找了很多教程，可由于各種原因（主要是Spring Boot和Spring Cloud版本不同），獲取一直有問題，參考過的教程：

• https://windmt.com/2019/01/16/spring-cloud-19-spring-cloud-gateway-read-and-modify-request-body/
• https://my.oschina.net/zcqshine/blog/2875060
• https://blog.51cto.com/thinklili/2329184
  我的項目使用的版本：
• <spring-boot.version>2.1.3.RELEASE</spring-boot.version><spring-cloud.version>Greenwich.SR1</spring-cloud.version>

我最終的Filter如下，其中bodyString 即為請求體中的內容

@Component @Slf4j @AllArgsConstructor public class HttpPostBodyFilter implements GlobalFilter, Ordered {@Overridepublic 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) && contentType.startsWith("multipart/form-data")){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);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()) {@Overridepublic Flux<DataBuffer> getBody() {return cachedFlux;}};return chain.filter(exchange.mutate().request(mutatedRequest).build());});}return chain.filter(exchange);}@Overridepublic int getOrder() {return -200;} }

總結

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