3. 搭建服务注册中心

1.创建基础Spring Boot工程，命名为eureka-server，并在pom.xml中引入必要的依赖:

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>1.5.14.RELEASE</version>
  <relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-undertow</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
      <exclusion>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-tomcat</artifactId>
      </exclusion>
     </exclusions>
   </dependency>
   <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-eureka-server</artifactId>
   </dependency>
</dependencies>

2.@EnableEurekaServer注解启动一个服务注册中心:

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

        public static void main(String[] args) {

                SpringApplication.run(EurekaServerApplication.class, args);

        }

}

3.添加bootstrap.yum文件:

server:
  port: 8000
spring:
  application:
    name: eureka-server

4.添加application.yml配置文件:

eureka:
  instance:
    preferIpAddress: true
    leaseRenewalIntervalInSeconds: 10
    leaseExpirationDurationInSeconds: 30
  client:
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: ${EUREKA_DEFAULT_ZONE:http://localhost:8000/eureka/}
    registryFetchIntervalSeconds: 10
    disable-delta: true
  server:
    evictionIntervalTimerInMs: 4000

eureka.client.register-with-eureka: 设置是否向注册中心注册服务，因为本身为注册中心不需要注册自己。如果是注册中心集群则不需要此配置，默认为true。

eureka.client.fetch-registry: 设置是否去注册中心检索服务，因为本身为注册中心维护有服务列表不用去检索。如果为注册中心集群则不需此配置，默认为true。

eureka.client.serviceUrl.defaultZone: 注册中心地址

eureka.client.registryFetchIntervalSeconds: 间隔多久去拉取服务注册信息，默认30秒

4. 服务提供者

1.创建一个Spring Boot项目，命名为oauth-server，pom.xml如下:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-undertow</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

2.添加@EnableDiscoveryClent注解，开启服务发现功能:

@EnableEurekaClient
@SpringBootApplication
public class OauthServerApplication {

        public static void main(String[] args) {

                SpringApplication.run(OauthServerApplication.class, args);

        }
}

3.添加bootstrap.yml配置文件:

server:
  port: 8020
spring:
  application:
    name: oauth-server

4.添加applocation.yml文件:

eureka:
  client:
    serviceUrl:
      defaultZone: ${EUREKA_DEFAULT_ZONE:http://localhost:8000/eureka/}
    registryFetchIntervalSeconds: 10