SpringCloud之高可用的分布式配置中心(Spring Cloud Config)（七）

准备工作

<?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>

<groupId>com.forezp</groupId>

<artifactId>config-server</artifactId>

<version>0.0.1-SNAPSHOT</version>

<packaging>jar</packaging>

<name>config-server</name>

<description>Demo project for Spring Boot</description>

<parent>

<groupId>com.forezp</groupId>

<artifactId>sc-f-chapter7</artifactId>

<version>0.0.1-SNAPSHOT</version>

</parent>

<dependencies>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-config-server</artifactId>

</dependency>

</dependencies>

<build>

<plugins>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>

</project>

server:

port: 8889

eureka:

instance:

hostname: localhost

client:

registerWithEureka: false

fetchRegistry: false

serviceUrl:

defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/[/code] 入口类：

@EnableEurekaServer

@SpringBootApplication

public class EurekaServerApplication {

public static void main(String[] args) {

SpringApplication.run(EurekaServerApplication.class, args);

}

}


二、改造config-server
在其pom.xml文件加上EurekaClient的起步依赖spring-cloud-starter-netflix-eureka-client，代码如下:

<dependencies>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-config-server</artifactId>

</dependency>

</dependencies>

配置文件application.yml，指定服务注册地址为http://localhost:8889/eureka/，其他配置同上一篇文章，完整的配置如下：

spring.application.name=config-server

server.port=8888

spring.cloud.config.server.git.uri=https://github.com/forezp/SpringcloudConfig/

spring.cloud.config.server.git.searchPaths=respo

spring.cloud.config.label=master

spring.cloud.config.server.git.username= your username

spring.cloud.config.server.git.password= your password

eureka.client.serviceUrl.defaultZone=http://localhost:8889/eureka/

最后需要在程序的启动类Application加上@EnableEureka的注解。

三、改造config-client
将其注册微到服务注册中心，作为Eureka客户端，需要pom文件加上起步依赖spring-cloud-starter-netflix-eureka-client，代码如下：

<dependencies>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-config</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

</dependency>

<dependency>

<groupId>org.springframework.cloud</groupId>

<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

</dependency>

</dependencies>

配置文件bootstrap.properties，注意是bootstrap。加上服务注册地址为http://localhost:8889/eureka/

spring.application.name=config-client

spring.cloud.config.label=master

spring.cloud.config.profile=dev

#spring.cloud.config.uri= http://localhost:8888/ 
eureka.client.serviceUrl.defaultZone=http://localhost:8889/eureka/

spring.cloud.config.discovery.enabled=true

spring.cloud.config.discovery.serviceId=config-server

server.port=8881


spring.cloud.config.discovery.enabled 是从配置中心读取文件。欢迎大家一起学习研究相关技术愿意了解源码的朋友直接求求交流分享技术：2147775633

spring.cloud.config.discovery.serviceId 配置中心的servieId，即服务名。

这时发现，在读取配置文件不再写ip地址，而是服务名，这时如果配置服务部署多份，通过负载均衡，从而高可用。

依次启动eureka-servr,config-server,config-client 访问网址：http://localhost:8889/查看返回的结果说明高可用的效果达到了。