SpringCloud-微服务-Config

微服务 SpringBoot SpringCloud
SpringCloud
发布日期:   2021-10-23
文章字数:   2.3k
阅读时长:   12 分
阅读次数:  

SpringCloud Config

本地读取配置文件

  1. 新建maven工程，前面几次文章有提到。pom.xml:
    <?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>org.zwq</groupId>
    <artifactId>cloud-config</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>


    <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>
        <spring-cloud.version>Dalston.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>


</project>
     
  2. 在主工程里面创建config-server module工程。
    配置pom.xml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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.zwq</groupId>
        <artifactId>cloud-config</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>com.zwq</groupId>
    <artifactId>config-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>config-server</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <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>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
     
    在启动类上加上@EnableConfigServer注解，开启ConfigServer功能。
     
    配置application.yml文件：
    spring:
  cloud:
    config:
      server:
        native:
          search-locations: classpath:/shared   #配置 Config Server 本地读取配置,路径
  profiles:
    active: native
  application:
    name: config-server

server:
  port: 8769
     
    然后在工程的 Resources 目录下建 shared 文件夹，用于存放本地配置文件。
    在该文件夹下新建config-client-dev.yml文件，用作 dev （开发环境〉的配置文件:
    #client dev （开发环境〉的配置文件
server:
  port: 8762

foo: foo version 1
     
  3. 在主工程里面创建config-client module工程。
    配置pom.xml：
    <?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>
    <parent>
        <groupId>org.zwq</groupId>
        <artifactId>cloud-config</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.zwq</groupId>
    <artifactId>config-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>config-client</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
     
    修改配置文件，bootstrap.yml：
    #向 Uri 地址为 http://localhost:8769的 Config Server 读取配置文件
spring:
  application:
    name: config-client
  cloud:
    config:
      uri: http://localhost:8769
      fail-fast: true
  profiles:
    active: dev
     
  4. 启动config-server,然后启动config-client服务，可以看见client读取了server的配置文件。并且开的端口是8762
     
  5. 进一步验证：在config-client新建包controller,新建TestController，写一个接口读取配置文件的foo变量:
    import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * description: 测试
 *
 * @author zwq
 * @date 2021/10/23 22:42
 */
@RestController
public class TestController {

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

    @RequestMapping(value = "/foo")
    public String foo() {
        return foo;
    }

}
  6. 访问 http://localhost:8762/foo :

从远程Git读取配置文件

Spring Cloud Config 可以从远程 Git 仓库读取配置文件，这样就能将配置统一管理。并且也能通过Spring Cloud Bus 在不人工启动程序的情况下对 Config Client 的配置进行刷新。

配置

首先修改Config Server配置文件application.yml:

server:
  port: 8769

# remote git
spring:
  cloud:
    config:
      server:
        git:
          uri: https://github.com/zwqmore/SpringcloudConfig.git
          searchPaths: respo
          force-pull: true
          timeout: 20	
          strict-host-key-checking: false  
          #username:
          #password:
          default-label: main
      label: main
  application:
    name: config-server

如果是私人Git仓库，需要登录用户名和密码。
然后将eureka client-dev.yml上传到github仓库。同时修改一下配置文件的变量：

foo: foo version 2

访问测试

启动config-server,config-client服务，访问http://localhost:8762/foo ：

config-server从远程Git仓库读取配置文件成功。

构建高可用的Config Server

当服务实例很多时，所有的服务实例需要同时从配置中心Config Server 读取配置文件，这时可以考虑将配置中心 Config Server 做成一个微服务，并且将其集群化，从而达到高可用。
Config Server架构图：

配置

新建module工程eureka-server,配置pom.xml：

<?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>
    <parent>
        <groupId>org.zwq</groupId>
        <artifactId>cloud-config</artifactId>
        <version>1.0-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.zwq</groupId>
    <artifactId>eureka-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>eureka-server</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

 
配置application.yml:

server:
  port: 8761
eureka:
  client:
    register-with-eureka: false
    fetch-registry: false
    serviceUrl:
      defaultZone: http://localhost:${server.port}/eureka/

在启动类加上@EnableEurekaServer注解，开启EnableServer功能
 
修改Config-Server工程：
pom.xml加上依赖:

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

作为eureka-client，同时在启动类加上@EnableEurekaClient注解。
配置application.yml:

server:
  port: 8769

# remote git
spring:
  cloud:
    config:
      server:
        git:
          uri: https://github.com/zwqmore/SpringcloudConfig.git
          searchPaths: respo
          force-pull: true
          timeout: 20
          strict-host-key-checking: false
          #username:
          #password:
          default-label: main
      label: main
  application:
    name: config-server

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

 
修改Config-Client
pom.xml加上依赖：

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

作为eureka-client，同时在启动类加上@EnableEurekaClient注解。
配置application.yml:

spring:
  application:
    name: config-client
  cloud:
    config:
      #uri: http://localhost:8769
      fail-fast: true
      discovery:
        enabled: true
        service-id: config-server
  profiles:
    active: dev

server:
  port: 8762

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

访问测试

启动eureka-server,两个config-server实例（不同端口启动）
然后多次启动config-client服务，控制台可以发现config-client从不同端口读取配置文件，并且做了负载均衡。

微服务 SpringBoot SpringCloud
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