使用WebFlux从资源中读取和解析文件的被动方式？

import org.springframework.core.io.Resource;
import org.springframework.http.MediaType;
import org.springframework.http.codec.multipart.FilePart;
import org.springframework.http.codec.multipart.Part;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@RestController
public class FileController {

    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public Mono<String> uploadFile(@RequestPart("file") FilePart filePart) {
        Resource resource = filePart.resource();
        
        // 读取文件内容
        Flux<DataBuffer> dataBufferFlux = filePart.content();
        
        // 解析文件内容
        Flux<String> fileContentFlux = dataBufferFlux.map(buffer -> {
            byte[] bytes = new byte[buffer.readableByteCount()];
            buffer.read(bytes);
            DataBufferUtils.release(buffer);
            return new String(bytes, StandardCharsets.UTF_8);
        });
        
        // 对文件内容进行处理
        // ...
        
        return fileContentFlux.collectList().map(contentList -> {
            // 处理文件内容列表
            // ...
            
            return "File uploaded successfully.";
        });
    }
}