Ways to implement springboot automatic assembly: 1. Java-based configuration; 2. Automatic configuration; 3. Conditional annotations; 4. Automatic assembly; 5. Spring Boot Starter; 6. Automatic assembly of third-party libraries; 7. Customized automatic assembly; 8. Component scanning; 9. Externalized configuration and attribute-driven configuration; 10. Event-driven automatic assembly; 11. Spring Boot starter POMs; 12. Conditional annotations and conditional classes, etc.
The operating system for this tutorial: Windows 10 system, DELL G3 computer.
Spring Boot simplifies the configuration of Spring applications through the automatic assembly mechanism. It takes advantage of Spring's dependency injection (DI) function, allowing developers to quickly build a fully functional application through automatic configuration and conditional annotations. The following are the main ways Spring Boot implements automatic assembly:
1. Java-based configuration:
2. Automatic configuration:
3. Conditional annotations:
4. Automatic assembly:
5. Spring Boot Starter:
6. Automatic assembly of third-party libraries:
7. Customized automatic assembly:
8. Component scanning:
9. Externalized configuration and property-driven configuration:
Using externalized configuration (such as application.properties), you can easily configure in different environments Use different configuration values or enable/disable certain features. For example, by setting a certain property to a different value, you can control whether a certain bean is created or whether a certain function is enabled.
10. Event-driven automatic assembly: Spring container publishes many events, such as ContextRefreshedEvent, etc. Beans that listen to these events can implement automatic assembly. By listening to these events, some specific functions or initialization logic can be implemented.
11. Spring Boot starter POMs: These are special POMs used to simplify dependency management of specific technologies. For example, after adding the spring-boot-starter-web dependency, the required Spring Web and Tomcat dependencies will be automatically introduced. This not only simplifies dependency management, but also ensures version compatibility.
12. Conditional annotations and conditional classes: Using these features in combination, you can decide whether to create a bean or use a specific implementation based on runtime conditions. For example, you can decide whether to create a bean based on whether a class or a property exists in the classpath.
13. Customized BeanPostProcessor and BeanFactoryPostProcessor: By implementing these interfaces, developers can customize the logic for processing the bean life cycle and configuration. For example, the bean definition can be modified or enhanced in a custom BeanPostProcessor.
14. Combination and mixed use: In practical applications, multiple automatic assembly technologies are usually used in combination. For example, both Java-based configuration and annotations are used to define beans, and Spring Boot's automatic configuration function is used to simplify the configuration of specific technologies. This makes the code more concise and clear while maintaining feature richness.
15. Version control and compatibility: Since Spring Boot and its related technologies are constantly updated and evolved, developers need to pay attention to official documents and version update instructions to ensure that the technology used There is good compatibility between versions. This helps avoid problems and unnecessary complexity caused by version mismatches.
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