一、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。

二、构建Config Server

pom

<?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.forezp</groupId>
<artifactId>sc-f-chapter6</artifactId>
<version>1.0-SNAPSHOT</version>


<modules>
<module>config-server</module>
<module>config-client</module>
</modules>

<name>sc-f-chapter6</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.3.RELEASE</version>
<relativePath/>
</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>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>

创建一个spring-boot项目,取名为config-server,其pom.xml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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <groupId>com.forezp</groupId> 
    <artifactId>config-server</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
    <name>config-server</name> 
    <description>Demo project for Spring Boot</description> 
 
 
    <parent> 
        <groupId>com.forezp</groupId> 
        <artifactId>sc-f-chapter6</artifactId> 
        <version>1.0-SNAPSHOT</version> 
    </parent> 
 
    <dependencies> 
        <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> 
        <dependency> 
            <groupId>com.forezp</groupId> 
            <artifactId>sc-f-chapter6</artifactId> 
            <version>1.0-SNAPSHOT</version> 
        </dependency> 
        <dependency> 
            <groupId>com.forezp</groupId> 
            <artifactId>sc-f-chapter6</artifactId> 
            <version>1.0-SNAPSHOT</version> 
        </dependency> 
    </dependencies> 
    <build> 
        <plugins> 
            <plugin> 
                <groupId>org.springframework.boot</groupId> 
                <artifactId>spring-boot-maven-plugin</artifactId> 
            </plugin> 
        </plugins> 
    </build> 
 
 
</project>

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:

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

需要在程序的配置文件application.properties文件配置以下:

spring.application.name=config-server 
server.port=8888 
 
spring.cloud.config.server.git.uri=https://github.com/CMRcircle/SpringcloudConfig/(这里换成你自己的仓库地址) 
spring.cloud.config.server.git.searchPaths=respos(你仓库文件夹) 
spring.cloud.config.label=master(你的分支) 
spring.cloud.config.server.git.username=你的用户名 
spring.cloud.config.server.git.password=你的密码
  • 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

foo = foo version 3

启动程序:访问http://localhost:8888/foo/dev

{"name":"foo","profiles":["dev"],"label":null,"version":"cfe66eaea0ad0e7efc39a12669884597d045c796","state":null,"propertySources":[]}

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

三、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> 
 
    <groupId>com.forezp</groupId> 
    <artifactId>config-client</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
    <name>config-client</name> 
    <description>Demo project for Spring Boot</description> 
    <parent> 
        <groupId>com.forezp</groupId> 
        <artifactId>sc-f-chapter6</artifactId> 
        <version>1.0-SNAPSHOT</version> 
    </parent> 
 
    <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>

其配置文件bootstrap.properties:

spring.application.name=config-client 
spring.cloud.config.label=master 
spring.cloud.config.profile=dev 
spring.cloud.config.uri= http://localhost:8888/ 
server.port=8881
  • 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:8888/ 指明配置服务中心的网址。

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

package com.forezp.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("${foo}") 
    String foo; 
    @RequestMapping(value = "/hi") 
    public String hi(){ 
        return foo; 
    } 
 
}

打开网址访问:http://localhost:8881/hi,网页显示:

foo version 3

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:

源码:IT虾米网


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