簡介
Spring Cloud Config就是我們通常意義上的配置中心,把應用原本放在本地文件的配置抽取出來放在中心服務器,從而能夠提供更好的管理、發佈能力。
Spring Cloud Config分服務端和客戶端,服務端負責將git(svn)中存儲的配置文件發佈成REST接口,客戶端可以從服務端REST接口獲取配置。但客戶端並不能主動感知到配置的變化,從而主動去獲取新的配置,這需要每個客戶端通過POST方法觸發各自的/refresh
。
Spring Cloud Bus通過一個輕量級消息代理連接分佈式系統的節點。這可以用於廣播狀態更改(如配置更改)或其他管理指令。SpringCloudBus提供了通過POST方法訪問的endpoint/bus/refresh
,這個接口通常由git的鉤子功能調用,用以通知各個SpringCloudConfig的客戶端去服務端更新配置。在spring cloud config 組件中,分兩個角色,一是config server,二是config client。
構建Config Server
創建一個spring-boot項目,取名爲config-server,其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>cn.easted</groupId>
<artifactId>com</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>com</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.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>Dalston.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>
<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>
在程序的入口Application類加上@EnableConfigServer註解開啓配置服務器的功能,代碼如下:
@SpringBootApplication
@EnableConfigServerpublic class ConfigServerApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApplication.class, args);
}}
需要在程序的配置文件application.yml文件配置以下:
spring.application.name=config-serverserver.port=8888 spring.cloud.config.server.git.uri=https://github.com/forezp/SpringcloudConfig/spring.cloud.config.server.git.searchPaths=respospring.cloud.config.label=masterspring.cloud.config.server.git.username=spring.cloud.config.server.git.password=
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
spring.cloud.config.server.git.password:訪問git倉庫的用戶密碼
遠程倉庫https://github.com/shaweiwei/myspringcloudconfig/ 中有個文件config-client-dev.properties文件中有一個屬性:
fooo=version
啓動程序:訪問http://localhost:8888/fooo/dev
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
構建一個config client
重新創建一個springboot項目,取名爲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-clientspring.cloud.config.label=masterspring.cloud.config.profile=devspring.cloud.config.uri= http://localhost:8888/server.port=8881
spring.cloud.config.label 指明遠程倉庫的分支
spring.cloud.config.profile
dev開發環境配置文件
test測試環境
pro正式環境
spring.cloud.config.uri= http://localhost:8888/ 指明配置服務中心的網址。
程序的入口類,寫一個API接口“/hi”,返回從配置中心讀取的foo變量的值,代碼如下:
//需要JAVA Spring Cloud大型企業分佈式微服務雲構建的B2B2C電子商務平臺源碼一零三八七七四六二六
@SpringBootApplication
@RestControllerpublic 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;
}
}
打開網址訪問:http://localhost:8881/hi,網頁顯示: version
這就說明,config-client從config-server獲取了foo的屬性,而config-server是從git倉庫讀取的。 java B2B2C springmvc mybatis電子商務平臺源碼