SpringBoot -- 服務註冊與發現

微服務

實踐“微服務”自然要學習如何做服務註冊與發現
基於SpringBoot來進行微服務的學習，自然選擇了與之息息相關的SpringCloud;當然可以選擇其他的技術進行，比如dubbo
也可以用zookeeper來實現服務註冊與發現，至於zookeeper來實現此功能好還是不好，各家之言都有

SpringCloud

Spring Cloud provides tools for developers to quickly build some of the common patterns in distributed systems .SpringCloud
SpringCloud 包含了 Distributed/versioned configuration、Distributed/versioned configuration等很多子項目。

• Distributed/versioned configuration
• Service registration and discovery
• Routing
• Service-to-service calls
• Load balancing
• Circuit Breakers
• Global locks
• Leadership election and cluster state
• Distributed messaging

服務註冊與發現

SpringCloud模塊

• spring-cloud-starter-eureka-server

工程module

• 服務註冊中心
• 服務module

服務註冊中心

創建discovery module,並在 build.gradle中引入 spring-cloud-starter-eureka-server依賴

apply plugin: 'org.springframework.boot'

dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:"+ springCloudVersion
    }
}
repositories {
    mavenCentral()
}
dependencies {
    compile ('org.springframework.cloud:spring-cloud-starter-eureka-server')
}
jar {
    baseName = 'discovery-bootcwenao'
}

通過註解 @EnableEurekaServer 提供註冊中心服務

/**
 * @author cwenao
 * @version $Id DiscoveryBootcwenaoApplication.java, v 0.1 2017-01-12 9:56 cwenao Exp $$
 */
@EnableEurekaServer
@SpringBootApplication
public class DiscoveryBootcwenaoApplication {
    public static void main(String[] args) {
        new SpringApplicationBuilder(DiscoveryBootcwenaoApplication.class).web(true).run(args);
    }
}

application.yml 配置eureka屬性

server:
  port: 8761
eureka:
  instance:
    hostname: discovery
  client:
    registerWithEureka: false
    fetchRegistry: false
    service-url:
      defaultZone: http://discovery:${server.port}/eureka/

訪問 http://localhost:8761

服務註冊

創建服務module, 在build.gradle中引入 spring-cloud-starter-eureka

apply plugin: 'org.springframework.boot'
dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:"+ springCloudVersion
    }
}

dependencies {
    compile('org.springframework.cloud:spring-cloud-starter-eureka')
    compile('org.springframework.cloud:spring-cloud-stream')
}
sourceSets {
    main {
        resources.srcDirs = ['src/main/resources', 'src/main/java']
        resources.includes = ['**/*.xml', '**/*.yml']
    }
}
jar {
    baseName = 'apigateway-bootcwenao'
}

通過註解 @EnableDiscoveryClient 進行服務註冊

@SpringBootApplication
@EnableDiscoveryClient
public class ApiGatewayBootcwenaoApplication {
    public static void main(String[] args) {
        SpringApplication.run(ApiGatewayBootcwenaoApplication.class, args);
    }
}

application.yml 配置eureka屬性

server:
  port: 10002
spring:
  application:
    name: apigateway
eureka:
 client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

註冊完成後，可以通過 spring.application.name 的配置來訪問該服務

訪問 http://localhost:8761 發現服務已經在註冊中心上註冊

服務註冊中心啓用用戶名密碼

通過配置applicaiton.yml用戶名密碼

security:
  basic:
    enabled: true
  user:
   name: aa
   password: abcd

配置服務提供方application.yml

eureka:
  instance:
    hostname: configserver
    prefer-ip-address: true
  client:
    registerWithEureka: true
    fetchRegistry: true
    service-url:
      defaultZone: http://aa:abcd@localhost:8761/eureka/

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代碼

代碼請移步 Github參考地址

如有疑問請加公衆號（K171），如果覺得對您有幫助請 github start