SpringCloud-Spring Cloud Config分

分布式配置中心可以理解成 注册中心+配置中心的整合。具体实现思路：搭建一个注册中心，在注册中心的基础上添加配置中心。

注册中心搭建

• maven配置

<groupId>com.wk.sc</groupId>
    <artifactId>springcloud-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/>
    </parent>

    <dependencies>
          <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-server</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

• application.yml配置

server:
  port: 6062

eureka:
  instance:
    hostname: localhost
  client:
    fetch-registry: false # 禁止拉取服务注册列表
    register-with-eureka: false  # 禁止当前服务注册
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ # 定义服务注册地址

• 启动类

@EnableEurekaServer  //开启服务注册
@SpringBootApplication
public class ConfigServerCluster1Application {

    public static void main(String[] args) {
        SpringApplication.run(ConfigServerCluster1Application.class, args);
    }

}

配置中心

• maven配置

<groupId>com.wk.sc</groupId>
    <artifactId>springcloud-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/>
    </parent>

    <dependencies>
          <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>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

• application.yml配置

server:
  port: 6063
spring:
  application:
    name: config-server-2
  cloud:
    config:
      server:
        git:
          uri: https://gitee.com/umeone/springcloud-config.git  # 配置文件存放git地址
          search-paths: pro-test # 配置文件存放路径(文件夹)，如果配置文件在项目根目录，则不需要配置该值
          username: zpwd63@qq.com  # git账号  当git项目创建为public时，不需要username和password
          password: gi891023881225 # git密码
      label: master # git配置文件所在分支
eureka:
  client:
    service-url:
      defaultZone: http://localhost:6062/eureka/   # 配置注册中心地址

• 启动类

@EnableEurekaClient  //注意此处需要同时开启注册中心和配置服务
@EnableConfigServer
@SpringBootApplication
public class ConfigServerCluster2Application {

    public static void main(String[] args) {
        SpringApplication.run(ConfigServerCluster2Application.class, args);
    }

}

客户端配置

• maven配置

<groupId>com.wk.sc</groupId>
    <artifactId>springcloud-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/>
    </parent>

    <dependencies>
          <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
           <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <!--配置中心集群需要添加以下依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

• bootstrap.yml配置

#  注意此配置文件名为bootstrap.yml,而不是application.yml  后者不是默认读取文件名
server:
  port: 6061

spring:
  application:
    name: config-client
  cloud:
    config:
      label: master # 指定分支
      profile: dev # 指定环境， 和配置文件后缀dev一致
      uri: http://localhost:6063/  # 配置服务中心地址
      name: config-client

      # spring.cloud.config.name 值和配置文件的名称保持一定规则。如此处名称，在git中的配置文件名应为config-client-dev.properties ，前缀保持一致，后面的dev为不同环境的区分，这个规则和Springboot配置文件的环境区分类似。
      # 如果该值没有配置，项目启动时会取spring.application.name值作为默认值（这仅仅是个猜测，通过更改name值进行测试，没有查看源码实现，要想确定是否猜测正确，需要从源码进行确认）
      # URL与配置文件的映射关系：
      # /{application}/{profile}[/{label}]
      # /{application}-{profile}.yml
      # /{label}/{application}-{profile}.yml
      # /{application}-{profile}.properties
      # /{label}/{application}-{profile}.properties

      ##  以下为配置高可用配置中心配置信息
      discovery:
        enabled: true  # 启用从配置中心读取数据
        service-id: config-server-2  # 服务名称
eureka:
  client:
    service-url:
      defaultZone: http://localhost:6062/eureka/   # 服务注册地址

同样需要这里的配置文件名为：bootstrap.yml

• 启动类

@EnableEurekaClient  //开启服务发现
@RestController
@SpringBootApplication
public class ConfigClientApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConfigClientApplication.class, args);
    }

    @Value("${file}")  //如果配置中心获取失败则项目启动报错
    private String file;
    @Value("${word}")
    private String word;

    @RequestMapping(value = "/test")
    public String test() {
        return file + ":" + word;
    }
}

分布式配置中心在配置信息的时候需要保持思路清新，特别是在配置对应配置中心地址和注册中心地址时，不要混淆这些地址。