spring-boot - SpringBoot RestTemplate 使用 LoadBalanced 时超时

Question

我是微服务的新手，正在尝试一个演示项目，其中我有一个客户微服务与 CRUD 微服务通信。我正在使用 Eureka 服务器进行发现。CRUD 服务定义了所有数据库操作，我正在使用 RestTemplate 从客户微服务调用 CRUD 服务中定义的服务。

整体流程是这样的

请注意，它也有付款 MS，但尚未完全开发。

当我在客户 MS RestTemplate postForObject 中使用硬编码的 url 值并且不使用 @LoadBalanced 时。

rest.postForObject("http://localhost:8762/addCustomer", request, Customer.class);

它工作正常。

但是，当我在 RestTemplate 的配置文件中使用 @LoadBalanced 时，会出现以下错误（我了解到在使用 @LoadBalanced 时需要删除 @EnableEurekaClient。试过了，但不起作用。）

"trace": "java.lang.IllegalStateException: 没有可用于 localhost 的实例\n\tat org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:119)\n\tat org.springframework.cloud。 netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:99)\n\tat org.springframework.cloud.client.loadbalancer.LoadBalancerInterceptor.intercept(LoadBalancerInterceptor.java:58)\n\tat org.springframework.http.client. InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:93)\n\tat org.springframework.http.client.InterceptingClientHttpRequest.executeInternal(InterceptingClientHttpRequest.java:77)\n\tat org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal( AbstractBufferingClientHttpRequest.java:48)\n\tat org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53)\n\tat org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:739)\n\tat org.springframework.web.client. RestTemplate.execute(RestTemplate.java:674)\n\tat org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:418)\n\tat com.ms.customer.controller.CustomerController.addCustomer(CustomerController. java:31)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n\tat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\ n\tat java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n\tat java.base/java.lang.reflect.Method.invoke(Method.java:566)\n\ tat org.springframework.web.method.support。InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)\n\tat org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)\n\tat org.springframework.web.servlet.mvc.method. annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)\n\tat org.springframework.web. servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)\n\tat org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)\n\tat org. springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)\n\tat org.springframework.web.servlet. FrameworkServlet.doPost(FrameworkServlet.java:909)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:652)\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java: 883）\n\tat javax.servlet.http.HttpServlet.service（HttpServlet.java:733）\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231）\n\tat org apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)\n\tat org.apache.catalina。核心.ApplicationFilterChain。internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java: 100)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)\n\tat org.springframework.web. filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java: 93)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)\n\tat org.springframework.web. filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache。catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)\n\tat org.apache.catalina.core.StandardContextValve。调用（StandardContextValve.java:97）\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:541）\n\tat org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java: 143)\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)\n\tat org.apache.coyote。 AbstractProcessorLight.process（AbstractProcessorLight.java：65)\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) \n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)\n \tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) \n\tat java.base/java.lang.Thread.run(Thread.java:834)\n",运行（SocketProcessorBase.java:49）\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1128）\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker。运行（ThreadPoolExecutor.java:628）\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run（TaskThread.java:61）\n\tat java.base/java.lang.Thread.run（ Thread.java:834)\n",运行（SocketProcessorBase.java:49）\n\tat java.base/java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1128）\n\tat java.base/java.util.concurrent.ThreadPoolExecutor$Worker。运行（ThreadPoolExecutor.java:628）\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run（TaskThread.java:61）\n\tat java.base/java.lang.Thread.run（ Thread.java:834)\n",

我也尽量不硬编码并使用 RestTemplate 之类的

rest.postForObject("http://CRUDSERVICE/addCustomer", request, Customer.class);

其中 CRUDSERVICEspring.application.name用于 CRUD 服务。

我遇到了与上面相同的错误，但这次是针对 CRUDSERVICE。

没有可用于 CRUDSERVICE 的实例

我需要帮助

1. 如何避免在 RestTemplate 中使用硬编码
2. 如何在此项目中使用功能区

项目Github链接请参考我的github 链接

标签： spring-bootnetflix-eurekanetflix-ribbon