在Web Flux中记录POST请求正文

Question

我正在尝试通过以下方式在Web-flux中记录请求正文：webflux-demo 但是，即使我传递请求正文，也总是以空字符串结尾。 requestBody.map无法执行。它跳过该块。我想念什么？

    @Override
public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain) {
    if(logging.enabled()){
        ServerHttpRequest request = exchange.getRequest();
        System.out.println("Request body : " + getRequestBody(request));
        return chain.filter(exchange);
    } else {
        return chain.filter(exchange);
    }
}

private String getRequestBody(ServerHttpRequest request) {
    final ServerHttpRequest decorated = new ServerHttpRequestDecorator(request);
    final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    Flux<DataBuffer> requestBody = decorated.getBody();
    requestBody.map(dataBuffer -> {
        try {
            Channels.newChannel(byteArrayOutputStream)
                .write(dataBuffer.asByteBuffer().asReadOnlyBuffer());
        } catch (IOException e) {
            logger.error("Unable to log input request due to an error", e);
        }
        return dataBuffer;
    });

    return byteArrayOutputStream.toString();
}