我想用webflux和asynchronousfilechannel通过url下载一些照片，所有的文件都创建了，但都是空的。
这是我的密码：

public void downloadFilesFromUrl() throws IOException {
    List<Photo> notDownloadedFiles = //get photos with name and URL;
    for (Photo photo : notDownloadedFiles) {
        Path path = Paths.get(pathToFiles + File.separator + photo.getPhotoName());
        WebClient client = WebClient.builder().baseUrl(photo.getLoadSource()).build();
        Flux<DataBuffer> dataBufferFlux = client
                .get().accept(MediaType.APPLICATION_OCTET_STREAM)
                .retrieve()
                .bodyToFlux(DataBuffer.class);
        saveFileOnComputer(path, dataBufferFlux);
    }
}

private void saveFileOnComputer(Path path, Flux<DataBuffer> dataBufferFlux) throws IOException {
    AsynchronousFileChannel asynchronousFileChannel = AsynchronousFileChannel.open(path, CREATE, WRITE);
    DataBufferUtils.write(dataBufferFlux, asynchronousFileChannel)
            .doOnNext(DataBufferUtils.releaseConsumer())
            .doAfterTerminate(() -> {
                try {
                    asynchronousFileChannel.close();
                } catch (IOException ignored) { }
            }).then();
}

如果我尝试使用

DataBufferUtils.write(dataBufferFlux, path, StandardOpenOption.CREATE).block();

不用调用savefileonserver（..）方法，一切正常。但我想使用完全异步的文件通道。