[Spring Boot] S3 Bucket에 파일 업로드

◎ S3 설정

• AWS S3 설정
• IAM 권한 설정

◎ property 설정

cloud:
  aws:
    credentials:
      accessKey: {{ AWS IAM AccessKey }}
      secretKey: {{ AWS IAM SecretKey }}
    s3:
      bucket: {{ bucket 이름 }}
      dir: profile
    region:
      static: ap-northeast-2 # 해당 지역 작성
    stack:
      auto: false

◎ S3에 파일 올리기

• interface

  public interface S3Upload {
  
      String upload(InputStream inputStream, String originFileName, String fileSize);
  }

• implement

  @RequiredArgsConstructor
  @Service
  public class S3UploadImpl implements S3Upload{
  
      @Value("${cloud.aws.s3.bucket}")
      private String bucket;
  
      @Value("${cloud.aws.s3.dir}")
      private String dir;
  
      private final AmazonS3Client s3Client;
  
      @Override
      public String upload(InputStream inputStream, String originFileName, String fileSize) {
  
          // image 체크       
          if (!originFileName.substring(originFileName.length()-4).equals(".jpg") &&
                  !originFileName.substring(originFileName.length()-4).equals(".png")){
              throw new BusinessLogicException(ExceptionCode.NOT_IMAGE_EXTENSION);
          }
  
          // 저장할 파일 이름 설정
          DateTimeFormatter format = DateTimeFormatter.ofPattern("yyyy-MM-dd-HH-mm-ss-SSS");
          // "/"를 이용해 파일 하위 폴더 설정
          String s3FileName = dir + "/" +LocalDateTime.now().format(format)+ "-" + originFileName;
  
          ObjectMetadata objMeta = new ObjectMetadata();
          objMeta.setContentLength(Long.parseLong(fileSize));
  
          s3Client.putObject(bucket, s3FileName, inputStream, objMeta);
  
          return s3Client.getUrl(bucket, s3FileName).toString();
      }
  }

• 사용 예시

    @PatchMapping("/profile-image/{member-id}")
    @Secured("ROLE_USER")
    public ResponseEntity patchImage(@PathVariable("member-id") @Positive long memberId,
                                     Authentication authentication,
                                     @RequestParam("images") MultipartFile multipartFile,
                                     @RequestParam String fileSize) throws IOException {
  
        securityService.checkMemberEqual(authentication, memberId);
        String url = s3Upload.upload(multipartFile.getInputStream(),
                multipartFile.getOriginalFilename(), fileSize);
  
        Member member = new Member();
        member.setMemberId(memberId);
        member.setImage(url);
  
        Member updateMember = memberService.updateMember(member);
        MemberDto.Response response = mapper.memberToMemberResponseDto(updateMember);
        return new ResponseEntity<>(
                new SingleResponseDto(response), HttpStatus.OK
        );
    }

  

◎ 참고 자료

• S3 로컬에서 접근시 경고 메세지 처리
• S3 객체 접근 에러 (Access Denied)