如何将Mono<FilePart>保存到MongoDB？

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import reactor.core.publisher.Mono;

@Service
public class FileService {

    @Autowired
    private MongoTemplate mongoTemplate;

    public void saveFile(Mono<FilePart> filePartMono) {
        filePartMono.flatMap(filePart -> {
            // 将FilePart转换为字节数组
            return filePart.content().map(dataBuffer -> {
                byte[] bytes = new byte[dataBuffer.readableByteCount()];
                dataBuffer.read(bytes);
                // 创建一个文件对象，用于保存到MongoDB
                FileModel fileModel = new FileModel();
                fileModel.setFileName(filePart.filename());
                fileModel.setFileContent(bytes);
                return fileModel;
            });
        }).subscribe(fileModel -> {
            // 保存文件到MongoDB
            mongoTemplate.save(fileModel);
        });
    }
}