讲述了一个服务如何从配置中心读取文件，配置中心如何从远程git读取配置文件，当服务实例很多时，都从配置中心读取文件，这时可以考虑将配置中心做成一个微服务，将其集群化，从而达到高可用，架构图如下：
一、准备工作
继续使用上一篇文章的工程，创建一个eureka-server工程，用作服务注册中心。
在其pom.xml文件引入Eureka的起步依赖spring-cloud-starter-eureka-server，代码如下:
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | <?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>eureka-server</artifactId> <version> 0.0 . 1 -SNAPSHOT</version> <packaging>jar</packaging> <name>eureka-server</name> <description>Demo project for Spring Boot</description> <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-eureka-server</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> |
在配置文件application.yml上，指定服务端口为8889，加上作为服务注册中心的基本配置，代码如下：复制代码
| 1 2 3 4 5 6 7 8 9 10 11 | server: port: 8889 eureka: instance: hostname: localhost client: registerWithEureka: false fetchRegistry: false serviceUrl: defaultZone: http: //${eureka.instance.hostname}:${server.port}/eureka/ |
入口类：
| 1 2 3 4 5 6 7 8 | @EnableEurekaServer @SpringBootApplication public class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run(EurekaServerApplication. class , args); } } |
二、改造config-server
在其pom.xml文件加上EurekaClient的起步依赖spring-cloud-starter-eureka，代码如下:
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | <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> |
配置文件application.yml，指定服务注册地址为，其他配置同上一篇文章，完整的配置如下：
| 1 2 3 4 5 6 7 8 9 | spring.application.name=config-server server.port= 8888 spring.cloud.config.server.git.uri=https: //github.com/forezp/SpringcloudConfig/ spring.cloud.config.server.git.searchPaths=respo spring.cloud.config.label=master spring.cloud.config.server.git.username= your username spring.cloud.config.server.git.password= your password eureka.client.serviceUrl.defaultZone=http: //localhost:8889/eureka/ |
最后需要在程序的启动类Application加上@EnableEureka的注解。
三、改造config-client
将其注册微到服务注册中心，作为Eureka客户端，需要pom文件加上起步依赖spring-cloud-starter-eureka，代码如下：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | <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.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> |
配置文件bootstrap.properties，注意是bootstrap。加上服务注册地址为http://localhost:8889/eureka/复制代码
| 1 2 3 4 5 6 7 8 9 | spring.application.name=config-client spring.cloud.config.label=master spring.cloud.config.profile=dev #spring.cloud.config.uri= http: //localhost:8888/ eureka.client.serviceUrl.defaultZone=http: //localhost:8889/eureka/ spring.cloud.config.discovery.enabled= true spring.cloud.config.discovery.serviceId=config-server server.port= 8881 |
架构代码如下:
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