【SpringCloud】第六篇: 分布式配置中心(Spring Cloud Config)

本文轉載自查看原文 2018-04-03 14:10 895 SpringCloud/ Spring Cloud

前言:

必需學會SpringBoot基礎知識

簡介:

spring cloud 為開發人員提供了快速構建分布式系統的一些工具，包括配置管理、服務發現、斷路器、路由、微代理、事件總線、全局鎖、決策競選、分布式會話等等。它運行環境簡單，可以在開發人員的電腦上跑。

工具:

JDK8

apache-maven-3.5.2

IntelliJ IDEA 2018.1 x64

一、簡介

在分布式系統中，由於服務數量巨多，為了方便服務配置文件統一管理，實時更新，所以需要分布式配置中心組件。在Spring Cloud中，有分布式配置中心組件spring cloud config ，它支持配置服務放在配置服務的內存中（即本地），也支持放在遠程Git倉庫中。在spring cloud config 組件中，分兩個角色，一是eureka-config-server，二是eureka-config-client。

二、構建 eureka-config-server

(1) 創建springboot項目, 命名: eureka-config-server

(2) pom.xml

<?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.lwc</groupId>
    <artifactId>eureka-config-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka-config-server</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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>Edgware.SR3</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.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</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>


</project>

(3) 啟動類: 添加注解 @EnableConfigServer

package com.lwc;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

/**
 * @author Eddie
 */
@EnableConfigServer
@SpringBootApplication
public class EurekaConfigServerApplication {

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

(4) application.yml 和說明

application.yml

application-dev.yml

spring:
  application:
      name: eureka-config-server
  profiles:
    active: ${@profileActiv@:dev}

server:
  port: 8888
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
spring:
  cloud:
    config:
      server:
        git:
          uri: https://github.com/eddie-code/SpringCloudDemo
          search-paths: config-repo
          username:
          passphrase:
      label: master

spring.cloud.config.server.git.uri：配置git倉庫地址

spring.cloud.config.server.git.searchPaths：配置倉庫路徑

spring.cloud.config.label：配置倉庫的分支

spring.cloud.config.server.git.username：訪問git倉庫的用戶名 (公共庫可無視)

spring.cloud.config.server.git.password：訪問git倉庫的用戶密碼 (公共庫可無視)

里面存在一個config-repo目錄, 里面幾個app*配置文件 (為方便大家,可使用本人提供的)

啟動項目, 訪問: http://localhost:8888/app/local/master

{
     "name": "app",
     "profiles": ["local"],
     "label": "master",
     "version": "e366cdb9f58c68216631b39432dbbaba7ad70809",
     "state": null,
     "propertySources": [{
         "name": "https://github.com/eddie-code/SpringCloudDemo/config-repo/app-local.properties",
         "source": {
             "eddie": "local config"
         }
     },
     {
         "name": "https://github.com/eddie-code/SpringCloudDemo/config-repo/app.properties",
         "source": {
             "eddie": "default config"
         }
     }]
}

證明配置服務中心可以從遠程程序獲取配置信息。

http請求地址和資源文件映射如下:

/{application}/{profile}[/{label}]

/{application}-{profile}.yml

/{label}/{application}-{profile}.yml

/{application}-{profile}.properties

/{label}/{application}-{profile}.properties

三、構建 eureka-config-client

(1) 創建springboot項目, 命名: eureka-config-client

(2) pom.xml

<?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.lwc</groupId>
    <artifactId>eureka-config-client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka-config-client</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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>Edgware.SR3</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-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>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>


</project>

(3) 新建配置文件命名: **bootstrap-*.yml**

(local=本地測試, dev=開發環境, pro=正式環境)

(spring.cloud.config.label=指明遠程倉庫的分支, spring.cloud.config.uri=配置服務中心的網址)

bootstrap.yml

bootstrap-dev.yml (其余自己新建)

spring:
  application:
      name: eureka-config-client
  profiles:
    active: ${@profileActiv@:local}

server:
  port: 8881
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
    register-with-eureka: false
    fetch-registry: false
spring:
  cloud:
    config:
      profile: dev
      label: master
      uri: http://localhost:8888/

(4) 控制層相關代碼

package com.lwc;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author Eddie
 */
@SpringBootApplication
public class EurekaConfigClientApplication {

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

package com.lwc.controller;

import com.lwc.dto.GitDto;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author eddie.lee
 * @Package com.lwc.controller
 * @ClassName AppController
 * @description 獲取配置中心屬性
 * @date created in 2018-04-03 14:22
 * @modified by
 */
@RestController
public class AppController {

    @Autowired
    private GitDto gitDto;

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

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

    @GetMapping("/url")
    public String url() {
        return this.url;
    }

    @GetMapping("/eddie")
    public String eddie() {
        return this.eddie;
    }

    @GetMapping("/configs")
    public String configs() {
        return "This is " + gitDto.getEddie() + " Blog: " + gitDto.getUrl();
    }

}

(5) 測試

訪問: http://localhost:8881/configs

This is local config Blog: http://www.cnblogs.com/EddieBlog/

(6) 圖解

四、源碼下載

標簽 6-1, 6-2

https://github.com/eddie-code/SpringCloudDemo/tree/master/eureka-config-server

https://github.com/eddie-code/SpringCloudDemo/tree/master/eureka-config-client

五、踩過的坑

源碼有記錄

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