Understand the writing skills of various starters and custom starters that come with Spring Boot

Spring Boot is a very popular framework for quickly building applications. It comes with many starters that make building applications easier. Starter is a set of dependencies and configurations that can help developers quickly integrate a certain functional module. In addition to the starter provided by Spring Boot by default, we can also write our own starter to extend the functions of Spring Boot. In this article, we will delve into the various starters that come with Spring Boot and how to write custom starters.

1. Spring Boot’s own starter
1.1 Spring Boot Web Starter
Spring Boot Web Starter is a core starter of Spring Boot, which provides support for Spring MVC, Tomcat, WebSocket and other Web functions. support. When building a web application based on Spring Boot, you only need to add the spring-boot-starter-web dependency. This dependency also includes Spring Boot’s support for Spring Data JPA and the Thymeleaf template engine. Through the @Configuration and @EnableAutoConfiguration annotations, the starter can also automatically configure the basic configuration of Spring MVC, such as DispatcherServlet, RequestMappingHandlerMapping, RequestMappingHandlerAdapter, etc.

1.2 Spring Boot Security Starter
Spring Boot Security Starter provides convenient security framework integration functions that can be used to quickly build application security modules. This starter can be enabled by adding spring-boot-starter-security dependency. The starter uses form-based login for authentication by default and provides role-based access control. When configuring security, it is recommended to use Java Config, which can be achieved through the @EnableWebSecurity annotation.

1.3 Spring Boot Data Starter
Spring Boot Data Starter is a starter used to simplify the development of Spring Data projects. It includes various data storage modules such as Spring Data JPA, Spring Data MongoDB, and Spring Data Redis. support. By adding spring-boot-starter-data-jpa, spring-boot-starter-data-mongodb and other dependencies, you can easily integrate different persistent storage solutions.

1.4 Spring Boot Actuator Starter
Spring Boot Actuator Starter provides a large number of runtime diagnostics and management functions for Spring Boot applications, such as viewing system information, monitoring performance indicators, viewing logs, etc. This starter can be enabled by adding the spring-boot-starter-actuator dependency. The starter provides many custom endpoints that can be enabled or disabled through configuration files.

2. Tips for writing custom starters
In addition to using the starter provided by Spring Boot by default, we can also extend the functions of Spring Boot by customizing the starter. The following introduces the writing skills of custom starter:

2.1 Define starter
The first step to customize starter is to define the starter module. In the maven project, you only need to create an ordinary Java project, then add the spring-boot-starter-parent dependency in the pom.xml file, and define a package in the src/main/java directory to store Auto-Configuration kind. Next, create a MyStarter class as the entry point for the custom starter.

2.2 Configuring starter
Customized starter needs to provide configurable options for users, which can be done by defining Spring Boot's Auto-Configuration in the src/main/resources/META-INF/spring.factories file. class to implement. For example, you can define a MyStarterAutoConfiguration class and use @Configuration and @EnableConfigurationProperties annotations to implement Starter configuration.

2.3 Using starter
After completing the writing of the custom starter, you can use it in the Spring Boot application. We only need to add the dependencies of the starter we wrote ourselves in the pom.xml file of the application. Spring Boot will automatically scan all Auto-Configuration classes and automatically configure them according to the user's configuration.

3. Summary
Spring Boot provides many starters to make building applications easier. When we need to use new features, we can also write our own starter and integrate it into existing Spring Boot applications. Through the introduction of this article, I believe you have mastered the various starters that come with Spring Boot and the writing skills of custom starters.

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