[springboot] Multipart로 비동기 파일 업로드

• FileUploadMultipartService.java

/**
 * MultipartFile을 이용한 파일 업로드 구현
 */
@Service
@Slf4j
public class FileUploadMultipartService {

    @Autowired
    @Qualifier("fileUploadExecutor")
    private ExecutorService executorService;

    @Value("${file.upload-dir}")
    private String uploadDir;

    /**
     * (방법2) 비동기 파일 업로드
     */
    @Async
    public void uploadFileAsync(MultipartFile file) throws IOException {
        // 고유한 파일 이름 생성
        String uniqueFilename = generateUniqueName(file).get("uniqueFileName");

        File destinationFile = new File(uploadDir + File.separator + uniqueFilename);
        file.transferTo(destinationFile);

        log.info("Async File uploaded : {}", file.getOriginalFilename());
    }

    /**
     * 고유한 파일 이름 생성
     */
    private Map<String, String> generateUniqueName(MultipartFile file) {
        Map<String, String> map = new HashMap<>();

        String originalFilename = file.getOriginalFilename();
        String fileExtension = originalFilename.substring(originalFilename.lastIndexOf("."));
        String uniqueFilename = UUID.randomUUID().toString() + fileExtension;

        map.put("fileExtension", fileExtension);
        map.put("uniqueFilename", uniqueFilename);

        log.error("@@@@map:" + map.get("uniqueFilename"));
        return map;
    }

    private boolean isImageFile(String fileExtension) {
        String lowerCaseExtension = fileExtension.toLowerCase();
        return lowerCaseExtension.equals(".jpg") || lowerCaseExtension.equals(".jpeg") || lowerCaseExtension.equals(".png") || lowerCaseExtension.equals(".gif");
    }
}

 

• FileUploadController.java

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

	@PostMapping(value = EP_ADD_FILES_MULTIPART_ASYNC, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public BaseResponse<List<String>> uploadFileAsync(@RequestParam("files") ArrayList<MultipartFile> files) {
        BaseResponse response = new BaseResponse();
        for (MultipartFile file : files) {
            try {
                fileUploadMultipartService.uploadFileAsync(file);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return response;
    }
}