Eureka

Eureka Server

创建项目命名为eureka-server
maven依赖:

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

配置Euraka:

spring.application.name=eureka-server
server.port=1001
eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

使用@EnableEurekaServer注解启用Eureka Server：

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

启动程序：

Eureka Client

创建SpringBoot应用命名为eureka-client
maven依赖：

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

application.properties配置文件：

spring.application.name=eureka-client
server.port=2001
eureka.client.serviceUrl.defaultZone=http://localhost:1001/eureka/

注册微服务的基本配置。

Application类：

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

@EnableDiscoveryClient能激活注册中心（Eureka、Consul）中的DiscoveryClient实现，可以让注册中心发现，扫描到该服务。这样才能够访问注册中心的信息。

实现测试接口：

@RestController
public class DcController {

    @Autowired
    DiscoveryClient discoveryClient;

    @GetMapping("/ls")
    public String listServices() {
        String services = "Services: " + discoveryClient.getServices();
        System.out.println(services);
        return services;
    }

    @GetMapping("/instance/{serviceId}")
    public ResponseEntity<Map<String, String>> getInstanceInfo(@PathVariable String serviceId) {
        Map<String, String> resultMap = new HashMap<>();
        List<ServiceInstance> servicesInstance = discoveryClient.getInstances(serviceId);
        if(servicesInstance.size()==0) {
            return new ResponseEntity<>(resultMap, HttpStatus.OK);
        }
        ServiceInstance serviceInstance = servicesInstance.get(0);
        resultMap.put("host", serviceInstance.getHost());
        resultMap.put("port", String.valueOf(serviceInstance.getPort()));
        return new ResponseEntity<>(resultMap, HttpStatus.OK);
    }
}

启动eureka-client访问eureka-server（http://localhost:1001）可以看到服务已经注册

测试接口：