In Java geschriebenes Microservice-Service-Registrierungscenter und Service-Discovery-Tool

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

spring.application.name=eureka-server
server.port=8761

eureka.client.registerWithEureka=false
eureka.client.fetchRegistry=false
eureka.server.enable-self-preservation=false
eureka.server.eviction-interval-timer-in-ms=60000

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

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

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka</artifactId>
    </dependency>
    
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
    </dependency>
</dependencies>

spring.application.name=service-discovery-client
server.port=8080

eureka.client.service-url.defaultZone=http://localhost:8761/eureka/

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @Autowired
    private DiscoveryClient discoveryClient;

    @GetMapping("/hello")
    public String hello() {
        List<ServiceInstance> instances = discoveryClient.getInstances("hello-service");
        if (instances != null && !instances.isEmpty()) {
            ServiceInstance serviceInstance = instances.get(0);
            String url = serviceInstance.getUri().toString();
            RestTemplate restTemplate = new RestTemplate();
            return restTemplate.getForObject(url + "/hello", String.class);
        }
        return "No service available.";
    }
}