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Spring Cloud(六)分布式配置中心(Spring Cl

Spring Cloud(六)分布式配置中心(Spring Cl

作者: _Hatake_Kakashi | 来源:发表于2018-12-06 11:13 被阅读0次

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

建立父maven工程,pom代码如下

<?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>demo2-springcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>demo2-springcloud</name>
    <description>Demo project for Spring Boot</description>

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

    <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>

创建子module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>

    <parent>
        <groupId>com.example</groupId>
        <artifactId>demo2-springcloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>com.example</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>

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

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

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);
    }
}

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

spring:
  application:
    name: config-server
  cloud:
    config:
      server:
        git:
          uri: https://github.com/forezp/SpringcloudConfig/
          search-paths: respo
          username:
          password:
      label: master
server:
  port: 8888
  • 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。(大佬的Git仓库,搬过来的)

启动程序:访问http://localhost:8888/config-client/dev
访问结果

{"name":"config-client","profiles":["dev"],"label":null,"version":"00d32612a38898781bce791a4a845e60a7fbdb4e","state":null,"propertySources":[{"name":"https://github.com/forezp/SpringcloudConfig//respo/config-client-dev.properties","source":{"foo":"foo version 2","democonfigclient.message":"hello spring io"}}]}

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

示例

三,构建一个Config Client

再创建一个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.example</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.example</groupId>
        <artifactId>demo2-springcloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <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>
    </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:(注意此时是新建一个新的properties配置文件!!!不然会报错!!)

bootstrap

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.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;

@RestController
@SpringBootApplication
public class ConfigClientApplication {

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

    @Value("${foo}")
    String foo;
    @RequestMapping("/hi")
    public String sayHi(){
        return foo;
    }

}

打开网址访问:http://localhost:8881/hi

访问结果

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:


参考资料

大佬的文章https://blog.csdn.net/forezp/article/details/81041028#commentsedit

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