Spring Cloud（十四）Config实战

深碍√TFBOYSˉ_ 2022-12-18 13:53 135阅读 0赞

## 1、创建父工程 config ##

项目名称：config

<?xml version="1.0" encoding="UTF-8"?>
    <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yi</groupId>
        <artifactId>config</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>config-server</name>
        <description>config-server分布式配置中心</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.3.RELEASE</version>
            <relativePath/>
        </parent>
    
        <modules>
            <module>config-client</module>
            <module>config-server</module>
        </modules>
        
    	<properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
            <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </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>
    
    </project>

## 2、构建一个config server ##

项目名称：config-server

<?xml version="1.0" encoding="UTF-8"?>
    <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yi</groupId>
        <artifactId>config-server</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
        <name>config-server</name>
        <description>config-server分布式配置中心</description>
    
        <parent>
            <groupId>com.yi</groupId>
            <artifactId>config</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</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>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

server:
      port: 8888
    
    spring:
      application:
        name: config-server
      cloud:
        config:
          server:
            git:
              uri: https://github.com/yilei111/SpringcloudConfig/ #配置git仓库地址
              searchPaths: respo #配置仓库路径
              username: #访问git仓库的用户名
              password: #访问git仓库的用户密码
          label: master #配置仓库的分支
    
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/

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

创建git仓库，并上传配置文件内容

config-client-dev.properties
    version = 1
    
    
    config-client-pro.properties
    version = 2

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]

Spring Cloud Config 有它的一套访问规则，我们通过这套规则在浏览器上直接访问

*  /\{application\}/\{profile\}\[/\{label\}\]
 *  /\{application\}-\{profile\}.yml
 *  /\{application\}-\{profile\}.properties
 *  /\{label\}/\{application\}-\{profile\}.yml
 *  /\{label\}/\{application\}-\{profile\}.properties

> \{application\} 就是应用名称，对应到配置文件上来，就是配置文件的名称部分。

> \{profile\} 就是配置文件的版本，我们的项目有开发版本、测试环境版本、生产环境版本，对应到配置文件上来就是以 application-\{profile\}.yml 加以区分，例如application-dev.yml、application-sit.yml、application-prod.yml。

> \{label\} 表示 git 分支，默认是 master 分支，如果项目是以分支做区分也是可以的，那就可以通过不同的 label 来控制访问不同的配置文件了。

http://localhost:8888/config/dev/master
    
    http://localhost:8888/config/pro
    
    http://localhost:8888/config-dev.properties
    
    http://localhost:8888/config-pro.properties
    
    http://localhost:8888/master/config-pro.properties

## 3、构建一个config client（通过uri直连访问config-server服务） ##

项目名称：config-client

bootstrap.yml

spring:
      application:
        name: config-client
      cloud:
        config:
          label: master
          profile: dev
          uri: http://localhost:8888/
    
    server:
      port: 8881

> bootstrap.yml 用于应用程序上下文的引导阶段。  
> bootstrap.yml 由父Spring ApplicationContext加载。  
> bootstrap.yml 可以理解成系统级别的一些参数配置，这些参数一般是不会变动的。  
> application.yml 可以用来定义应用级别的，如果搭配 spring-cloud-config 使用 application.yml 里面定义的文件可以实现动态替换。

使用Spring Cloud Config Server时，应在 bootstrap.yml 中指定：

spring.application.name
    spring.cloud.config.server.git.uri
    一些加密/解密信息

@SpringBootApplication
    @RestController
    public class ConfigClientApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ConfigClientApplication.class, args);
        }
    
        @Value("${version}")
        String version;
    
        @RequestMapping(value = "/helloWorld")
        public String helloWorld() {
            return "版本号："+version;
        }
    }

访问`http://localhost:8881/helloWorld`

![在这里插入图片描述][20201028215257352.png_pic_center]

## 4、构建一个config client（高可用分布式服务配置中心） ##

第3小节config client客户端直接通过ip地址来连接config server服务，如果部署了多个config server实例搭建高可用集群的话，通过url无法实现，这时需要结合eureka来发现config server服务。

直接改造工程**config-server**

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

直接改造工程**config-client**

<?xml version="1.0" encoding="UTF-8"?>
    <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.yi</groupId>
        <artifactId>config-client</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>config-client</name>
        <description>config-client</description>
    
        <parent>
            <groupId>com.yi</groupId>
            <artifactId>config</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
    
        <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-netflix-eureka-client</artifactId>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

bootstrap.yml

spring:
      application:
        name: config-client
      cloud:
        config:
          label: master #指明远程仓库的分支
          profile: dev  #dev开发版本
          discovery:
            enabled: true
            serviceId: CONFIG-SERVER #配置服务中心
    
    server:
      port: 8881
    
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/

读取配置文件不再写ip地址，而是服务名，这时如果配置服务部署多份，通过负载均衡，从而高可用

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

git项目源码：[https://github.com/yilei111/-Spring-Cloud-Finchley][https_github.com_yilei111_-Spring-Cloud-Finchley]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI5OTE0ODM3_size_16_color_FFFFFF_t_70_pic_center]: /images/20221122/dc562d8e2e664305bdcdadb28047b200.png
[20201028215257352.png_pic_center]: /images/20221122/4df542646cf04e1d9dfb570a29bd8d5a.png
[https_github.com_yilei111_-Spring-Cloud-Finchley]: https://github.com/yilei111/-Spring-Cloud-Finchley