Introduction to Spring Boot

Spring Boot is a framework built on top of the Spring framework that simplifies the development of Java applications. It provides a convention-over-configuration approach, removing the need for explicit configuration and allowing developers to focus on writing business logic.

Why use Spring Boot?

Spring Boot offers several benefits that make it a popular choice for building web applications:

1. Rapid development: Spring Boot provides a range of features and libraries that enable developers to quickly build applications without having to deal with tedious boilerplate code.

2. Auto-configuration: Spring Boot automatically configures the application based on the dependencies present in the classpath. This saves developers from the hassle of manually configuring different components.

3. Embedded server: Spring Boot comes with an embedded server, such as Tomcat or Jetty, which eliminates the need for deploying the application to an external server.

4. Production-ready: Spring Boot offers various features that facilitate production deployment, such as health checks, metrics, and easy management of dependencies.

Building a Spring Boot Application

To build a Spring Boot application, follow these steps:

1. Setup: Set up a new Spring Boot project using a build tool like Maven or Gradle.

2. Dependencies: Define the required dependencies in your project's configuration file (e.g., pom.xml for Maven). Spring Initializr is a handy tool for generating the initial project structure and dependencies.

3. Create the main class: Create a main class with the @SpringBootApplication annotation. This annotation marks the class as the entry point of the Spring Boot application.

4. Implement business logic: Write your business logic by creating controllers, services, and repositories.

5. Run the application: Run the Spring Boot application using an IDE or by executing the generated JAR file.

Here's an example of a simple Spring Boot application:

1import org.springframework.boot.SpringApplication;
2import org.springframework.boot.autoconfigure.SpringBootApplication;
3
4@SpringBootApplication
5public class MyApp {
6
7    public static void main(String[] args) {
8        SpringApplication.run(MyApp.class, args);
9    }
10
11}

The @SpringBootApplication annotation combines three essential annotations: @Configuration, @EnableAutoConfiguration, and @ComponentScan.

By following these steps, you can quickly get started with building web applications using Spring Boot.

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import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

​

@SpringBootApplication

public class MyApp {

​

    public static void main(String[] args) {

        SpringApplication.run(MyApp.class, args);

    }

​

}