概述
在分布式系统中，由于数量巨多，为了方便服务配置文件统一管理，实时更新，所以需要分布式配置中心组建。在 Spring Cloud 中，有分布式配置中心组件 Spring Cloud Config，它支持配置服务放在配置服务的内存中（即本地），也支持放在远程 Git 仓库中。在 Spring Cloud Config 组件中，分两个角色，一是 Config Server，二是 Config Client。
创建工程名为 hello-spring-cloud-config 的项目，pom.xml 配置文件如下：
<?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> <parent> <groupId>com.ycq</groupId> <artifactId>hello-spring-cloud-dependencies</artifactId> <version>1.0.0-SNAPSHOT</version> <relativePath>../hello-spring-cloud-dependencies/pom.xml</relativePath> </parent> <artifactId>hello-spring-cloud-config</artifactId> <packaging>jar</packaging> <name>hello-spring-cloud-config</name> <dependencies> <!-- Spring Boot Begin --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- Spring Boot End --> <!-- Spring Cloud Begin --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config-server</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <!-- Spring Cloud End --> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <mainClass>com.ycq.hello.spring.cloud.config.ConfigApplication</mainClass> </configuration> </plugin> </plugins> </build> </project>
主要增加了 spring-cloud-config-server 依赖
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config-server</artifactId> </dependency>
Application
通过 @EnableConfigServer 注解，开启配置服务器功能
package com.ycq.hello.spring.cloud.config; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.config.server.EnableConfigServer; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient @EnableConfigServer public class ConfigApplication { public static void main(String[] args) { SpringApplication.run(ConfigApplication.class, args); } }
application.yml
增加 Config 相关配置，并设置端口号为：8888
spring: application: name: hello-spring-cloud-config cloud: config: label: master server: git: uri: https://github.com/xxxxxxx/spring-cloud-config search-paths: respo username: password: server: port: 8888 eureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/
相关配置说明，如下：
spring.cloud.config.label：配置仓库的分支spring.cloud.config.server.git.uri：配置 Git 仓库地址（GitHub、GitLab、码云...）spring.cloud.config.server.git.search-paths：配置仓库路径（存放配置文件的目录）spring.cloud.config.server.git.username：访问 Git 仓库的账号spring.cloud.config.server.git.password：访问 Git 仓库的密码
注意事项：
- 如果使用 GitLab 作为仓库的话，
git.uri需要在结尾加上.git，GitHub 则不用
测试
浏览器端访问：http://localhost:8888/config-client/dev/master 显示如下：
<Environment> <name>config-client</name> <profiles> <profiles>dev</profiles> </profiles> <label>master</label> <version>9646007f931753d7e96a6dcc9ae34838897a91df</version> <state/> <propertySources> <propertySources> <name>https://github.com/xxxxx/spring-cloud-config/respo/config-client-dev.yml</name> <source> <foo>foo version 1</foo> <demo.message>Hello Spring Config</demo.message> </source> </propertySources> </propertySources> </Environment>
证明配置服务中心可以从远程程序获取配置信息
附：HTTP 请求地址和资源文件映射
- http://ip:port/{application}/{profile}[/{label}]
- http://ip:port/{application}-{profile}.yml
- http://ip:port/{label}/{application}-{profile}.yml
- http://ip:port/{application}-{profile}.properties
- http://ip:port/{label}/{application}-{profile}.properties
