springcloud教程第5篇:config-server配置中心

springcloud教程第5篇:config-server配置中心

1、简介

在分布式系统中,由于服务数量巨多,为了方便服务配置文件统一管理,实时更新,所以需要分布式配置中心组件。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

2、构建config server

创建一个spring-boot项目,取名为config-server

pom.xml:需引入eureka-client、spring cloud config server

        <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-netflix-eureka-client</artifactId>
        </dependency>

在程序的入口Application类加上@EnableConfigServer注解开启配置服务器的功能,代码如下:

@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {

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

application.properties:

#server.port= 8763
#spring.application.name= config-server
#
##配置中心
#spring.cloud.config.server.git.uri= https://github.com/JunTech/springcloud-config-repo
#spring.cloud.config.server.git.password=
#spring.cloud.config.server.git.username=
#spring.cloud.config.server.git.search-paths=config-repo
#spring.cloud.config.label=master
server:
  port: 8763
spring:
  application:
    name: config-server
  profiles:
    active: native
  cloud:
    config:
      server:
        native:
          search-locations: classpath:/configRepo
  • 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
  • spring.cloud.config.label:配置仓库的分支
  • spring.cloud.config.server.git.username:访问git仓库的用户名
  • spring.cloud.config.server.git.password:访问git仓库的用户密码

如果Git仓库为公开仓库,可以不填写用户名和密码,如果是私有仓库需要填写.

没注释的是配置在本地环境的!!!

1、配置在git仓库

远程仓库https://github.com/yourname/your repository/中创建文件config-client-dev.yml,文件中有一个属性:

author: juntech

启动程序:访问http://localhost:8888/author/dev

证明配置服务中心可以从远程程序获取配置信息。

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

2、配置在本地

在applicaiton.*目录下创建configRepo文件夹,用于存放各个client的配置文件!

config-client-dev.yml:

author: juntech
server:
  port: 10007

3、构建一个config client

重新创建一个springboot项目,取名为config-client,其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 https://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>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>top.juntech</groupId>
    <artifactId>springcloud-config-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud-config-client</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR2</spring-cloud.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-netflix-eureka-client</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </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>
            <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>

bootstrap.yml: (注意,每个client的配置文件都必须是bootstrap.yml(properties),不然会报错,各位可以试试)

#spring.application.name= config-client
#server.port= 10007
#
#spring.cloud.config.profile= dev
##指明配置服务中心的网址
#spring.cloud.config.uri = http://localhost:8763
#spring.cloud.config.label=master


spring:
  application:
    name: config-client
  profiles:
    active: dev
  cloud:
    config:
      uri: http://localhost:8763
eureka:
  client:
    service-url:
      default-zone: http://localhost:8761/eureka/
  • spring.cloud.config.label 指明远程仓库的分支
  • spring.cloud.config.profile
    • dev开发环境配置文件
    • test测试环境
    • pro正式环境
  • spring.cloud.config.uri= http://localhost:8763/ 指明配置服务中心的网址。
  • 读取的是配置中心的 config-client-dev.yml或properties

程序的入口类,写一个API接口“/hi”,返回从配置中心读取的author变量的值,代码如下:

package top.juntech.springcloudconfigclient;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
@EnableDiscoveryClient
public class SpringcloudConfigClientApplication {

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

    @Value("${author}")
    private String author;

    @Value("${server.port}")
    private String port;

    @GetMapping("/hi")
    public String hi(){
        return "hi ,author : "+this.author+",i am from port : "+this.port;
    }
}

打开网址访问:http://localhost:10007/hi,网页显示:

hi ,author : juntech,i am from port : 10007

这就说明,config-client从config-server获取了foo的属性,而config-server是从git仓库读取的,如图:

Azure (2).png

4、参考资料


Author: Juntech
Reprint policy: All articles in this blog are used except for special statements CC BY 4.0 reprint polocy. If reproduced, please indicate source Juntech !
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