SpringCloud从入门到精通教程（一）- 服务的注册与发现(Eureka)

柔情只为你懂 2023-02-25 15:25 2阅读 0赞

# 需求背景 #

> 服务的注册与发现：Eureka

# Tips技术点 #

1.** **@EnableEurekaServer注解

*  启用Eureka服务注册发现功能

2. 配置application.yml中eureka属性值

# **代码演示** #

## 1. 项目目录结构 ##

**![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70][]**

## 2. pom.xml依赖组件 ##

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    
    	<artifactId>microservice-discovery-eureka</artifactId>
    	<packaging>jar</packaging>
    
    	<parent>
    		<groupId>com.minbo.cloud</groupId>
    		<artifactId>spring-cloud-microservice-study</artifactId>
    		<version>0.0.1-SNAPSHOT</version>
    	</parent>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.cloud</groupId>
    			<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    		</dependency>
    	</dependencies>
    </project>

## 3. application.yml配置文件 ##

server:
       port: 8761 # 指定该Eureka实例的端口
    eureka:
       instance:
          hostname: localhost # 指定该Eureka实例的主机名
       # 配置关闭自我保护，并按需配置Eureka Server清理无效节点的时间间隔
       server:
          enable-self-preservation: false
          eviction-interval-timer-in-ms: 4000
       # 通过eureka.client.registerWithEureka:false和fetchRegistry:false，来表明自己是一个eureka server
       client:
          registerWithEureka: false
          fetchRegistry: false
          serviceUrl:
             defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

## 4. 启动类 ##

添加@EnableEurekaServer注解

package com.minbo.cloud.study;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    /**
     * 使用Eureka做服务发现.
     */
    @SpringBootApplication
    @EnableEurekaServer
    public class EurekaApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(EurekaApplication.class, args);
    	}
    
    }

## 5. Eureka启动是否成功 ##

运行EurekaApplication类，访问地址是：[http://localhost:8761/][http_localhost_8761]，注意不是：[http://localhost:8761/eureka][http_localhost_8761_eureka]

此界面，可以看到一些系统状态数据：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70 1][]

表示Eureka启动成功了。

Application显示No instances available，表示当前还没有服务提供者注册进来。

额外，此界面还可以看到一些服务器配置信息：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70 2][]

# 完整源码下载 #

我的[Github源码地址：][Github]

[https://github.com/hemin1003/spring-cloud-study/tree/master/spring-cloud-greenwich/microservice-discovery-eureka][https_github.com_hemin1003_spring-cloud-study_tree_master_spring-cloud-greenwich_microservice-discovery-eureka]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70 3][]

# 下一章教程 #

[SpringCloud从入门到精通教程（二）- 服务提供者][SpringCloud_-]

# 该系列教程 #

[SpringCloud从入门到精通教程][SpringCloud]

# 我的专栏 #

*  [SpringBoot系列专栏][SpringBoot]
 *  [SpringCloud系列专栏][SpringCloud]
 *  [高可用高并发实战][Link 1][专栏][Link 2]
 *  [微服务架构实战][Link 3]
 *  [DevOps实战专栏][DevOps]
 *  [程序化广告实战专栏][Link 2]

至此，全部介绍就结束了

\-------------------------------

[我的CSDN主页][CSDN]

[关于我][Link 4]（个人域名）

[我的开源项目集Github][Github 1]

期望和大家***一起学习，一起成长***，共勉，O(∩\_∩)O谢谢

欢迎交流问题，可加个人QQ 469580884，

或者，加我的群号 **751925591**，一起探讨交流问题

不讲虚的，只做实干家

Talk is cheap，show me the code

![20180411181545874][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70]: /images/20230209/c8ffe5b6c3df4f52a5490a39f9110ef7.png
[http_localhost_8761]: http://localhost:8761/
[http_localhost_8761_eureka]: http://localhost:8761/eureka
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70 1]: /images/20230209/000fa24727f24386a32a45cf8120874f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70 2]: /images/20230209/dbb9212aa7b84ae3b4eea7592db8a30a.png
[Github]: https://github.com/hemin1003/spring-cloud-study/tree/master/spring-cloud-greenwich/
[https_github.com_hemin1003_spring-cloud-study_tree_master_spring-cloud-greenwich_microservice-discovery-eureka]: https://github.com/hemin1003/spring-cloud-study/tree/master/spring-cloud-greenwich/microservice-discovery-eureka
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hlbWluMTAwMw_size_16_color_FFFFFF_t_70 3]: /images/20230209/222cbffabb184dd7964780f16a5022ce.png
[SpringCloud_-]: https://hemin.blog.csdn.net/article/details/107319172
[SpringCloud]: https://blog.csdn.net/hemin1003/category_9293625.html
[SpringBoot]: https://blog.csdn.net/hemin1003/article/category/9291077
[Link 1]: https://blog.csdn.net/hemin1003/article/category/9292134
[Link 2]: https://blog.csdn.net/hemin1003/article/category/9290971
[Link 3]: https://blog.csdn.net/hemin1003/article/category/9292162
[DevOps]: https://blog.csdn.net/hemin1003/article/category/9292130
[CSDN]: https://blog.csdn.net/hemin1003
[Link 4]: http://heminit.com/about/
[Github 1]: https://github.com/hemin1003
[20180411181545874]: /images/20230209/b84e2b6f32554cfda7afc8590733125e.png