[springboot] Multipart로 다중 파일 업로드하기

• fileupload.yml

spring:
  servlet:
    multipart:
      enabled: true
      max-file-size: 10MB
      max-request-size: 10MB

file:
  upload-dir: "경로"

 

• application.yml

10번 라인 추가

spring:
  application:
    name: project-api
  profiles:
    active: local
  config:
    import:
      - config/database.yml
      - config/security.yml
      - config/fileupload.yml
  cache:
    type: simple

 

• FileUploadMultipartServcie.java

/**
 * MultipartFile을 이용한 파일 업로드 구현
 */
@Service
@Slf4j
public class FileUploadMultipartService {
    @Value("${file.upload-dir}")
    private String uploadDir;

    public List<String> uploadFiles(ArrayList<MultipartFile> files) throws IOException {

        List<String> uploadedFileNames = new ArrayList<>();

        // 업로드 디렉터리가 없으면 생성
        Path uploadPath = Paths.get(uploadDir);
        if (!Files.exists(uploadPath)) {
            Files.createDirectories(uploadPath);
        }

        for (MultipartFile file : files) {
            // 고유한 파일 이름 생성
            String originalFilename = file.getOriginalFilename();
            String fileExtension = originalFilename.substring(originalFilename.lastIndexOf("."));
            String uniqueFilename = UUID.randomUUID().toString() + fileExtension;

            // 파일 저장
            Path filePath = uploadPath.resolve(uniqueFilename);
            Files.copy(file.getInputStream(), filePath);

            uploadedFileNames.add(uniqueFilename);
        }

        return uploadedFileNames;
    }
}

 

• FileUploadController

@Slf4j
@RestController
@RequestMapping("/files/upload")
public class FileUploadController {
    private final String EP_ADD_FILES_MULTIPART = "/multipart";

    @Autowired
    private FileUploadMultipartService fileUploadMultipartService;

    @PostMapping(value = EP_ADD_FILES_MULTIPART, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public BaseResponse<List<String>> uploadFile(@RequestParam("files") ArrayList<MultipartFile> files) {
        BaseResponse response = new BaseResponse();
        try {
            List<String> fileNames = fileUploadMultipartService.uploadFiles(files);
            response.setResult(fileNames);
            return response;
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

 

• 실행 결과