Comprehensive Guide to Spring MVC Annotations and Related Spring Annotations

The article introduces the purpose of the @RequestMapping annotation, which maps web requests to handler methods, and lists its six attributes: value, method, params, header, consume, and produce, with brief explanations for each.

It then shows a complete example class annotated with @RestController that demonstrates various @RequestMapping configurations, including GET, POST, parameter filtering, and response content types.

Subsequent sections cover other request‑mapping shortcuts: @GetMapping, @PostMapping, @PutMapping, @DeleteMapping, and @PatchMapping, each described as a convenient alias for @RequestMapping with a specific HTTP method.

The article explains @RequestBody for binding request bodies to objects, the optional use of @Valid for validation, and provides a @PostMapping example that creates a user.

It details @ControllerAdvice and its companion annotations @ExceptionHandler, @InitBinder, and @ModelAttribute, illustrating how to define a global exception handler and custom data binding logic.

Further, the guide covers component‑scanning annotations: @Component, @Service, @Repository, and @ComponentScan, explaining their role in bean registration.

The dependency‑injection section discusses @Autowired, @Primary, @Qualifier, and lifecycle annotations @PostConstruct and @PreDestroy, with sample code showing initialization and cleanup methods.

Bean definition is covered with @Bean, including initMethod and destroyMethod attributes, and the use of @Scope to control bean lifecycles (singleton, prototype, etc.).

Finally, the article introduces Spring Boot’s core annotations: @SpringBootApplication, @EnableAutoConfiguration, and various conditional annotations ( @ConditionalOnClass, @ConditionalOnMissingClass, @ConditionalOnBean, @ConditionalOnMissingBean, @ConditionalOnProperty, @ConditionalOnResource, @ConditionalOnWebApplication, @ConditionalOnNotWebApplication, @ConditionalExpression, and @Conditional), describing how they enable fine‑grained auto‑configuration based on classpath, bean presence, properties, resources, and custom conditions.

The article concludes with a summary stating that it has covered the most common Spring Boot annotations, providing a unified reference for developers.