Eureka服务调用

配置文件

server:
  port: 8811
spring:
  application:
    name: eurekaServiceClient
eureka:
  instance:
    hostname: localhost
    prefer-ip-address: true
  client:
    serviceUrl:
      defaultZone: http://${eureka.instance.hostname}:8761/eureka/```

## 启动类
加上 `@EnableEurekaClient` `@EnableDiscoveryClient` 注解
`@EnableDiscoveryClient`开启服务发现功能
如果是使用Feign，需要加上`@EnableFeignClients`注解，开启Feign的使用
```java

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

    @RequestMapping("/")
    @ResponseBody
    public String main() {
        return "hello";
    }
}

RestTemplate

    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
        return new RestTemplate();
    }

RestTemplate使用@LoadBalanced注解

调用

// EUREKACLIENT 为调用的微服务名称
String remoteIpServiceUrl = "http://EUREKACLIENT/";
String result = restTemplate.getForObject(remoteIpServiceUrl, String.class);

Feign

使用@FeignClient

声明

@FeignClient("EUREKACLIENT")
public interface FeignClientService {
    @RequestMapping(method = RequestMethod.GET, value = "/")
    String hello();
}

使用

        String result = feignClientService.hello();
        return result;

依赖

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

        <!-- 使用ribbon时才用的上 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <!-- 使用feign时才用的上 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>