spring cloud gateway中如何讀取請求參數
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 請求參數 */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. 測試輸出，我這邊測試沒有問題，日志正常輸出
在繼承AbstractGatewayFilterFactory的過濾器中
GET請求添加參數// 參考api文檔中GatewapFilter中“添加請求參數攔截器”：AddRequestParameterGatewayFilterFactory.java //記錄日志 //logger.info('全局參數處理: {} url：{} 參數：{}',method.toString(),serverHttpRequest.getURI().getRawPath(),newRequestQueryParams.toString()); // 獲取原參數 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(’&’);} } // 添加查詢參數 query.append(ServiceConstants.COMMON_PARAMETER_ENTERPRISEID+'='+authenticationVO.getEnterpriseId() +'&'+ServiceConstants.COMMON_PARAMETER_USERID+'='+authenticationVO.getUserId()); // 替換查詢參數 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請求添加參數
//從請求里獲取Post請求體 String bodyStr = resolveBodyFromRequest(serverHttpRequest); String userId = '123';// 這種處理方式，必須保證post請求時，原始post表單必須有數據過來，不然會報錯 if (StringUtils.isEmpty(bodyStr)) {logger.error('請求異常：{} POST請求必須傳遞參數', serverHttpRequest.getURI().getRawPath());ServerHttpResponse response = exchange.getResponse();response.setStatusCode(HttpStatus.BAD_REQUEST);return response.setComplete(); } //application/x-www-form-urlencoded和application/json才添加參數 //其他上傳文件之類的，不做參數處理，因為文件流添加參數，文件原格式就會出問題了 /* if (MediaType.APPLICATION_FORM_URLENCODED_VALUE.equalsIgnoreCase(contentType)) {// 普通鍵值對，增加參數bodyStr = String.format(bodyStr+'&%s=%s&%s=%s',ServiceConstants.COMMON_PARAMETER_ENTERPRISEID,authenticationVO.getEnterpriseId(),ServiceConstants.COMMON_PARAMETER_USERID,authenticationVO.getUserId()); }*/ // 新增body參數 if (MediaType.APPLICATION_JSON_VALUE.equalsIgnoreCase(contentType)) {JSONObject jsonObject = new JSONObject(bodyStr);jsonObject.put('userId', userId);bodyStr = jsonObject.toString(); } //記錄日志 logger.info('全局參數處理: {} url：{} 參數：{}', method.toString(), serverHttpRequest.getURI().getRawPath(), bodyStr); //下面的將請求體再次封裝寫回到request里，傳到下一級，否則，由于請求體已被消費，后續的服務將取不到值 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); // 定義新的消息頭 HttpHeaders headers = new HttpHeaders(); headers.putAll(exchange.getRequest().getHeaders()); // 添加消息頭// headers.set(ServiceConstants.SHIRO_SESSION_PRINCIPALS,GsonUtils.toJson(authenticationVO)); // 由于修改了傳遞參數，需要重新設置CONTENT_LENGTH，長度是字節長度，不是字符串長度 int length = bodyStr.getBytes().length; headers.remove(HttpHeaders.CONTENT_LENGTH); headers.setContentLength(length); // 設置CONTENT_TYPE if (StringUtils.isEmpty(contentType)) {headers.set(HttpHeaders.CONTENT_TYPE, contentType); } // 由于post的body只能訂閱一次，由于上面代碼中已經訂閱過一次body。所以要再次封裝請求到request才行，不然會報錯請求已經訂閱過 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;} }; //封裝request，傳給下一級 request.mutate().header(HttpHeaders.CONTENT_LENGTH, Integer.toString(bodyStr.length())); return chain.filter(exchange.mutate().request(request).build()); /** * 從Flux<DataBuffer>中獲取字符串的方法 * @return 請求體 */ private String resolveBodyFromRequest(ServerHttpRequest serverHttpRequest) {//獲取請求體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());});//獲取request bodyreturn bodyRef.get(); }
/*** 字符串轉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;}
以上為個人經驗，希望能給大家一個參考，也希望大家多多支持好吧啦網。
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