fix(controller): 修复文件上传参数绑定与异常处理

- FileController：把 @RequestParam 改成 @RequestPart 并去掉多余注解
- GlobalExceptionHandler：新增 MissingServletRequestPartException 拦截，返回 FILE_IS_EMPTY 错误码
- RequestBodyCacheFilter：跳过 multipart 请求，避免文件上传被缓存过滤器破坏
- UserServiceImpl：修正更新语句为 updateById，防止字段丢失

src/main/java/com/yolo/keyborad/controller/FileController.java

@@ -27,8 +27,7 @@ public class FileController {
 
     @PostMapping("/upload")
     @Operation(summary = "上传文件", description = "上传文件接口")
-    @Parameter(name = "file",required = true,description = "上传的文件")
-    public BaseResponse<String> upload(@RequestParam("file") MultipartFile file){
+    public BaseResponse<String> upload(@RequestPart("file") MultipartFile file){
         String fileUrl = fileService.upload(file);
         return ResultUtils.success(fileUrl);
     }

src/main/java/com/yolo/keyborad/exception/GlobalExceptionHandler.java

@@ -9,6 +9,7 @@ import jakarta.servlet.http.HttpServletRequest;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.multipart.support.MissingServletRequestPartException;
 
 /**
  * 全局异常处理器
@@ -25,6 +26,20 @@ public class GlobalExceptionHandler {
         this.i18nService = i18nService;
     }
 
+    @ExceptionHandler(MissingServletRequestPartException.class)
+    public BaseResponse<?> missingServletRequestPartExceptionHandler(MissingServletRequestPartException e, HttpServletRequest request) {
+        log.error("missingServletRequestPartException: " + e.getMessage(), e);
+
+        String acceptLanguage = request.getHeader("Accept-Language");
+        String errorMessage = i18nService.getMessageWithAcceptLanguage(String.valueOf(ErrorCode.FILE_IS_EMPTY.getCode()), acceptLanguage);
+
+        if (errorMessage == null) {
+            errorMessage = ErrorCode.FILE_IS_EMPTY.getMessage();
+        }
+
+        return ResultUtils.error(ErrorCode.FILE_IS_EMPTY.getCode(), errorMessage);
+    }
+
     @ExceptionHandler(BusinessException.class)
     public BaseResponse<?> businessExceptionHandler(BusinessException e, HttpServletRequest request) {
         log.error("businessException: " + e.getMessage(), e);

src/main/java/com/yolo/keyborad/filter/RequestBodyCacheFilter.java

@@ -18,15 +18,27 @@ public class RequestBodyCacheFilter extends OncePerRequestFilter {
                                     FilterChain filterChain)
             throws ServletException, IOException {
 
-        // 只缓存一次
-        if (!(request instanceof CachedBodyHttpServletRequest)) {
+        // 获取请求的内容类型
+        String contentType = request.getContentType();
         
+        // 跳过 multipart 请求，避免破坏文件上传功能
+        if (contentType != null && contentType.toLowerCase().startsWith("multipart/")) {
+            // 对于文件上传请求，直接放行，不进行请求体缓存
+            filterChain.doFilter(request, response);
+            return;
+        }
+
+        // 检查是否已经进行过请求体缓存，避免重复缓存
+        if (!(request instanceof CachedBodyHttpServletRequest)) {
+            // 创建缓存请求对象，包装原始请求以支持多次读取请求体
             CachedBodyHttpServletRequest cachedRequest = new CachedBodyHttpServletRequest(request);
             
+            // 使用缓存的请求对象继续执行过滤器链
             filterChain.doFilter(cachedRequest, response);
             return;
         }
 
+        // 如果已经是缓存过的请求，则直接执行过滤器链
         filterChain.doFilter(request, response);
     }
 }

src/main/java/com/yolo/keyborad/service/impl/UserServiceImpl.java

@@ -191,7 +191,8 @@ public class UserServiceImpl extends ServiceImpl<KeyboardUserMapper, KeyboardUse
         }
 
         KeyboardUser keyboardUser = BeanUtil.copyProperties(keyboardUserReq, KeyboardUser.class);
-        Integer i = keyboardUserMapper.updateByuid(keyboardUser);
+        keyboardUser.setId(loginIdAsLong);
+        int i = keyboardUserMapper.updateById(keyboardUser);
         if (i <=0 ) {
             throw new BusinessException(ErrorCode.USER_INFO_UPDATE_FAILED);
         }