks would be error prone dependency additions where version’s don’t match

 

Why Use Spring Boot?

  1. It uses the dependency injection approach.
  2. It contains powerful database transaction management capabilities.
  3. It simplifies integration with other java frameworks like JPA/Hibernate ORM, Struts, etc.
  4. It reduces the cost and development time of the application.

 

 

Features of Spring Boot:

  1. Auto Configuration

Spring Boot's @SpringBootApplication annotation enables auto-configuration, which sets up your application based on libraries in the classpath, removing the need for manual bean configuration.

 
  1. Standalone Nature

Spring Boot apps are self-contained and can run independently without external servers, simplifying microservices architecture.

 
  1. Production Ready

Built-in tools like the Actuator module provide efficient monitoring and management features for production applications.

 
  1. No Code Generation

Developers can focus solely on business logic as Spring Boot handles configurations without generating code or requiring XML configurations.
  1. Opinionated Defaults

Starter POMs offer ready-to-use settings, simplifying build configurations, while still allowing manual dependency additions.

 
  1. Supports Microservices

Spring Boot seamlessly integrates with Spring Cloud for creating lightweight, independent microservices with easy deployment and dynamic service discovery.

 
  1. Embedded Servers

Supports embedded servers like Tomcat, Jetty, and Undertow, allowing applications to run standalone without deploying WAR files.

 
  1. Extensive Plugin Support

Tools like the Spring Boot Maven plugin simplify packaging and starting applications, while web tools aid in quick setup.

 
  1. Customizable

While Spring Boot provides default configurations, developers can easily customize settings, components, and setups as needed.

 
  1. Extensions

Provides extensions for connecting with various tools and libraries, facilitating easy integration through pre-configured starters for technologies like JPA, Thymeleaf, and Security.

 

 

 

Spring Boot Development Environment Setup:

Step 1:

          Setup an IDE (Integrated Development Environment):

using an IDE like IntelliJ IDEA, Eclipse, or Spring Tool Suite (STS) can greatly simplify development. These IDEs often come with built-in support for Spring Boot projects.

IntelliJ IDEA - Wikipedia    Eclipse IDE Download for Free - 2023 Latest Version

 

Step 2:

          Create a new Spring Boot Project:

You can create a Spring Boot project using Spring Initializr, either through its web interface (https://start.spring.io/)      

When using the web interface, you select the dependencies you need for your project (e.g., Spring Web, Spring Data JPA, Spring Security) and

Download a Zip file containing your project setup.

 

Step 3:

          Import the Project into your IDE:

If you've generated the project using Spring Initializr's web interface, unzip the downloaded file and import the project into your IDE.

Step 4:

          Write Your Application Code:

Start writing your Spring Boot application code. Spring Boot follows convention over configuration, meaning it provides sensible defaults that you can override as needed.

Step 5

          Run Your Application:

Most IDEs allow you to run Spring Boot applications directly from within the IDE.

Step 6:

          Access Your Application:

Once your application is running, you can access it through a web browser or an API client, depending on what type of application you've built.

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Project Structure:

The project structure generated by Spring Boot Initializr for a Java-based project typically follows a standard Maven project structure.

 

src/main/java: Contains Java source files.

src/main/resources: Holds non-Java resources like configuration files.

src/test/java: Houses Java source files for tests.

src/test/resources: Contains test-specific resources.

pom.xml (Maven) or build.gradle (Gradle): Build configuration files.

Create a basic “Hello World!” RESTful API Service:

@SpringBootApplication annotation is used to indicate that this is a Spring Boot application.

 

@RestController annotation is used to mark the class as a controller where Spring will automatically handle the mapping between HTTP requests and handler methods.

The hello() method is annotated with @GetMapping("/hello"), specifying that it handles GET requests to the /hello endpoint. When accessed, it returns the string "Hello, World!".

 

Once you run this application, it will start an embedded web server (by default on port 8080),

 

 

and you can access the "Hello World" message by making a GET request to http://localhost:8080/hello.

 

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