2018-03-24 14:22:14.652  INFO 7296 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.spring[email protected]138ecb8: startup date [Sat Mar 24 14:22:14 CST 2018]; root of context hierarchy
2018-03-24 14:22:15.246  INFO 7296 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2018-03-24 14:22:15.363  INFO 7296 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'configurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$ae4c8175] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)


  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.2.RELEASE)


2018-03-24 14:22:16.734  INFO 7296 --- [           main] com.springcloud.server.EurekaClient      : No active profile set, falling back to default profiles: default
2018-03-24 14:22:16.771  INFO 7296 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot

[email protected]11f401e: startup date [Sat Mar 24 14:22:16 CST 2018]; parent: org.spring[email protected]138ecb8
2018-03-24 14:22:17.664  INFO 7296 --- [           main] a.ConfigurationClassBeanDefinitionReader : Skipping bean definition for [BeanMethod:name=eurekaClient,declaringClass=org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration]: a definition for bean 'eurekaClient' already exists. This top-level bean definition is considered as an override.
2018-03-24 14:22:17.971  INFO 7296 --- [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=36ead521-829b-3457-bd51-79123615f5bd
2018-03-24 14:22:18.006  INFO 7296 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2018-03-24 14:22:18.146  INFO 7296 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$ae4c8175] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-03-24 14:22:19.036  INFO 7296 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8763 (http)
2018-03-24 14:22:19.052  INFO 7296 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
2018-03-24 14:22:19.053  INFO 7296 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.11
2018-03-24 14:22:19.327  INFO 7296 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2018-03-24 14:22:19.327  INFO 7296 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2556 ms
2018-03-24 14:22:19.598  INFO 7296 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2018-03-24 14:22:19.606  INFO 7296 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-03-24 14:22:19.607  INFO 7296 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-03-24 14:22:19.607  INFO 7296 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-03-24 14:22:19.607  INFO 7296 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-03-24 14:22:19.743  WARN 7296 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration$EurekaClientConfigurationRefresher': Unsatisfied dependency expressed through field 'autoRegistration'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eurekaAutoServiceRegistration' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.class]: Unsatisfied dependency expressed through method 'eurekaAutoServiceRegistration' parameter 2; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'eurekaRegistration' defined in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.class]: Unsatisfied dependency expressed through method 'eurekaRegistration' parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.netflix.discovery.EurekaClient' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
2018-03-24 14:22:19.744  INFO 7296 --- [           main] o.apache.catalina.core.StandardService   : Stopping service Tomcat
2018-03-24 14:22:19.855  INFO 7296 --- [           main] utoConfigurationReportLoggingInitializer : 


Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-03-24 14:22:20.162 ERROR 7296 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 


***************************
APPLICATION FAILED TO START
***************************


Description:


Parameter 0 of method eurekaRegistration in org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration required a bean of type 'com.netflix.discovery.EurekaClient' that could not be found.
- Bean method 'eurekaClient' not loaded because AnyNestedCondition 0 matched 2 did not; NestedCondition on EurekaClientAutoConfiguration.OnMissingRefreshScopeCondition.MissingScope @ConditionalOnMissingBean (types: org.springframework.cloud.autoconfigure.RefreshAutoConfiguration; SearchStrategy: all) found bean 'org.springframework.cloud.autoconfigure.RefreshAutoConfiguration'; NestedCondition on EurekaClientAutoConfiguration.OnMissingRefreshScopeCondition.MissingClass @ConditionalOnMissingClass found unwanted class 'org.springframework.cloud.context.scope.refresh.RefreshScope'


Action:


Consider revisiting the conditions above or defining a bean of type 'com.netflix.discovery.EurekaClient' in your configuration.

原因：

@EnableEurekaClient
@RestController
@SpringBootApplication
public class EurekaClient {
public static void main(String[] args) {
SpringApplication.run(EurekaClient.class, args);

    }

我的啟動類也叫EurekaClient與com.netflix.discovery.EurekaClientyou起衝突了。spring例項化bean時取得名字應該就是類名的縮寫，所以就例項化不了。而且最後一句也提示你有衝突了。Consider revisiting the conditions above or defining a bean of type 'com.netflix.discovery.EurekaClient' in your configuration.

我把啟動類改成EurekaClientApplication就好了