如何查找通过Dropwizard REST API上传的文件的大小

@POST
@Path("/upload")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(@FormDataParam("file") InputStream fileInputStream,
                           @FormDataParam("file") FormDataContentDisposition fileDetail) {
    try {
        // 获取文件大小
        File file = new File(fileDetail.getFileName());
        long fileSize = file.length();
        
        // 其他处理文件上传的逻辑...
        
        return Response.status(Response.Status.OK).build();
    } catch (Exception e) {
        return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
    }
}

@POST
@Path("/upload")
@Consumes(MediaType.MULTIPART_FORM_DATA)
public Response uploadFile(@FormDataParam("file") InputStream fileInputStream,
                           @FormDataParam("file") FormDataContentDisposition fileDetail) {
    try {
        // 获取文件大小
        File file = new File(fileDetail.getFileName());
        long fileSize = file.length();
        
        // 使用腾讯云COS SDK上传文件
        COSClient cosClient = new COSClient(...);
        PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, fileDetail.getFileName(), fileInputStream);
        PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
        
        // 其他处理文件上传的逻辑...
        
        return Response.status(Response.Status.OK).build();
    } catch (Exception e) {
        return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
    }
}