How does Spring Boot work?

Spring Boot is a development framework based on the Spring framework, designed to simplify the configuration and deployment of Spring applications. Its working principle can be summarized as follows:

1. Automatic configuration: Spring Boot offers a series of automatic configuration mechanisms that automatically configure the default behavior of each module based on the application’s classpath and dependencies. Developers just need to add the corresponding dependencies and write code in the convention directory structure to use Spring Boot’s automatic configuration feature.
2. Embedded servers: Spring Boot comes with several commonly used servers built-in, such as Tomcat and Jetty, eliminating the need for separately configuring or installing external servers. Developers only need to add the necessary dependencies and write a startup class, and Spring Boot will automatically start the embedded server and deploy the application to it.
3. Automatic Configuration: Spring Boot automatically connects various modules based on the application’s dependency relationships. Developers only need to configure the corresponding dependencies and properties, and Spring Boot will automatically assemble the components, enabling dependency injection and the collaborative operation of various modules.
4. Optimization configuration: Spring Boot offers a mechanism for optimizing configuration, allowing developers to flexibly configure according to the needs of the application. This can be done through configuration files, annotations, code, etc., to achieve personalized customization of the application.

In general, Spring Boot simplifies the development, deployment, and configuration process of Spring applications by utilizing features such as auto-configuration, embedded servers, automatic assembly, and optimized configurations, ultimately improving development efficiency and application maintainability.