在Spring Boot中处理文件上传功能实现

# application.properties
spring.servlet.multipart.max-file-size=2MB
spring.servlet.multipart.max-request-size=10MB

@RestController
public class FileUploadController {
    @PostMapping("/upload")
    public ResponseEntity<String> handleFileUpload(@RequestParam("file") MultipartFile file) {
        try {
            if (file.isEmpty()) {
                return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("File is empty");
            }
            // 文件存储逻辑
            String originalFilename = file.getOriginalFilename();
            File destinationFile = new File("/uploads/" + originalFilename);
            file.transferTo(destinationFile);
            return ResponseEntity.ok("File uploaded successfully: " + originalFilename);
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Could not upload file: " + e.getMessage());
        }
    }
}

@ControllerAdvice
public class FileUploadExceptionAdvice {
    @ExceptionHandler(MaxUploadSizeExceededException.class)
    public ResponseEntity<String> handleMaxSizeException(MaxUploadSizeExceededException exc) {
        return ResponseEntity.status(HttpStatus.EXPECTATION_FAILED).body("File too large!");
    }
}

<!-- simple HTML form to upload a file -->
<form method="POST" action="/upload" enctype="multipart/form-data">
    <input type="file" name="file" />
    <input type="submit" value="Submit" />
</form>