Using Spring Boot to implement service registration and discovery under microservice architecture

With the rapid development of the Internet, microservice architecture is gradually becoming one of the mainstream architectures. The advantage of this architecture is to split a large and complex application into multiple small and independent services, which can be easily maintained. , rapid deployment and flexible expansion. In the microservice architecture, service registration and discovery are a very important part. This article will introduce how to use Spring Boot to implement service registration and discovery under the microservice architecture.

1. Service Registration

Service registration refers to registering a microservice to the service registration center so that other services can discover and call it. In Spring Boot, you can use Eureka as the service registration center. The following are the steps to implement service registration through Spring Boot and Eureka:

1. Introduce Eureka dependencies

First you need to introduce Eureka dependencies in the pom.xml file:

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

2. Write the configuration file

Then you need to configure the relevant properties in the application.yml or application.properties file:

server:
  port: 8761

spring:
  application:
    name: eureka-server

eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

The meaning of the properties here is as follows:

• server.port: The port number of the Eureka service registration center
• spring.application.name: The name of the Eureka service registration center, here set to eureka-server
• eureka .instance.hostname: The host name of the service registration center, set here to localhost, or it can be set to the IP address
• eureka.client.registerWithEureka: Whether to register this service to the Eureka service registration center, here set to false , indicating not to register
• eureka.client.fetchRegistry: Whether to obtain the service of the Eureka service registration center, set to false here, indicating not to obtain the service
• eureka.client.serviceUrl.defaultZone: Eureka service registration The address of the center, set here to http://${eureka.instance.hostname}:${server.port}/eureka/

3. Add the @EnableEurekaServer annotation

Finally, add the @EnableEurekaServer annotation to the Spring Boot startup class to enable the Eureka service registration center:

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

This completes the construction of the service registration center, which can be accessed through http://localhost:8761 The console of the Eureka service registration center.

2. Service Discovery

Service discovery means that in the microservice architecture, services can automatically discover and call other microservices through the address and name of the service registration center. To implement service discovery, you can use the Eureka client in Spring Boot.

1. Introducing Eureka client dependencies

It is also necessary to introduce Eureka client dependencies in the pom.xml file:

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

2. Write the configuration file

Then you need to configure the relevant properties in the application.yml or application.properties file:

server:
  port: 8080

spring:
  application:
    name: demo-service

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

The meaning of the properties here is as follows:

• server.port : Service port number
• spring.application.name: The name of the service registration, which will be used to find the service in the Eureka service registration center
• eureka.client.serviceUrl.defaultZone: Eureka service The address of the registration center, here is set to http://localhost:8761/eureka/

3. Add the @EnableDiscoveryClient annotation

Finally, start the Spring Boot class Add the @EnableDiscoveryClient annotation to enable the Eureka client:

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

This completes the use of Spring Boot and Eureka to implement service registration and discovery under the microservice architecture.

Summary

This article introduces how to use Spring Boot and Eureka to implement service registration and discovery under a microservice architecture. Service registration and discovery are very important in the microservice architecture. Eureka can easily and conveniently realize service registration and discovery, so that different microservices can quickly call and interact with each other.

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