所以我有一個使用 Spring MVC 而不是 Spring Boot 的舊作業應用程式。我在我的專案中添加了 spring-webflux 的 gradle 依賴項，并開始使用 webclient 從我的專案中呼叫外部 API。這是我的 webclient 處理程式類：
@Service
public class WebclientHandler {
private final WebClient webClient;
public WebclientHandler (WebClient.Builder builder) {
this.webClient = builder.baseUrl("baseurl").build();
}
}
現在，當我通過我的 API 呼叫此代碼后，我收到此錯誤：
通過建構式引數 0 表示的不滿足的依賴關系；嵌套例外是 org.springframework.beans.factory.NoSuchBeanDefinitionException：沒有“org.springframework.web.reactive.function.client.WebClient$Builder”型別的合格 bean 可用：預計至少有 1 個有資格作為自動裝配候選者的 bean。依賴注釋：{}
似乎我的應用程式無法找到 Webclient.builder 并且沒有發生建構式注入。這是因為我沒有使用彈簧靴嗎？
這是我的 Gradle 依賴項：
compile(group: 'org.springframework', name: 'spring-webflux', version: '5.3.15')
我是 spring-webflux 反應式編程的新手。
編輯
我也嘗試使用配置創建 Webclient bean：
@Configuration
public class WebClientHandler {
@Bean
public WebClient myWebClient() {
WebClient client = WebClient.builder().baseUrl("baseUrl")
.defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
.defaultHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
.build();
return client;
}
}
現在我在啟動時遇到了這個例外：
{ java.lang.IllegalStateException: No suitable default ClientHttpConnector found
at org.springframework.web.reactive.function.client.DefaultWebClientBuilder.initConnector(DefaultWebClientBuilder.java:297)
at org.springframework.web.reactive.function.client.DefaultWebClientBuilder.build(DefaultWebClientBuilder.java:266)
at com.kronos.orgmap.sbs.impl.service.WebClientHandler.MyWebClient(WebClientHandler.java:41)
at com.kronos.orgmap.sbs.impl.service.WebClientHandler$$EnhancerBySpringCGLIB$$59a9a582.CGLIB$desiWebClient$0(<generated>)
at com.kronos.orgmap.sbs.impl.service.WebClientHandler$$EnhancerBySpringCGLIB$$59a9a582$$FastClassBySpringCGLIB$$76fa510d.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331)
at com.kronos.orgmap.sbs.impl.service.WebClientHandler$$EnhancerBySpringCGLIB$$59a9a582.MyWebClient(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
at org.springframework.beans.factory.support.KronosConstructorResolver.instantiate(KronosConstructorResolver.java:654)
at org.springframework.beans.factory.support.KronosConstructorResolver.instantiateUsingFactoryMethod(KronosConstructorResolver.java:487)
at org.springframework.beans.factory.support.KronosAbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(KronosAbstractAutowireCapableBeanFactory.java:1345)
at org.springframework.beans.factory.support.KronosAbstractAutowireCapableBeanFactory.createBeanInstance(KronosAbstractAutowireCapableBeanFactory.java:1193)
at org.springframework.beans.factory.support.KronosAbstractAutowireCapableBeanFactory.doCreateBean(KronosAbstractAutowireCapableBeanFactory.java:611)
at org.springframework.beans.factory.support.KronosAbstractAutowireCapableBeanFactory.createBean(KronosAbstractAutowireCapableBeanFactory.java:559)
at org.springframework.beans.factory.support.KronosAbstractBeanFactory.lambda$doGetBean$0(KronosAbstractBeanFactory.java:336)
at org.springframework.beans.factory.support.KronosDefaultSingletonBeanRegistry.getSingleton(KronosDefaultSingletonBeanRegistry.java:235)
at org.springframework.beans.factory.support.KronosAbstractBeanFactory.doGetBean(KronosAbstractBeanFactory.java:334)
at org.springframework.beans.factory.support.KronosAbstractBeanFactory.getBean(KronosAbstractBeanFactory.java:209)
at org.springframework.beans.factory.support.KronosDefaultListableBeanFactory.preInstantiateSingletons(KronosDefaultListableBeanFactory.java:952)
at com.kronos.container.impl.startup.KronosBeanFactory.preInstantiateSingletons(KronosBeanFactory.java:226)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4699)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5167)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:743)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:719)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1125)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1859)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
} }
uj5u.com熱心網友回復：
在我的 gradle 中添加這些依賴項為我解決了第二種方法的問題，現在 DefaultWebClientBuilder 能夠啟動連接器以供 webclient 構建器使用。
implementation platform('io.projectreactor:reactor-bom:2020.0.17')
implementation 'io.projectreactor.netty:reactor-netty-core'
implementation 'io.projectreactor.netty:reactor-netty-http'
雖然仍然沒有弄清楚為什么即使在添加了提到的 gradle 依賴項之后第一種方法也不起作用。仍然無法在建構式中找到 WebClient.Builder 類作為 bean。
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標籤：春天 弹簧MVC spring-webflux 网络客户端