Spring Cloud（十四）Config 分布式配置中心

爱被打了一巴掌 2022-11-25 11:59 150阅读 0赞

**Table of Contents**

1.Config  介绍

2.github 上存放配置文件

3.服务端构建

1.pom.xml中添加依赖

2.代码实现

3.访问规则

4.客户端构建

1.pom.xml中添加依赖

2.代码实现

3.动态刷新配置现

--------------------

## 1.Config  介绍 ##

[https://spring.io/projects/spring-cloud-config\#overview][https_spring.io_projects_spring-cloud-config_overview]

[https://github.com/akeung/springclouddemo-config][https_github.com_akeung_springclouddemo-config]

Spring Cloud Config为分布式系统中的外部化配置提供服务器和客户端支持。使用Config Server，您可以集中管理所有环境中应用程序的外部属性。客户端和服务器上的概念与Spring `Environment`和`PropertySource`抽象，因此它们非常适合Spring应用程序，但可以与以任何语言运行的任何应用程序一起使用。当应用程序从开发人员到测试人员进入生产过程进入生产过程时，您可以管理这些环境之间的配置，并确保应用程序具有它们迁移时所需的一切。服务器存储后端的默认实现使用git，因此它轻松支持配置环境的带标签的版本，并且可用于管理内容的各种工具。添加替代实现并将其插入Spring配置很容易。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjAzMjE5OQ_size_16_color_FFFFFF_t_70][]

## ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjAzMjE5OQ_size_16_color_FFFFFF_t_70 1][] ##

## 2.github 上存放配置文件 ##

[https://github.com/akeung/springclouddemo-config][https_github.com_akeung_springclouddemo-config]

![2020080911462597.png][]

## 3.服务端构建 ##

**config-center-3344**

### 1.pom.xml中添加依赖 ###

![20200809104220409.png][]

<dependencies>
            
            <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>
            <dependency>
                <groupId>com.ak.demo</groupId>
                <artifactId>api-commons</artifactId>
                <version>${project.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
        </dependencies>

### 2.代码实现 ###

**yml文件配置**

server:
      port: 3344
    
    spring:
      application:
        name: config-center
      cloud:
        config:
          server:
            git:
              uri: https://github.com/akeung/springclouddemo-config
              search-paths:
                - springclouddemo-config #搜索目录
          label: master #读取分支
    
    eureka:
      client:
        register-with-eureka: true #表示向注册中心注册自己 默认为true
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/

**主启动类**

@EnableDiscoveryClient
    @EnableConfigServer
    @SpringBootApplication
    public class ConfigCenter3344 {
        public static void main(String[] args) {
            SpringApplication.run(ConfigCenter3344.class,args);
        }
    }

### 3.访问规则 ###

[https://docs.spring.io/spring-cloud-config/docs/2.2.4.RELEASE/reference/html/][https_docs.spring.io_spring-cloud-config_docs_2.2.4.RELEASE_reference_html]

**访问规则：通过这套规则在浏览器上直接访问**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjAzMjE5OQ_size_16_color_FFFFFF_t_70 2][]

\#http://localhost:3344/config/dev/master  
/\{application\}/\{profile\}\[/\{label\}\]

\#http://localhost:3344/config-dev.yml  
/\{application\}-\{profile\}.yml

\#http://localhost:3344/master/config-dev.yml  
/\{label\}/\{application\}-\{profile\}.yml

\#http://localhost:3344/config-dev.properties   
/\{application\}-\{profile\}.properties

\#http://localhost:3344/master/config-dev.properties   
/\{label\}/\{application\}-\{profile\}.properties

![20200809113114125.png][]

## 4.客户端构建 ##

**config-client-3370**

### 1.pom.xml中添加依赖 ###

<dependencies>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-config</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
            <dependency>
                <groupId>com.ak.demo</groupId>
                <artifactId>api-commons</artifactId>
                <version>${project.version}</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
        </dependencies>

### 2.代码实现 ###

**bootstrap..yml文件配置**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjAzMjE5OQ_size_16_color_FFFFFF_t_70 3][]

**applicaiton.yml 是用户级的资源配置项  
bootstrap.yml 是系统级的,优先级更加高**

Spring Cloud会创建一个"**Bootstrap Context**" ,作为Spring应用的**Application Context**的父上下文。初始化的时候,\`BootstrapContext负责从外部源加载配置属性并解析配置,这两个上下文共享一个从外部获取的Environment.

**Bootstrap属性有高优先级,默认情况下,它们不会被本地配置覆盖**。Bootstrap context和Application Context有着不同的约定,所以新增了一个bootstrap.yml文件,保证Bootstrap Context和Application Context配置的分离

要将Client模块下的application.yml文件改为bootstrap.yml,这是很关键的。  
**因为bootstrap.yml是比application.yml先加载的. bootstrap.yml优先级高于application.ym**

server:
      port: 3370
    
    spring:
      application:
        name: config-client
      cloud:
        config: #根据访问配置中心的访问规则配置
          label: master #读取分支
          name: config #配置文件名称
          profile: dev #后缀名称
          uri: http://localhost:3344 #配置中心地址
    
    eureka:
      client:
        register-with-eureka: true #表示向注册中心注册自己 默认为true
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/

**主启动类**

@EnableDiscoveryClient
    @EnableEurekaClient
    @SpringBootApplication
    public class ConfigClient3370 {
        public static void main(String[] args) {
            SpringApplication.run(ConfigClient3370.class,args);
        }
    }

**测试**

@RestController
    public class ConfigClientController {
    
        @Value("${config.info}")
        private String configInfo;
    
        @GetMapping("config/info")
        public String getConfigInfo() {
            return configInfo;
        }
    }

### 3.动态刷新配置现 ###

当github上更新配置后，我们的服务要重新启动才能使用新的配置，否则配置无法生效。故需要 动态的修改配置。

1.必须依赖

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>

2.修改yml,暴露监控端口

#暴露监控端点
    management:
      endpoints:
        web:
          exposure:
            include: refresh
    #        include: "*"

3.@RefreshScope修饰控制类

4.POST 请求执行刷新

curl -X POST "http://localhost:3370/actuator/refresh"

[https_spring.io_projects_spring-cloud-config_overview]: https://spring.io/projects/spring-cloud-config#overview
[https_github.com_akeung_springclouddemo-config]: https://github.com/akeung/springclouddemo-config
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjAzMjE5OQ_size_16_color_FFFFFF_t_70]: /images/20221124/b84873d90ced4832bcd5d7d0b3eb9091.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjAzMjE5OQ_size_16_color_FFFFFF_t_70 1]: /images/20221124/0e5bd0e63f9e4b89b0d5f8de827d5aea.png
[2020080911462597.png]: /images/20221124/ebc9dfee9cd64393a906da63ff16e286.png
[20200809104220409.png]: /images/20221124/01f744c12a964bdbb9be13ec4c82a4ce.png
[https_docs.spring.io_spring-cloud-config_docs_2.2.4.RELEASE_reference_html]: https://docs.spring.io/spring-cloud-config/docs/2.2.4.RELEASE/reference/html/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjAzMjE5OQ_size_16_color_FFFFFF_t_70 2]: /images/20221124/84acc18b021d499f8d497af732c6e88e.png
[20200809113114125.png]: /images/20221124/e9688f6584944d51b758ce65ceba09d4.png
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