Eureka快速启动

2.编写配置文件

3.开启这个功能

4.配置类（通常需要，启动eureka不需要）

    org.springframework.cloud
    spring-cloud-starter-eureka-server
    1.4.7.RELEASE

server:
  port: 7001

eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: false #表示eureka是否向注册中心注册自己
    fetch-registry: false #false表示自己是注册中心
    service-url: #服务url地址
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

@EnableEurekaServer

Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.

没有开启自动配置功能