[참고 강의] 실전! 스프링 부트와 JPA 활용2 - API 개발과 성능 최적화
@RestController
@RequiredArgsConstructor
public class MemberApiController {
private final MemberService memberService;
@PostMapping("/api/v1/members")
public CreateMemberResponse saveMemberV1(@RequestBody @Valid Member member) {
Long id = memberService.join(member);
return new CreateMemberResponse(id);
}
@Data
static class CreateMemberRequest {
@NotEmpty
private String name;
}
@Data
static class CreateMemberResponse {
private Long id;
public CreateMemberResponse(Long id) {
this.id = id;
}
}
}
요청 값으로 Member 엔티티 대신에 별도의 DTO를 받는다.
@PostMapping("/api/v2/members")
public CreateMemberResponse saveMemberV2(@RequestBody @Valid CreateMemberRequest request) {
Member member = new Member();
member.setName(request.getName());
Long id = memberService.join(member);
return new CreateMemberResponse(id);
}
엔티티를 API 스펙에 노출하면 안된다.
@PutMapping("/api/v2/members/{id}")
public UpdateMemberResponse updateMemberV2(
@PathVariable("id") Long id,
@RequestBody @Valid UpdateMemberRequest request) {
memberService.update(id, request.getName());
Member findMember = memberService.findOne(id);
return new UpdateMemberResponse(findMember.getId(), findMember.getName());
}
@Data
static class UpdateMemberRequest {
private String name;
}
@Data
@AllArgsConstructor
static class UpdateMemberResponse {
private Long id;
private String name;
}
MemberService
@Transactional
public void update(Long id, String name) {
Member member = memberRepository.findOne(id);
member.setName(name);
}
회원조회 V1 : 응답 값으로 엔티티를 직접 외부에 노출
public class MemberApiController {
private final MemberService memberService;
@GetMapping("/api/v1/members")
public List<Member> membersV1() {
return memberService.findMembers();
}
}
회원조회 V2 : 응답 값으로 엔티티가 아닌 별도의 DTO 사용
@GetMapping("/api/v2/members")
public Result membersV2() {
List<Member> findMembers = memberService.findMembers();
List<MemberDto> collect = findMembers.stream()
.map(m -> new MemberDto(m.getName()))
.collect(Collectors.toList());
return new Result(collect.size(), collect);
}
@Data
@AllArgsConstructor
static class Result<T> {
private int count;
private T data;
}
@Data
@AllArgsConstructor
static class MemberDto {
private String name;
}