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  • spring-cloud config配置中心

    这里那些概念不说,主要是记录下spring cloud config配置中心的服务端和客户端的一个demo。

    服务端即提供统一配置文件

    客户端即从服务端读取配置

    1.新建一个spring boot项目config-server(config服务端)

    主要依赖:

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

    pom.xml文件如下:

    <?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>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.1.RELEASE</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.example</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>
            <spring-cloud.version>Greenwich.RC1</spring-cloud.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.boot</groupId>
                <artifactId>spring-boot-starter-security</artifactId>
            </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>
    
        <repositories>
            <repository>
                <id>spring-milestones</id>
                <name>Spring Milestones</name>
                <url>https://repo.spring.io/milestone</url>
            </repository>
        </repositories>
    
    </project>
    View Code

    通过注解启用配置中心: @EnableConfigServer

    package com.example.configserver;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.config.server.EnableConfigServer;
    
    @EnableConfigServer
    @SpringBootApplication
    public class ConfigServerApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(ConfigServerApplication.class, args);
        }
    
    }

    修改配置文件: application.yml

    server:
      port: 1201
    
    spring:
      application:
        name: config-server
      cloud:
        config:
          server:
            git:
              # Git 仓库位置
              uri: https://github.com/gexiaoshan518/spring-cloud.git
              # 访问 Git 仓库的用户名
              username:
              # 访问 Git 仓库的密码
              password:
    #          default-label: ${spring.profiles.active}
              # 仓库路径下相对搜索位置,可配置多个
              search-paths: 'config-server/src/main/resources/{application}'
              #force-pull: true
      #加密,配置用户名密码
      security:
        user:
          name: admin
          password: 123456

    配置文件存放在gitHub上

    上面配的git地址(https://github.com/gexiaoshan518/spring-cloud.git),界面如下:

    文件具体位置,在search-paths: 'config-server/src/main/resources/{application}' 路径下:

    config-server结构如下:

    项目推送到gitHub,启动

    可按照以下规则访问配置信息:

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

    各个占位符所代表的含义

    • application: 表示微服务名称,即配置的spring.application.name
    • profile: 表示当前的环境,local、feature、dev、test、prod
    • label: 表示git仓库分支,feature、develop、test、master,当然默认的话是master

    启动后,访问效果如下:

     

    2.新建一个spring boot项目config-client(config客户端)

    结构如下:

    pom.xml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>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.1.RELEASE</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.example</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>
            <spring-cloud.version>Greenwich.RC1</spring-cloud.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-actuator</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>${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>
    
        <repositories>
            <repository>
                <id>spring-milestones</id>
                <name>Spring Milestones</name>
                <url>https://repo.spring.io/milestone</url>
            </repository>
        </repositories>
    
    </project>
    View Code

    配置bootstrap.yml 如下:

    server:
      port: 8088
    
    spring:
      application:
        name: config-client
      profiles:
        active: prod
      cloud:
        config:
          profile: ${spring.profiles.active}
          label: master
          uri: http://localhost:1201
          username: admin
          password: 123456
    ConfigClientApplication代码如下:
    package com.example.configclient;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @SpringBootApplication
    @RestController
    public class ConfigClientApplication {
    
    
        public static void main(String[] args) {
            SpringApplication.run(ConfigClientApplication.class, args);
        }
    
        @Value("${test.test}")
        private String test;
    
        @RequestMapping("/test")
        public String getTest(){
            return test;
        }
    }

    启动,访问http://localhost:8088/test,如下:

    因配置中心中只配置了config-client的test和prod环境的配置文件,若客户端配置spring.profiles.active:dev

    则会读取本项目下的bootstrap-dev.yml 配置文件中的配置

    当仓库中的配置修改后,如何在不启动客户端服务的情况下,更新配置,下面介绍下refresh 手动刷新的方法。

    在客户端添加依赖:

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

    在需要加载变量的类上面加载@RefreshScope,在客户端执行/actuator/refresh的时候就会更新此类下面的变量值。

    @RestController
    @RefreshScope
    public class TestController {
    
        @Value("${test.test}")
        private String test;
    
        @RequestMapping("/test")
        public String getTest(){
            return test;
        }
    }

    修改配置bootstrap.yml,添加如下配置:

    management:
      endpoints:
        web:
          exposure:
            include: refresh

    说明下我这里使用的springboot2.1

    测试:

    调用

    curl -X POST http://localhost:8088/actuator/refresh

    后,在调用接口,配置更新demo代码gitHub地址:https://github.com/gexiaoshan518/spring-cloud

    欢迎扫码交流:

     
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  • 原文地址:https://www.cnblogs.com/gexiaoshan/p/10190565.html
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