微服务核心技术

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一、微服务核心技术

1、服务注册和发现

1.1 技术选型

1.2 Eureka实现

1.2.1 搭建Erueka Server

1、创建工程
2、导入坐标

<dependency>
	<groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>

3、配置application.yml

spring:
  application:
    name: eureka-server
server:
  port: 9000 #端口
#配置eureka server
eureka:
  client:
    register-with-eureka: false #是否将自己注册到注册中心
    fetch-registry: false #是否从eureka中获取注册信息
    service-url: #配置暴露给Eureka Client的请求地址
      defaultZone: http://127.0.0.1:9000/eureka/
  server:
    enable-self-preservation: false #关闭自我保护
    eviction-interval-timer-in-ms: 4000 #剔除服务间隔

4、配置启动类

@SpringBootApplication
//激活eureakaserver
@EnableEurekaServer
public class EurekaServerApplication {
    
    

	public static void main(String[] args) {
    
    
		SpringApplication.run(EurekaServerApplication.class,args);
	}
}

5、启动

1.2.2 将服务提供者注册到EurekaServer

1、引入EurekaClient坐标

<!--引入EurekaClient-->
 <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
 </dependency>

2、application.yml

#配置Eureka
eureka:
  client:
    service-url:
      defaultZone: http://localhost:9000/eureka/ #多个eurekaserver之间用,隔开
  instance:
    prefer-ip-address: true #使用ip地址注册

3、启动类配置

@SpringBootApplication
@EntityScan("com.uncle.product.entity")
//激活eurekaClient
//@EnableEurekaClient
//@EnableDiscoveryClient
public class ProductApplication {
    
    

	public static void main(String[] args) {
    
    
		SpringApplication.run(ProductApplication.class,args);
	}
}

1.2.3 服务消费者通过Eureka获取服务列表，并调用

1、引入EurekaClient坐标

<!--引入EurekaClient-->
 <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
 </dependency>

2、application.yml

#配置Eureka
eureka:
  client:
    service-url:
      defaultZone: http://localhost:9000/eureka/ #多个eurekaserver之间用,隔开
  instance:
    prefer-ip-address: true #使用ip地址注册

3、启动类配置

@SpringBootApplication
@EntityScan("com.uncle.order.entity")
//激活eurekaClient
//@EnableEurekaClient
//@EnableDiscoveryClient
public class OrderApplication {
    
    

	public static void main(String[] args) {
    
    
		SpringApplication.run(OrderApplication.class,args);
	}
}

4、DiscoveryClient的使用

@Autowired
private DiscoveryClient discoveryClient;
...
discoveryClient.getInstances("service-product");
### 1.3 EruekaServer高可用
-- 多个EruekaServer，各个微服务都注册到各个EruekaServer
### 1.4 EruekaServer高可用