「微服務」之服務註冊與發現的實例詳解

本篇文章主要介紹了SpringBoot的服務註冊與發現範例,具有一定的參考價值，有興趣的小夥伴們可以參考一下

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，例如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、

SpringCloud 包含了Distributed/versioned configuration、

1. SpringCloud 包含了Distributed/versioned configuration、

SpringCloud 包含了Distributed/versioned versioned configuration等很多子專案。
Distributed/versioned configuration
Service registration and discovery
Routing
#Service-to-service calls
Load balancing
Circuit Breakers

9. 
   

#Global locks
Leadership election and cluster state

Distributed messaging

##服務註冊與發現

SpringCloud模組

spring-cloud-starter-eureka-server

工程

module

服務註冊中心

服務module

##服務註冊中心

建立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'
}

透過註解@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 設定eureka屬性

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

存取localhost:8761

######## #####建立服務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'
}

###透過註解@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 設定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，可以透過spring.application.name 的設定來存取該服務######存取localhost:8761 發現服務已經在註冊中心上註冊########## ############服務註冊中心啟用使用者名稱密碼#########透過設定applicaiton.yml使用者名稱密碼###

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

###設定服務提供者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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