SpringCloud教程 | 第六篇: 分布式配置中心(Spring Cloud Config)(Finchley版本)

时间:2022-04-18 23:03:01

在上一篇文章讲述zuul的时候,已经提到过,使用配置服务来保存各个服务的配置文件。它就是Spring Cloud Config。

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

父maven工程省略,父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.forezp</groupId>
<artifactId>sc-f-chapter6</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging> <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 http://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>
<packaging>jar</packaging> <name>config-server</name>
<description>Demo project for Spring Boot</description> <parent>
<groupId>com.forezp</groupId>
<artifactId>sc-f-chapter6</artifactId>
<version>0.0.1-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>
</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:


@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/forezp/SpringcloudConfig/
spring.cloud.config.server.git.searchPaths=respo
spring.cloud.config.label=master
spring.cloud.config.server.git.username=
spring.cloud.config.server.git.password=
  • 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,本例子是公开仓库,放心使用。

远程仓库https://github.com/forezp/SpringcloudConfig/ 中有个文件config-client-dev.properties文件中有一个属性:

foo = foo version 3

启动程序:访问http://localhost:8888/foo/dev

{"name":"foo","profiles":["dev"],"label":"master",
"version":"792ffc77c03f4b138d28e89b576900ac5e01a44b","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 http://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>
<packaging>jar</packaging> <name>config-client</name>
<description>Demo project for Spring Boot</description> <parent>
<groupId>com.forezp</groupId>
<artifactId>sc-f-chapter6</artifactId>
<version>0.0.1-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:

@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:

SpringCloud教程 | 第六篇: 分布式配置中心(Spring Cloud Config)(Finchley版本)

本文源码下载:
https://github.com/forezp/SpringCloudLearning/tree/master/sc-f-chapter6

四、参考资料

http://blog.csdn.net/forezp/article/details/70037291

http://cloud.spring.io/spring-cloud-static/Finchley.RELEASE/single/spring-cloud.html

原文地址:http://blog.csdn.net/forezp。
https://blog.csdn.net/forezp/article/details/81041028