Spring REST Controllers
REST APIs with @RestController, @GetMapping, @PostMapping, @PutMapping, @DeleteMapping, ResponseEntity
1What is the main difference between @RestController and @Controller?
What is the main difference between @RestController and @Controller?
คำตอบ
@RestController is a composite annotation combining @Controller and @ResponseBody. This means all methods in a @RestController automatically return serialized data (JSON/XML) instead of resolving a view. @RestController is ideal for creating REST APIs, while @Controller is used for traditional web applications with HTML views.
2What is the role of @RequestBody annotation in a REST method?
What is the role of @RequestBody annotation in a REST method?
คำตอบ
@RequestBody tells Spring to deserialize the HTTP request body (typically JSON or XML) into a Java object. Spring uses an HttpMessageConverter (like Jackson for JSON) to perform this conversion automatically. This is essential for receiving complex data in POST or PUT requests.
3Which annotation should be used to map an HTTP DELETE request?
Which annotation should be used to map an HTTP DELETE request?
คำตอบ
@DeleteMapping is a specialized annotation introduced in Spring 4.3 to map HTTP DELETE requests concisely. It's a shortcut for @RequestMapping(method = RequestMethod.DELETE). Spring provides similar annotations for each HTTP method: @GetMapping, @PostMapping, @PutMapping, @PatchMapping.
How to extract a path variable from URL in Spring REST?
What is the advantage of using ResponseEntity<T> instead of directly returning an object?
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