springcloud實戰之10 分散式配置中心（config）介紹瞭如何用spring cloud config和git倉庫讀取配置檔案，當配置檔案裡的屬性發生變化，按照以往的慣例，必須重啟服務才能夠讀取到新的配置屬性。但springcloud config為我們提供了springcloud bus（訊息匯流排）能夠實現動態重新整理配置檔案。

重構（springcloud-server-config）工程

新增依賴

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId
 
>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath />
</parent>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId
 
>spring-cloud-dependencies</artifactId>
            <version>Edgware.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
<dependencies>
    <dependency
 
>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-config-server</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-bus-amqp</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
</dependencies>

改造入口類

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

修改配置檔案

server:
  port: 8001
management:
  security:
    enabled: false
spring:
  application:
    name: springcloud-server-config
  cloud:
    config:
      server:
        git:
          uri: https://github.com/shiyuan2he/springcloud
          search-paths: springcloud-repo-config
          username:
          password:
          force-pull: true
      label: master
  rabbitmq:
    host: 192.168.175.128
    port: 5672
    username: admin
    password: admin
eureka:
  client:
    service-url:
      defaultZone: http://peer1:8080/eureka/

重構springcloud-service-config專案

新增依賴

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath />
</parent>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Edgware.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-config</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</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-bus-amqp</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
</dependencies>

重構入口類

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

改造web層介面

@RestController
@RefreshScope
@RequestMapping(value = "/api/rest")
public class RestfulController {

    @Value("${user.name}")
    String name;
    @Value("${user.age}")
    String age ;

    @GetMapping("/name")
    public String getName(){
        return name +":"+ age;
    }
}

新建配置檔案bootstrap.properties

spring.application.name=springcloud-service-config
spring.cloud.config.label=master
spring.cloud.config.profile=dev
spring.cloud.config.uri= http://localhost:8001/
server.port=8003

eureka.client.serviceUrl.defaultZone=http://peer1:8080/eureka/
## 從配置中心讀取檔案
spring.cloud.config.discovery.enabled=true
## 配置中心的servieId，即服務名。
spring.cloud.config.discovery.serviceId=springcloud-server-config
spring.cloud.config.fail-fast=true

spring.rabbitmq.host=192.168.175.128
spring.rabbitmq.port=5672
spring.rabbitmq.username=admin
spring.rabbitmq.password=admin

management.security.enabled=false

啟動專案

1.啟動服務註冊中心叢集（springcloud-server-eureka）

2.啟動服務配置中心（springcloud-server-config）

3.啟動springcloud-service-config叢集

啟動後的服務註冊圖如下:

分別呼叫兩個讀取配置檔案得叢集：

去github倉庫修改配置檔案，並訪問之前的叢集服務，還沒有立馬生效

再次檢視叢集服務，如下圖

原始碼

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