Spring boot 3.x 부터는 javax.servlet.http.HttpServletRequest를 지원하지 않음jakarta.servlet.http.HttpServletRequest를 사용해야 함

외부 디렉토리를 static으로 설정spring.web.resources.static-locations=file:/uploads/여러 디렉토리를 static으로 설정spring.web.resources.static-locations="file:/uploads/classpath:/static/"

filePath 정보를 계속 변경해서 while문으로 존재여부를 확인하는게 중요@PostMapping("/upload")public ResponseEntity handleFileUpload(@RequestParam("file") MultipartFile file) throws IOException { // Define the directory where files will be saved String uploadDir = "uploads/"; // Ensure the directory exists Path uploadPath = Paths.get(uploadDir); if (!Files.exists(uploadPath)) { Files.createDirectorie..

작은 파일public Map upload(@RequestParam("file") MultipartFile file) { Path filePath = uploadPath.resolve(file.getOriginalFilename()); Files.write(filePath, file.getBytes());큰 파일public Map upload(@RequestParam("file") MultipartFile file) { Path filePath = uploadPath.resolve(newFilename); Files.copy(file.getInputStream(), filePath, StandardCopyOption.REPLACE_EXISTING);

application.ymlfile: upload-dir: /path/uploadsController@Value("${file.upload-dir}")private String uploadDir;

Map을 통해서 응답 처리해야 함Case1@PostMapping("/location/upload")public ResponseEntity uploadFile(@RequestParam("file") MultipartFile file) { try { // Handle file storage Path path = Paths.get("uploads/" + file.getOriginalFilename()); Files.write(path, file.getBytes()); // Success response return ResponseEntity.ok(Map.of("success", true, "message", "File uploaded succ..