SpringBoot的服务注册与发现示例

2019-11-26 12:24:20

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微服务

实践“微服务”自然要学习如何做服务注册与发现

基于SpringBoot来进行微服务的学习，自然选择了与之息息相关的SpringCloud;当然可以选择其他的技术进行，比如dubbo

也可以用zookeeper来实现服务注册与发现，至于zookeeper来实现此功能好还是不好，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等很多子项目。

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

服务注册与发现

SpringCloud模块

spring-cloud-starter-eureka-server

工程module

服务注册中心
服务module

服务注册中心

创建discovery module,并在 build.gradle中引入 spring-cloud-starter-eureka-server依赖

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'}

通过注解 @EnableEurekaServer 提供注册中心服务

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

application.yml 配置eureka属性

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

访问 http://localhost:8761

服务注册

创建服务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'}

通过注解 @EnableDiscoveryClient 进行服务注册

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

application.yml 配置eureka属性

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

注册完成后，可以通过 spring.application.name 的配置来访问该服务

访问 http://localhost:8761 发现服务已经在注册中心上注册

服务注册中心启用用户名密码

通过配置applicaiton.yml用户名密码

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

配置服务提供方application.yml

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