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spring cloud 分散式配置中心

簡介

在spring cloud中,有分散式配置中心元件spring cloud config,它支援配置服務放在配置服務的記憶體中(即本地),也支援放在遠端git倉庫中,在該元件中,分兩個角色,一是config server, 二是config client。

實踐

1、構建config server

(1)在原有工程上,建立一個spring-boot專案,取名為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>

(2)在程式的入口Application類加上@EnableConfigServer註解開啟配置伺服器的功能。

@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {

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

(3)application.yml配置

spring:
  application:
    name: config-server
  cloud:
    config:
      server:
        git:
          uri: https://github.com/forezp/SpringcloudConfig/  #配置git倉庫地址
          search-paths: respo  #配置倉庫路徑 
          username:  #如果git倉庫為公開倉庫,可以填寫使用者名稱客密碼,如果是私有倉庫需要填寫
          password:
      label: master  #配置倉庫分支


server:
  port: 8888

(4)啟動程式

2、構建一個config client

(1)重新建立一個spring boot專案,取名為config-client,其pom檔案

<?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>

(2)application.yml檔案

spring:
  application:
    name: config-client
  cloud:
    config:
      label: master #遠端倉庫的分支
      profile: dev  
      uri: http://localhost:8888/  #配置服務中心的網址
server:
  port: 8881

(3)程式的入口類,寫一個API介面,返回從配置中心讀取的foo變數的值

@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;
	}
}

(4)啟動程式,訪問http://localhost:8881/hi