spring cloud config可以用来作分布式配置中心，本质上configServer会从git / svn / 本地目录上下载到本地环境，EnvironmentController提供了一些了接口给ConfigClient启动时调用，EnvironmentController会返回本地缓存的配置文件给ConfigClient，从而实现分布式配置
具体规则可参照官网或EnvironmentController接口，个人喜好参照源码，有时文档会存在出入或羞涩

服务端配置：

spring.cloud.config.server.git.uri=https://github.com/rejoiceFromJesus/config-repo.git //git仓库位置
management.security.enabled=false//关闭安全验证
spring.cloud.config.server.git.basedir=target/config //加载到ConfigServer项目所在的本地目录的位置
spring.cloud.config.server.git.search-paths=configclient //本地目录搜索路径

因此最终访问的绝对路径是spring.cloud.config.server.git.basedir+spring.cloud.config.server.git.search-paths，这样有个缺点是不能在Client客户端指定搜索的目录

1、创建git仓库,然后创建2个配置文件

image

2个文件的内容分别为：

com.jiongyi.constant.active=dev

和

com.jiongyi.constant.active=test

tips:将会展现不同的环境加载不同的配置文件

2、创建父工程

pom.xml

<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.jiongyi.springboot</groupId>  
    <artifactId>jiongyi-springboot</artifactId>  
    <parent>  
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-parent</artifactId>  
        <version>1.5.1.RELEASE</version>  
    </parent>  
    <version>0.0.1-SNAPSHOT</version>  
  
    <packaging>pom</packaging>  
    <modules>  
        <module>spring-boot-config-server</module>  
        <module>spring-boot-configclient</module>  
    </modules>  
  
    <properties>  
        <main.basedir>${basedir}/..</main.basedir>  
        <java.version>1.8</java.version>  
    </properties>  
      
        <dependencyManagement>  
        <dependencies>  
            <dependency>  
                <groupId>org.springframework.cloud</groupId>  
                <artifactId>spring-cloud-dependencies</artifactId>  
                <version>Brixton.RELEASE</version>  
                <type>pom</type>  
                <scope>import</scope>  
            </dependency>  
        </dependencies>  
    </dependencyManagement>  
  
    <dependencies>  
  
  
        <!-- 监控 -->  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-actuator</artifactId>  
        </dependency>  
        <!-- spring boot starter -->  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter</artifactId>  
            <exclusions>  
                <exclusion>  
                    <groupId>org.springframework.boot</groupId>  
                    <artifactId>spring-boot-starter-logging</artifactId>  
                </exclusion>  
            </exclusions>  
        </dependency>  
        <!-- log4j2 -->  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-log4j2</artifactId>  
        </dependency>  
        <dependency>  <!-- 加上这个才能辨认到log4j2.yml文件 -->  
            <groupId>com.fasterxml.jackson.dataformat</groupId>  
            <artifactId>jackson-dataformat-yaml</artifactId>  
        </dependency>  
        <dependency>  
            <groupId>org.apache.logging.log4j</groupId>  
            <artifactId>log4j-nosql</artifactId> <!-- 必需，否则报错 -->  
            <version>2.7</version>  
        </dependency>  
        <!-- test -->  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-test</artifactId>  
            <scope>import</scope>  
        </dependency>  
        <!-- 配置提示 -->  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-configuration-processor</artifactId>  
            <optional>true</optional>  
        </dependency>  
    </dependencies>  
    <build>  
        <plugins>  
            <plugin>  
                <groupId>org.springframework.boot</groupId>  
                <artifactId>spring-boot-maven-plugin</artifactId>  
            </plugin>  
        </plugins>  
        <!-- <resources> <resource> <directory>src/main/resources</directory> <excludes>   
            <exclude>*.properties</exclude> </excludes> </resource> </resources> -->  
    </build>  
  
</project>  

3、创建子工程configserver，代表服务端，负责加载配置文件到本地

pom.xml

<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.jiongyi.springboot</groupId>  
        <artifactId>jiongyi-springboot</artifactId>  
        <version>0.0.1-SNAPSHOT</version>  
    </parent>  
    <artifactId>spring-boot-config-server</artifactId>  
  
  
  
    <dependencies>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-config-server</artifactId>  
        </dependency>  
    </dependencies>  
  
</project>  

ConfigServer.java 启动类

package com.jiongyi.springboot.configserver;  
  
import java.io.FileNotFoundException;  
  
import org.springframework.boot.SpringApplication;  
import org.springframework.boot.autoconfigure.SpringBootApplication;  
import org.springframework.cloud.config.server.EnableConfigServer;  
  
@SpringBootApplication  
@EnableConfigServer  
public class ConfigServer {  
  public static void main(String[] args) throws FileNotFoundException {  
    SpringApplication.run(ConfigServer.class, args);  
  }  
}

application.properties 配置文件

server.port=8888  
spring.cloud.config.server.git.uri=https://github.com/rejoiceFromJesus/config-repo.git  
management.security.enabled=false  
spring.cloud.config.server.git.basedir=target/config  #git的配置文件会加载到本地的目录  
spring.cloud.config.uri=http://localhost:8888 

4、创建子工程configclient客户端，配置文件将从configserver获取

pom.xml

<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.jiongyi.springboot</groupId>  
        <artifactId>jiongyi-springboot</artifactId>  
        <version>0.0.1-SNAPSHOT</version>  
    </parent>  
    <artifactId>spring-boot-configclient</artifactId>  
  
    <dependencies>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-config-client</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-web</artifactId>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-config-server</artifactId>  
            <scope>test</scope>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-test</artifactId>  
            <scope>test</scope>  
        </dependency>  
    </dependencies>  
  
</project> 

application.properties

server.port=8080  
spring.cloud.config.uri=http://localhost:8888  
spring.application.name=configclient #代表当前服务的名称，会与configclient-{profile}.properties相对应  
spring.config.name=configserver  
spring.cloud.config.profile=dev  //将会激活dev，从而访问http://localhost:8080/configclient/active，响应：<span style="font-family:'Microsoft YaHei';font-size:14px;">hello i am dev</span>  

ConstantProperties.java 用来读取配置文件的值，激活的profile不同，值不同

package com.jiongyi.springboot.configclient;  
  
import org.springframework.boot.context.properties.ConfigurationProperties;  
import org.springframework.context.annotation.Configuration;  
  
@Configuration  
@ConfigurationProperties(prefix="com.jiongyi.constant")  
public class ConstantProperties {  
  
    public String active;  
  
    public String getActive() {  
        return active;  
    }  
  
    public void setActive(String active) {  
        this.active = active;  
    }  
  
      
}  

HelloController.java

package com.jiongyi.springboot.configclient;  
  
import org.springframework.beans.factory.annotation.Autowired;  
import org.springframework.web.bind.annotation.RequestMapping;  
import org.springframework.web.bind.annotation.RequestMethod;  
import org.springframework.web.bind.annotation.RestController;  
  
@RestController  
@RequestMapping("configclient")  
public class HelloController {  
  
    @Autowired  
    ConstantProperties constantProperties;  
      
    @RequestMapping(value="active",method={RequestMethod.GET})  
    public String hello(){  
        return "hello i am "+constantProperties.getActive();//返回当前激活的环境  
    }  
      
}  

ConfigClient.java 客户端启动类

package com.jiongyi.springboot.configclient;  
  
import org.springframework.boot.SpringApplication;  
import org.springframework.boot.autoconfigure.SpringBootApplication;  
  
@SpringBootApplication  
public class ConfigClient {  
  public static void main(String[] args) {  
    SpringApplication.run(ConfigClient.class, args);  
  }  
}  

测试：浏览器访问http://localhost:8080/configclient/active，若是激活dev，输出hello i am dev ,激活test，输出hello i am test