Overview of Spring Web MVC, Bean, and Boot Annotations

The article introduces the purpose of @RequestMapping in Spring MVC and Spring WebFlux, explaining its six attributes ( value, method, params, header, consume, product) and the need to combine it with @Controller or @RestController.

It then presents examples of specific mapping shortcuts such as @GetMapping, @PostMapping, @PutMapping, @DeleteMapping, and @PatchMapping, each shown with an illustrative image.

The @RequestBody annotation is described as a way to bind HTTP request bodies to method parameters via HttpMessageConverter, with a sample usage image.

Further, the article covers controller‑level annotations: @ControllerAdvice (used with @ExceptionHandler, @InitBinder, @ModelAttribute), @ResponseBody (and its implicit inclusion in @RestController), @ExceptionHandler, @ResponseStatus, @PathVariable, and @RequestParam, each accompanied by example screenshots.

It then explains bean‑related annotations: @ComponentScan, @Component, @Service, @Repository, showing how they register classes in the Spring container.

Dependency‑injection annotations are detailed, including @Autowired (constructor, setter, field injection), @Primary, @PostConstruct, @PreDestroy, and @Qualifier, with corresponding code images.

Scope management is discussed via @Scope (singleton, prototype, request, session, globalSession) and the @Bean annotation’s initMethod and destroyMethod attributes, illustrated with code snippets.

Conditional configuration annotations for Spring Boot are presented: @ConditionalOnClass, @ConditionalOnMissingClass, @ConditionalOnBean, @ConditionalOnMissingBean, @ConditionalOnProperty, @ConditionalOnResource, @ConditionalOnWebApplication, @ConditionalOnNotWebApplication, @ConditionalExpression, and the generic @Conditional, each with brief example code.

Finally, the article summarizes the most common Spring Boot annotations— @SpringBootApplication, @EnableAutoConfiguration, and related conditional annotations—highlighting their role in auto‑configuration and component scanning, and ends with a concluding paragraph reminding readers of the overall coverage.