Spring Cloud入門實戰(二)--集成Eureka

前言

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正在入門SpringCloud中，在學習的過程中也正好做個項目練手。這個項目是想做成一個模板，這樣之後遇到同規模項目的時候可以拿來就用，版本也好控制。涉及到的中間件會有Eureka、Ribbon、Feign、HyStrix、Zuul、ConfigServer。這一節將項目改裝成Spring Cloud並集成Eureka。
版本
SpringBoot：2.2.1.RELEASE
Spring Cloud：Finchley.RS1
Eureka：2.2.1.RELEASE
目錄結構

1、如果商品微服務的ip地址發生了變更，訂單微服務中的配置文件也需要跟着修改
2、如果商品微服務有多個，那麼在訂單微服務中又該如何寫地址？
因此引入註冊中心用來管理接口配置

文章目錄

二、Eureka客戶端服務發現配置

生產者配置

消費者配置

一、Eureka服務註冊中心配置

在項目pom文件中加入SpringCloud管理依賴

  <dependencyManagement>
    <dependencies>
      <!-- 導入Spring Cloud的依賴管理 -->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Finchley.RS1</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

在eureka模塊pom中加入eureka依賴

<dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--springboot 整合eureka服務端-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>2.2.1.RELEASE</version>
        </dependency>
    </dependencies>

在這一塊就卡了很久，會出現以下報錯，這個錯誤到最後我也沒解決，之後就換了版本，新建了個maven倉庫。
（一）需要注意的是SpringBoot的版本和eureka的版本有關聯，比如我原先用的2.2.1的SpringBoot和1.4.3的eureka會有如下報錯

（二）不管springcloud還是springboot版本我都換了很多次，都是出現這個問題，新建了個maven倉庫就解決了，判斷應該是eureka中jersey出現了版本衝突。

2020-04-09 11:05:11.146  INFO 13864 --- [           main] com.hofe.EurekaApplication               : No active profile set, falling back to default profiles: default
2020-04-09 11:05:12.091  WARN 13864 --- [           main] o.s.boot.actuate.endpoint.EndpointId     : Endpoint ID 'service-registry' contains invalid characters, please migrate to a valid format.
2020-04-09 11:05:12.263  INFO 13864 --- [           main] o.s.cloud.context.scope.GenericScope     : BeanFactory id=e29d8b1a-b705-3aaa-acfe-1ff43115d358
2020-04-09 11:05:12.422  INFO 13864 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$4b153431] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-04-09 11:05:12.720  INFO 13864 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 7999 (http)
2020-04-09 11:05:12.733  INFO 13864 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-04-09 11:05:12.733  INFO 13864 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.27]
2020-04-09 11:05:12.974  INFO 13864 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-04-09 11:05:12.975  INFO 13864 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1811 ms
2020-04-09 11:05:13.069  WARN 13864 --- [           main] c.n.c.sources.URLConfigurationSource     : No URLs will be polled as dynamic configuration sources.
2020-04-09 11:05:13.069  INFO 13864 --- [           main] c.n.c.sources.URLConfigurationSource     : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2020-04-09 11:05:13.076  INFO 13864 --- [           main] c.netflix.config.DynamicPropertyFactory  : DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration@12d1f1d4
2020-04-09 11:05:13.390 ERROR 13864 --- [           main] o.s.b.web.embedded.tomcat.TomcatStarter  : Error starting Tomcat context. Exception: org.springframework.beans.factory.BeanCreationException. Message: Error creating bean with name 'jerseyFilterRegistration' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.FilterRegistrationBean]: Factory method 'jerseyFilterRegistration' threw exception; nested exception is java.lang.NoClassDefFoundError: com/sun/jersey/spi/container/servlet/ServletContainer
2020-04-09 11:05:13.420  INFO 13864 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2020-04-09 11:05:13.427  WARN 13864 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
2020-04-09 11:05:13.443  INFO 13864 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-04-09 11:05:13.457 ERROR 13864 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at com.hofe.EurekaApplication.main(EurekaApplication.java:15) [classes/:na]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:88) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:438) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:191) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	... 8 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jerseyFilterRegistration' defined in class path resource [org/springframework/cloud/netflix/eureka/server/EurekaServerAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.FilterRegistrationBean]: Factory method 'jerseyFilterRegistration' threw exception; nested exception is java.lang.NoClassDefFoundError: com/sun/jersey/spi/container/servlet/ServletContainer
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:645) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:625) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:211) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.getOrderedBeansOfType(ServletContextInitializerBeans.java:202) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.addServletContextInitializerBeans(ServletContextInitializerBeans.java:96) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.servlet.ServletContextInitializerBeans.<init>(ServletContextInitializerBeans.java:85) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getServletContextInitializerBeans(ServletWebServerApplicationContext.java:253) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.selfInitialize(ServletWebServerApplicationContext.java:227) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.springframework.boot.web.embedded.tomcat.TomcatStarter.onStartup(TomcatStarter.java:53) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5135) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_144]
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) ~[na:1.8.0_144]
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_144]
	at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134) ~[na:1.8.0_144]
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.apache.catalina.startup.Tomcat.start(Tomcat.java:459) ~[tomcat-embed-core-9.0.27.jar:9.0.27]
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:107) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	... 13 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.web.servlet.FilterRegistrationBean]: Factory method 'jerseyFilterRegistration' threw exception; nested exception is java.lang.NoClassDefFoundError: com/sun/jersey/spi/container/servlet/ServletContainer
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:640) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	... 53 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/sun/jersey/spi/container/servlet/ServletContainer
	at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration.jerseyFilterRegistration(EurekaServerAutoConfiguration.java:184) ~[spring-cloud-netflix-eureka-server-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration$$EnhancerBySpringCGLIB$$e48e3812.CGLIB$jerseyFilterRegistration$0(<generated>) ~[spring-cloud-netflix-eureka-server-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration$$EnhancerBySpringCGLIB$$e48e3812$$FastClassBySpringCGLIB$$b02b22.invoke(<generated>) ~[spring-cloud-netflix-eureka-server-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	at org.springframework.cloud.netflix.eureka.server.EurekaServerAutoConfiguration$$EnhancerBySpringCGLIB$$e48e3812.jerseyFilterRegistration(<generated>) ~[spring-cloud-netflix-eureka-server-2.1.2.RELEASE.jar:2.1.2.RELEASE]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_144]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_144]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_144]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_144]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
	... 54 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.sun.jersey.spi.container.servlet.ServletContainer
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_144]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_144]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) ~[na:1.8.0_144]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_144]
	... 65 common frames omitted


進程完成，退出碼 1

創建application.yml

server:
  port: 7999
spring:
  application:
    name: eureka-server
eureka:
###客戶端調用地址
  client:
    serviceUrl:
      defaultZone: http://localhost:7999/eureka/
###是否將自己註冊到Eureka服務中,因爲該應用本身就是註冊中心，不需要再註冊自己（集羣的時候爲true）
    register-with-eureka: false
###是否從Eureka中獲取註冊信息,因爲自己爲註冊中心,不會在該應用中的檢索服務信息
    fetch-registry: false

配置啓動類

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

/**
 * Eureka註冊中心
 */
@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }
}

啓動之後，訪問端口，即可登錄控制中心

二、Eureka客戶端服務發現配置

生產者配置

在模塊pom下加入依賴

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.2.1.RELEASE</version>
        </dependency>

在生產者中的application.yml配置以下信息

生產者中配置

server:
  port: 7900
spring:
  application:
    name: provider-user
eureka:
  client:
    service-url:
      defaultZone: http://localhost:7999/eureka/

在啓動類中增加註解@EnableEurekaClient

@SpringBootApplication
@EnableEurekaClient
public class ProviderUserApplication {

    public static void main( String[] args ) {
        SpringApplication.run(ProviderUserApplication.class, args);
    }
}

消費者配置

在模塊pom下加入依賴

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.2.1.RELEASE</version>
        </dependency>

在消費者的application中添加client

server:
  port: 7901
spring:
  application:
    name: consume-user
eureka:
  client:
    service-url:
      defaultZone: http://localhost:7999/eureka/

修改消費者的UserController

@Autowired
    private EurekaClient eurekaClient;

    private RestTemplate restTemplate = new RestTemplate();

    @GetMapping("getUserByEureka/{id}")
    public User getUser(@PathVariable Long id){
        InstanceInfo info = eurekaClient.getNextServerFromEureka("PROVIDER-USER", false);
        String homePageUrl = info.getHomePageUrl();
        User user = restTemplate.getForObject(homePageUrl+"/user/"+id, User.class);
        return user;
    }

在啓動類中添加註解@EnableEurekaClient

@SpringBootApplication
@EnableEurekaClient
public class ConsumeUserApplicaton {

    public static void main( String[] args ) {
        SpringApplication.run(ConsumeUserApplicaton.class, args);
    }
}

三、開啓eureka服務器和客戶端

消費者訪問自己的端口7901的getUserByEureka/1得到用戶信息。

四、總結

版本對應很重要，可以通過https://spring.io/projects/spring-cloud來查看spring-cloud和SpringBoot的對應關係，以及Eureka的依賴包是否會發生衝突。消費者通過EurekaClient的getNextServerFromEureka方法動態獲取生產者的url，訪問消費者的url/getUserByEureka/1時，會從生產者的url/user/1中獲取。

Spring Cloud入門實戰(二)--集成Eureka

前言

文章目錄

一、Eureka服務註冊中心配置

在項目pom文件中加入SpringCloud管理依賴

在eureka模塊pom中加入eureka依賴

創建application.yml

配置啓動類

二、Eureka客戶端服務發現配置

生產者配置

在模塊pom下加入依賴

在生產者中的application.yml配置以下信息

在啓動類中增加註解@EnableEurekaClient

消費者配置

在模塊pom下加入依賴

在消費者的application中添加client

修改消費者的UserController

在啓動類中添加註解@EnableEurekaClient

三、開啓eureka服務器和客戶端

四、總結

druid數據源 xml配置

win10安裝ubuntu18.04雙系統

SpringBoot無法熱部署

Spring Cloud入門實戰(二)--集成Eureka

Spring Cloud入門項目實戰(三)--Ribbon

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