SpringCloud教程 | 第8篇:分布式配置中心(Spring Cloud Config) 服务端

一、简介

在分布式系统中，由于服务数量巨多，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件。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。

二、构建Config Server

     1.创建一个spring-boot项目，取名为microservicecloud-config-server其pom.xml:

<?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">
    <parent>
        <artifactId>mall</artifactId>
        <groupId>com.linjia</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-config-server</artifactId>

    <name>microservicecloud-config-server</name>
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <!-- springCloud Config -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
        <!-- 避免Config的Git插件报错：org/eclipse/jgit/api/TransportConfigCallback -->
        <dependency>
            <groupId>org.eclipse.jgit</groupId>
            <artifactId>org.eclipse.jgit</artifactId>
            <version>4.10.0.201712302008-r</version>
        </dependency>
        <!-- 图形化监控 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- 熔断 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <!-- 热部署插件 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>
    <build>

        <finalName>${name}</finalName> <!-- 打包jar名称-->
        <plugins>
            <plugin><!-- 打包可运行的jar  -->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>
</project>

 2. yml配置

server: 
  port: 3344 
  
spring:
  application:
    name:  microservicecloud-config-server
  cloud:
    config:
      server:
        git:
          uri: [email protected]:yangliuwilow/springcloud-config.git #GitHub上面的git仓库名字
 

3.启动类，在程序的入口Application类加上@EnableConfigServer注解开启配置服务器的功能

package com.linjia.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

@SpringBootApplication
@EnableConfigServer
public class ConfigApplication
{
	public static void main(String[] args)
	{
		SpringApplication.run(ConfigApplication.class, args);
	}
}

4.git远程仓库： https://github.com/yangliuwilow/ 创建名称为：springcloud-config的 repositories

      springcloud-config 下创建配置文件 application.yml

    内容如下： 

spring: 
   profiles: 
     active: 
     - dev

---
spring:
   profiles: dev  #开发环境
   application: 
     name: dept-config-dev
---
spring:
   profiles: test   #测试环境
   application: 
     name: dept-config-test
#  另存为UTF-8 格式

配置完成，启动application

访问：http://localhost:3344/application-dev.yml

返回结果：

spring:
  application:
    name: dept-config-dev
  profiles:
    active:
    - dev