spring cloud gateway中如何读取请求参数

spring cloud gateway读取请求参数1. 我的版本： spring-cloud：Hoxton.RELEASE spring-boot：2.2.2.RELEASE spring-cloud-starter-gateway2. 请求日志

import lombok.extern.slf4j.Slf4j;import org.springframework.cloud.gateway.filter.GatewayFilterChain;import org.springframework.cloud.gateway.filter.GlobalFilter;import org.springframework.core.io.buffer.DataBuffer;import org.springframework.core.io.buffer.DataBufferUtils;import org.springframework.http.HttpMethod;import org.springframework.http.server.reactive.ServerHttpRequest;import org.springframework.http.server.reactive.ServerHttpRequestDecorator;import org.springframework.stereotype.Component;import org.springframework.web.server.ServerWebExchange;import reactor.core.publisher.Flux;import reactor.core.publisher.Mono; import java.nio.charset.StandardCharsets;import java.util.Map;import java.util.stream.Collectors; /** * @author MinWeikai * @date 2019-12-20 18:09:39 */@Slf4j@Componentpublic class LoggerFilter implements GlobalFilter { @Overridepublic Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {ServerHttpRequest request = exchange.getRequest();String method = request.getMethodValue(); if (HttpMethod.POST.matches(method)) {return DataBufferUtils.join(exchange.getRequest().getBody()).flatMap(dataBuffer -> {byte[] bytes = new byte[dataBuffer.readableByteCount()];dataBuffer.read(bytes);String bodyString = new String(bytes, StandardCharsets.UTF_8);logtrace(exchange, bodyString);exchange.getAttributes().put('POST_BODY', bodyString);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());});} else if (HttpMethod.GET.matches(method)) {Map m = request.getQueryParams();logtrace(exchange, m.toString());}return chain.filter(exchange);} /** * 日志信息 * * @param exchange * @param param 请求参数 */private void logtrace(ServerWebExchange exchange, String param) {ServerHttpRequest serverHttpRequest = exchange.getRequest();String path = serverHttpRequest.getURI().getPath();String method = serverHttpRequest.getMethodValue();String headers = serverHttpRequest.getHeaders().entrySet().stream().map(entry -> ' ' + entry.getKey() + ': [' + String.join(';', entry.getValue()) + ']').collect(Collectors.joining('n'));log.info('n' + '---------------- ---------------- ---------------->>n' +'HttpMethod : {}n' +'Uri: {}n' +'Param : {}n' +'Headers : n' +'{}n' +''<<---------------- ---------------- ----------------', method, path, param, headers);} }3. 测试输出，我这边测试没有问题，日志正常输出

gateway网关转发请求添加参数

在继承AbstractGatewayFilterFactory的过滤器中

GET请求添加参数

// 参考api文档中GatewapFilter中“添加请求参数拦截器”：AddRequestParameterGatewayFilterFactory.java //记录日志 //logger.info('全局参数处理: {} url：{} 参数：{}',method.toString(),serverHttpRequest.getURI().getRawPath(),newRequestQueryParams.toString()); // 获取原参数 URI uri = serverHttpRequest.getURI(); StringBuilder query = new StringBuilder(); String originalQuery = uri.getRawQuery(); if (org.springframework.util.StringUtils.hasText(originalQuery)) {query.append(originalQuery);if (originalQuery.charAt(originalQuery.length() - 1) != ’&’) { query.append(’&’);} } // 添加查询参数 query.append(ServiceConstants.COMMON_PARAMETER_ENTERPRISEID+'='+authenticationVO.getEnterpriseId() +'&'+ServiceConstants.COMMON_PARAMETER_USERID+'='+authenticationVO.getUserId()); // 替换查询参数 URI newUri = UriComponentsBuilder.fromUri(uri) .replaceQuery(query.toString()) .build(true) .toUri(); ServerHttpRequest request = exchange.getRequest().mutate().uri(newUri).build(); return chain.filter(exchange.mutate().request(request).build());POST请求添加参数

//从请求里获取Post请求体 String bodyStr = resolveBodyFromRequest(serverHttpRequest); String userId = '123';// 这种处理方式，必须保证post请求时，原始post表单必须有数据过来，不然会报错 if (StringUtils.isEmpty(bodyStr)) {logger.error('请求异常：{} POST请求必须传递参数', serverHttpRequest.getURI().getRawPath());ServerHttpResponse response = exchange.getResponse();response.setStatusCode(HttpStatus.BAD_REQUEST);return response.setComplete(); } //application/x-www-form-urlencoded和application/json才添加参数 //其他上传文件之类的，不做参数处理，因为文件流添加参数，文件原格式就会出问题了 /* if (MediaType.APPLICATION_FORM_URLENCODED_VALUE.equalsIgnoreCase(contentType)) {// 普通键值对，增加参数bodyStr = String.format(bodyStr+'&%s=%s&%s=%s',ServiceConstants.COMMON_PARAMETER_ENTERPRISEID,authenticationVO.getEnterpriseId(),ServiceConstants.COMMON_PARAMETER_USERID,authenticationVO.getUserId()); }*/ // 新增body参数 if (MediaType.APPLICATION_JSON_VALUE.equalsIgnoreCase(contentType)) {JSONObject jsonObject = new JSONObject(bodyStr);jsonObject.put('userId', userId);bodyStr = jsonObject.toString(); } //记录日志 logger.info('全局参数处理: {} url：{} 参数：{}', method.toString(), serverHttpRequest.getURI().getRawPath(), bodyStr); //下面的将请求体再次封装写回到request里，传到下一级，否则，由于请求体已被消费，后续的服务将取不到值 URI uri = serverHttpRequest.getURI(); URI newUri = UriComponentsBuilder.fromUri(uri).build(true).toUri(); ServerHttpRequest request = exchange.getRequest().mutate().uri(newUri).build(); DataBuffer bodyDataBuffer = stringBuffer(bodyStr); Flux<DataBuffer> bodyFlux = Flux.just(bodyDataBuffer); // 定义新的消息头 HttpHeaders headers = new HttpHeaders(); headers.putAll(exchange.getRequest().getHeaders()); // 添加消息头// headers.set(ServiceConstants.SHIRO_SESSION_PRINCIPALS,GsonUtils.toJson(authenticationVO)); // 由于修改了传递参数，需要重新设置CONTENT_LENGTH，长度是字节长度，不是字符串长度 int length = bodyStr.getBytes().length; headers.remove(HttpHeaders.CONTENT_LENGTH); headers.setContentLength(length); // 设置CONTENT_TYPE if (StringUtils.isEmpty(contentType)) {headers.set(HttpHeaders.CONTENT_TYPE, contentType); } // 由于post的body只能订阅一次，由于上面代码中已经订阅过一次body。所以要再次封装请求到request才行，不然会报错请求已经订阅过 request = new ServerHttpRequestDecorator(request) {@Overridepublic HttpHeaders getHeaders() { long contentLength = headers.getContentLength(); HttpHeaders httpHeaders = new HttpHeaders(); httpHeaders.putAll(super.getHeaders()); if (contentLength > 0) {httpHeaders.setContentLength(contentLength); } else {// TODO: this causes a ’HTTP/1.1 411 Length Required’ on httpbin.orghttpHeaders.set(HttpHeaders.TRANSFER_ENCODING, 'chunked'); } return httpHeaders;}@Overridepublic Flux<DataBuffer> getBody() { return bodyFlux;} }; //封装request，传给下一级 request.mutate().header(HttpHeaders.CONTENT_LENGTH, Integer.toString(bodyStr.length())); return chain.filter(exchange.mutate().request(request).build()); /** * 从Flux<DataBuffer>中获取字符串的方法 * @return 请求体 */ private String resolveBodyFromRequest(ServerHttpRequest serverHttpRequest) {//获取请求体Flux<DataBuffer> body = serverHttpRequest.getBody();AtomicReference<String> bodyRef = new AtomicReference<>();body.subscribe(buffer -> { CharBuffer charBuffer = StandardCharsets.UTF_8.decode(buffer.asByteBuffer()); DataBufferUtils.release(buffer); bodyRef.set(charBuffer.toString());});//获取request bodyreturn bodyRef.get(); }

/*** 字符串转DataBuffer* @param value* @return*/private DataBuffer stringBuffer(String value) {byte[] bytes = value.getBytes(StandardCharsets.UTF_8);NettyDataBufferFactory nettyDataBufferFactory = new NettyDataBufferFactory(ByteBufAllocator.DEFAULT);DataBuffer buffer = nettyDataBufferFactory.allocateBuffer(bytes.length);buffer.write(bytes);return buffer;}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持好吧啦网。