SpringCloud-----分散式配置中心
阿新 • • 發佈：2019-02-18
1、為什麼要把配置做成服務？
假如：在每個工程中都做配置檔案，配置項，那如果要修改的話，那相應的工程都需要重新打包，重啟。
反之：如果放在配置中，配置發生變更的話，只需要重啟相關的服務，更不需要打包
2、什麼是配置中心
在分散式系統中，由於服務數量巨多，為了方便服務配置檔案統一管理，實時更新，所以需要分散式配置中心元件。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spring cloud config 元件中，分兩個角色，一是config server，二是config client。
3、原理圖
4、建立gitee（碼雲）地址，或者github地址倉庫
拷貝倉庫地址：改地址配置在config-server中的配置檔案中，請看下面步驟
5、搭建配置服務讀取中心config-server
pom.xml
<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.cloud</groupId> <artifactId>config-server</artifactId> <version>1.0.0</version> <packaging>jar</packaging> <name>config-server</name> <url>http://maven.apache.org</url> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.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> </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>Camden.SR6</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>
application.properties
spring.application.name=config-server server.port=8889 #gitee遠端配置地址 spring.cloud.config.server.git.uri=https://gitee.com/zemell/config-cloud.git spring.cloud.config.server.git.searchPaths=respo #配置檔案放在master下 spring.cloud.config.label=master #由於建立的配置檔案是公共訪問許可權，所以無需配置使用者名稱密碼 spring.cloud.config.server.git.username= spring.cloud.config.server.git.password=
xxApp.java
package com.cloud.config;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
/**
* Hello world!
*
*/
@SpringBootApplication
@EnableConfigServer
public class ConfigServerApp
{
public static void main( String[] args )
{
SpringApplication.run(ConfigServerApp.class, args);
}
}
6、搭建配置使用端服務(即一般的服務端）config-client
pom.xml
<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.cloud</groupId>
<artifactId>config-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>config-client</name>
<url>http://maven.apache.org</url>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.2.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>
</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>Dalston.RC1</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>
bootstrap.properties
spring.application.name=config-client
server.port=8881
spring.cloud.config.label=master
#讀取的檔案字尾
spring.cloud.config.profile=prod
#配置中心服務端
spring.cloud.config.uri= http://localhost:8889/
xxApp.java
package com.cloud.client;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Hello world!
*
*/
@SpringBootApplication
public class ConfigClientApp
{
public static void main( String[] args )
{
SpringApplication.run(ConfigClientApp.class, args);
}
}
xxController.java
package com.cloud.client;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestController {
@Value("${userName}")
private String userName;
@GetMapping("/getUserName")
public String getUsername(){
return userName;
}
}
結果：
