【SpringCloud】Gateway 配置全局过滤器获取请求参数和响应值

@Component
@Slf4j
@AllArgsConstructor
public class HttpRequestFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();

        String method = request.getMethodValue();
        String contentType = request.getHeaders().getFirst("Content-Type");
        if ("POST".equals(method)) {
            return DataBufferUtils.join(exchange.getRequest().getBody())
                    .flatMap(dataBuffer -> {
                        byte[] bytes = new byte[dataBuffer.readableByteCount()];
                        dataBuffer.read(bytes);
                        try {
                            String bodyString = new String(bytes, "utf-8");
                            log.info(bodyString);//打印请求参数
                            exchange.getAttributes().put("POST_BODY", bodyString);
                        } catch (UnsupportedEncodingException e) {
                            e.printStackTrace();
                        }
                        DataBufferUtils.release(dataBuffer);
                        Flux<DataBuffer> cachedFlux = Flux.defer(() -> {
                            DataBuffer buffer = exchange.getResponse().bufferFactory()
                                    .wrap(bytes);
                            return Mono.just(buffer);
                        });

                        ServerHttpRequest mutatedRequest = new ServerHttpRequestDecorator(
                                exchange.getRequest()) {
                            @Override
                            public Flux<DataBuffer> getBody() {
                                return cachedFlux;
                            }
                        };
                        return chain.filter(exchange.mutate().request(mutatedRequest)
                                .build());
                    });
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -200;
    }
}