Spring MVC Basics
Spring MVC, MVC architecture, DispatcherServlet, @Controller, ViewResolver, Model-View-Controller pattern
1Which annotation transforms a Java class into a Spring MVC controller?
Which annotation transforms a Java class into a Spring MVC controller?
Відповідь
@Controller marks a class as a Spring MVC controller that handles HTTP requests. It is a specialization of @Component and allows component scanning to automatically detect the controller. @RestController combines @Controller and @ResponseBody for REST APIs, while @RequestMapping defines URL mappings but doesn't declare a controller by itself.
2What is the main difference between @Controller and @RestController?
What is the main difference between @Controller and @RestController?
Відповідь
@RestController combines @Controller and @ResponseBody, meaning all methods automatically return serialized data (JSON/XML) instead of view names. With @Controller, you must add @ResponseBody to each method to return data. @RestController is designed for REST APIs, while @Controller is used for traditional web applications with view rendering.
3How to map a controller method to an HTTP POST request on /users URL?
How to map a controller method to an HTTP POST request on /users URL?
Відповідь
@PostMapping is the specialized annotation for mapping a method to POST requests on a specific URL. It's a shortcut for @RequestMapping(method = RequestMethod.POST). Other specialized annotations include @GetMapping, @PutMapping, @DeleteMapping, and @PatchMapping. This approach is more readable and concise than @RequestMapping with method attribute.
How to retrieve a path variable from a URL like /users/{id}?
Which annotation to use to automatically deserialize JSON from HTTP request body?
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