controller - res(ResponseEntity, HttpStatus, @ResponseStatus)

HttpStatus

• enum 타입
• HTTP 응답 상태를 정의
• 1XX
  • CONTINUE(100)
  • SWITCHING_PROTOCOLS(101)
  • PROCESSING(102)
  • CHECKPOINT(103)
• 2XX
  • OK(200)
  • CREATED(201)
  • ACCEPTED(202)
  • NON_AUTHORITATIVE_INFORMATION(203)
• 4XX
  • BAD_REQUEST(400)
  • UNAUTHORIZED(401)
  • FORBIDDEN(403)
  • NOT_FOUND(404)
• 5XX
  • INTERNAL_SERVER_ERROR(500)

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@ResponseStatus

• 응답상태 지정
• 주된 사용법은 Exception 정의에 사용하기 위함

Properties

• value: HttpStatus

@ResponseStatus(value= HttpStatus.CREATED)
@PostMapping("/created")
public String good(Info info){
	...
	return "Created";
}

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ResponseEntity

• HTTP요청에 대한 응답 객체
• 응답 상태(HttpStatus)와 응답 헤더 지정가능
• ResponseEntity<T> : T는 body의 타입

응답의 Body가 존재하는 ResponseEntity 객체 생성

• 생성자
  • new ResponseEntity<T>(T body, HttpStatus) -> ResponseEntity<T>
  • new ResponseEntity<T>(T body, HttpHeaders, HttpStatus) -> ResponseEntity<T>
• Builder
  • ResponseEntity.status(HttpStatus).headers(HttpHeaders).body(T body) -> ResponseEntity<T>
• status 지정
  • ResponseEntity.ok(T body) -> ResponseEntity<T>
  • ResponseEntity.ok().headers(headers).build() -> ResponseEntity<T>
  • ResponseEntity.badRequest().headers(headers).body(body) -> ResponseEntity<T>
  • ResponseEntity.notFound().build() -> ResponseEntity<T>

methods

• .getStatusCode() -> HttpStatus
• .getStatusCodeValue() -> int
• .getHeaders() -> HttpHeaders
• .getBody() -> T

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