SpringCloud的学习-SpringCloudConfig分布式配置中心（6）

本文链接：https://blog.youkuaiyun.com/qq_36676682/article/details/88713881

本文介绍了Spring Cloud Config组件，它可统一管理分布式系统的配置文件并实时更新。文中详细说明了该组件中Config Server和Config Client的创建过程，包括添加依赖、注解，配置application.yml等，还给出了访问示例及http请求地址与资源文件的映射关系。

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在分布式系统中，服务数量会很多，如果要修改服务的配置文件，会很麻烦，这个时候，我们想把配置文件放在一个地方统一管理，实时更新，Spring Cloud 就给我们提供了这样一个组件——Spring Cloud Config。

简介

在Spring Cloud中，有分布式配置中心组件spring cloud config ，它支持配置服务放在配置服务的内存中（即本地），也支持放在远程Git仓库中。在spring cloud config 组件中，分两个角色，一是config server，二是config client。

创建ConfigServer

New-projec-spring initializr , next-next-cloud config-server(client端就选client)

添加依赖
Pom文件配置如下:

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>configserver</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>configserver</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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

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

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Camden.SR6</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>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>


</project>

添加注解
在工程启动类上添加@EnableConfigServer开启配置服务器功能

@EnableConfigServer

配置application.yml

spring:
  application:
    name: config-server
  cloud:
    config:
      server:
          git:
            uri: https://github.com/shmilyah/cloud-config-samples.git
            search-paths: '{application}'
      label: master
server:
  port: 8888

spring.cloud.config.server.git.uri：配置git仓库地址

spring.cloud.config.server.git.searchPaths：配置仓库路径，这里的配置会根据传入的应用名动态查找

由于我这里配置的 git 仓库为公开的，所以不需要配置用户名和密码，如果你配置的是私有仓库，还需要配置用户名和密码

spring.cloud.config.server.git.username 和spring.cloud.config.server.git.password

启动程序访问 http://localhost:8888/config-client/dev/master
将会显示

{“name”:“config-client”,“profiles”:[“dev”],“label”:“master”,“version”:“62a1d6b3d883e8378ed961a3a1566adfc48239b6”,“state”:null,“propertySources”:[{“name”:“https://github.com/shmilyah/cloud-config-samples.git/config-client/config-client-dev.yaml",“source”:{“hello”:"world”}}]}

http请求地址和资源文件映射如下:

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

创建ConfigClient

按照之前的方法，选择client即可
配置Pom文件：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>configclient</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>configclient</name>
    <description>Demo project for Spring Boot</description>
    <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <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.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>Dalston.RC1</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>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>


</project>

配置application.yml

server:
  port: 8989

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

spring.cloud.config.profile: dev开发环境配置文件 test测试环境 pro正式环境

写一个api接口，返回读取的配置中心的值

@SpringBootApplication
@RestController
public class ConfigclientApplication {

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

    @Value("${hello}")
    private String hello;
    @RequestMapping("/hh")
    public  String hh(){
        return  hello;
    }
}

启动程序访问 http://localhost:8989/hh
将会显示：