前言：前不久在写开放平台项目中，想直接在微服务网关Gateway中写对外接口，并想通过传统的HttpServlet方式去拿请求里面的数据，在Controller的方法参数上加上HttpServerRequest却发现报错。
1、问题复现
在我们使用spring-boot-starter-web依赖的时候，我们可以在controller的接口类的方法参数中使用HttpServletResponse或HttpServletRequest进行参数返回或获取，但是一旦修改为了spring-boot-starter-webflux依赖，那么就不能再方法参数中使用HttpServletResponse或HttpServletRequest了，否则会出现下面的错误
2023-02-19 13:47:20.619 ERROR 167008 --- [nio-8086-exec-1] a.w.r.e.AbstractErrorWebExceptionHandler : [2e404351] 500 Server Error for HTTP POST "/merchant/merchantLogin"
java.lang.IllegalStateException: No primary or default constructor found for interface javax.servlet.http.HttpServletResponse
at org.springframework.web.reactive.result.method.annotation.ModelAttributeMethodArgumentResolver.createAttribute(ModelAttributeMethodArgumentResolver.java:211) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.reactive.result.method.annotation.ModelAttributeMethodArgumentResolver.prepareAttributeMono(ModelAttributeMethodArgumentResolver.java:161) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.reactive.result.method.annotation.ModelAttributeMethodArgumentResolver.resolveArgument(ModelAttributeMethodArgumentResolver.java:117) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:123) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.reactive.result.method.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:191) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.reactive.result.method.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:135) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter.lambda$handle$1(RequestMappingHandlerAdapter.java:199) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:44) [reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:153) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxSwitchIfEmpty$SwitchIfEmptySubscriber.onNext(FluxSwitchIfEmpty.java:67) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:76) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.innerNext(FluxConcatMap.java:275) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxConcatMap$ConcatMapInner.onNext(FluxConcatMap.java:849) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:121) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2070) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:162) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:1878) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onSubscribe(Operators.java:1752) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:90) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoMapFuseable.subscribe(MonoMapFuseable.java:59) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Mono.subscribe(Mono.java:3694) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.drain(FluxConcatMap.java:442) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxConcatMap$ConcatMapImmediate.onSubscribe(FluxConcatMap.java:212) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:139) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxIterable.subscribe(FluxIterable.java:63) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxConcatMap.subscribe(FluxConcatMap.java:121) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoNext.subscribe(MonoNext.java:40) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoSwitchIfEmpty.subscribe(MonoSwitchIfEmpty.java:44) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1505) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoZip$ZipCoordinator.signal(MonoZip.java:247) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoZip$ZipInner.onNext(MonoZip.java:329) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2070) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoZip$ZipInner.onSubscribe(MonoZip.java:318) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Mono.subscribe(Mono.java:3694) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoZip.subscribe(MonoZip.java:128) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:150) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:114) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1505) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoProcessor.onNext(MonoProcessor.java:389) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2070) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoProcessor.onSubscribe(MonoProcessor.java:399) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:54) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Mono.subscribe(Mono.java:3694) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoProcessor.add(MonoProcessor.java:531) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoProcessor.subscribe(MonoProcessor.java:444) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoMap.subscribe(MonoMap.java:55) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoFlatMap.subscribe(MonoFlatMap.java:60) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoPeekFuseable.subscribe(MonoPeekFuseable.java:74) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoDefer.subscribe(MonoDefer.java:52) [reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoPeekTerminal.subscribe(MonoPeekTerminal.java:61) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoOnErrorResume.subscribe(MonoOnErrorResume.java:44) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Mono.subscribe(Mono.java:3694) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoIgnoreThen$ThenIgnoreMain.drain(MonoIgnoreThen.java:172) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.MonoIgnoreThen.subscribe(MonoIgnoreThen.java:56) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at reactor.core.publisher.Mono.subscribe(Mono.java:3694) ~[reactor-core-3.2.6.RELEASE.jar:3.2.6.RELEASE]
at org.springframework.http.server.reactive.ServletHttpHandlerAdapter.service(ServletHttpHandlerAdapter.java:192) ~[spring-web-5.1.5.RELEASE.jar:5.1.5.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[na:1.8.0_141]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[na:1.8.0_141]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.16.jar:9.0.16]
at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_141]
Caused by: java.lang.NoSuchMethodException: javax.servlet.http.HttpServletResponse.
at java.lang.Class.getConstructor0(Class.java:3082) ~[na:1.8.0_141]
at java.lang.Class.getDeclaredConstructor(Class.java:2178) ~[na:1.8.0_141]
at org.springframework.web.reactive.result.method.annotation.ModelAttributeMethodArgumentResolver.createAttribute(ModelAttributeMethodArgumentResolver.java:208) ~[spring-webflux-5.1.5.RELEASE.jar:5.1.5.RELEASE]
... 91 common frames omitted
2、GateWay的webflux跟SpringBoot的web存在冲突所以没办法用传统的HttpServletRequest方式; GateWay网关的controller接口中无法直接获取ServerHttpRequest，需要拿ServerWebExchange后，从ServerWebExchange对象中获取ServerHttpRequest
public Result
ServerHttpRequest serverHttpRequest = exchange.getRequest();
if (!("POST".equals(serverHttpRequest.getMethodValue()))) {
throw new BussinessException(GateWayStatusCode.METHOD_NOT_SUPPORT);
}
String uri = serverHttpRequest.getURI().getPath();
//获取接口标识,路径里面的/也算一个子路径的占位符
String apiMark = serverHttpRequest.getPath().subPath(5,6).toString();
// 获取 IP 地址
String ip = IpUtil.getIP(serverHttpRequest);
String nowDate = DateUtil.formatDate(DateUtil.date());
HttpHeaders httpHeaders = serverHttpRequest.getHeaders();
}
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