微服务深入浅出（8）-- 配置中心Spring Cloud Config

Config Server从本地读取配置文件

将所有的配置文件统一写带Config Server过程的目录下，Config Server暴露Http API接口，Config Client调用Config Server的Http API来读取配置文件

1、引入依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-config-server</artifactId>
</dependency>

2、启动类添加@EnableConfigServer注解

@EnableConfigServer
@SpringBootApplication
public class DemoApplication {

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

3、工程配置文件配置本地读取

spring:
  cloud:
    config:
      server:
        native:
          search-locations: classpath:/shared
  profiles:
    active: native
  application:
    name: config-server
server:
  port: 9001

4、创建共享配置文件config-client-dev.yml

server:
  port: 9002
foo: foo version 1

==========================

1、引入依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-config-server</artifactId>
</dependency>

2、bootstrap.yml作为程序的配置文件（bootstrap相对于application具有优先的执行顺序）

spring:
  application:
    name: config-client
  cloud:
    config:
      uri: http://localhost:9001
      fail-fast: true
  profiles:
    active: dev

这样的客户端程序已经在9002端口启动，也可以像本地文件一样读取远程的配置文件：

 @Value("${foo}")
    String foo;

    @GetMapping("/hi")
    public String hi() {
        return foo;
    }

Config Server从远程Git读取配置文件

spring:
  cloud:
    config:
      server:
        git:
          uri: https://github.com/forezp/springcloudConfig
          search-paths: respo
          username: aaa
          password: aaa
      label: master
  application:
    name: config-server

高可用Config Server集群

1、配置Eureka Server

<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>

server:
  port: 9003
eureka:
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://localhost:${server.port}/eureka

@EnableEurekaServer
@SpringBootApplication
public class DemoApplication {

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

2、改造config-server

spring:
  cloud:
    config:
      server:
        native:
          search-locations: classpath:/shared
  profiles:
    active: native
  application:
    name: config-server
server:
  port: 9001
eureka:
  client:
    service-url:
      defaultZone: http://localhost:9003/eureka

@EnableConfigServer
@SpringBootApplication
@EnableEurekaClient
public class DemoApplication {

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

3、改造config-client

spring:
  application:
    name: config-client
  cloud:
    config:
      fail-fast: true
      discovery:
        enabled: true
        service-id: config-server
  profiles:
    active: dev
server:
  port: 9002
eureka:
  client:
    service-url:
      defaultZone: http://localhost:9003/eureka

@SpringBootApplication
@RestController
@EnableEurekaClient
public class DemoApplication {

    @Value("${foo}")
    String foo;

    @GetMapping("/hi")
    public String hi() {
        return foo;
    }

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

Spring Cloud Bus刷新配置

 只需要改造config-client部分，消息驱动

1、引入依赖

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bus-amqp</artifactId>
        </dependency>

2、配置文件添加mq连接信息

spring:
  application:
    name: config-client
  cloud:
    config:
      fail-fast: true
      discovery:
        enabled: true
        service-id: config-server
  profiles:
    active: dev
  rabbitmq:
    host:
    port:
    username:
    password:
management:
  security:
    enabled: false

3、在需要更新的配置类添加@RefreshScope，只有添加了该注解，才会服务不重启的情况下更新配置

4、访问一个应用，http://localhost:9003/bus/refresh即可更新所有集成了config-client的应用的配置信息