Spring Cloud（2）A Eureka server端 服务注册建立

1. 父项目pom

　　　<dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-dependencies</artifactId>
      <version>Greenwich.RELEASE</version>
      <type>pom</type>
    </dependency>


    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-dependencies</artifactId>
      <version>2.1.3.RELEASE</version>
      <type>pom</type>
      <scope>provided</scope>
    </dependency>

2.Eureka pom

       <dependencies>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>    
        
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>

3. yml 配置

server:
  port: 7001

eureka:
  instance:
    hostname: localhost  #eureka服务器的实例名称
  client:
    register-with-eureka: false  #表示不想注册中心注册自己
    fetch-registry: false  #表示自己就是注册中心
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/    #设置与eureka server交互的地址查询服务

客户端向服务端每30s 发送一次心跳，90s 之后客户端如果没有发送心跳，Service 会去除这个客户端

4.启动类

package com.service;

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

@SpringBootApplication
@EnableEurekaServer  //服务器启动类,接受其他微服务注册进来
public class Dept_Eureka {

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