服务发现RestTemplate和Feign

①    直接使用RestTemplate，固定URL

 @GetMapping("/say")
    public String say(){
        RestTemplate restTemplate = new RestTemplate();
        String str = restTemplate.getForObject("http://localhost:8081/hello",String.class);
        return "say "+str;
    }

②    注入LoadBalancerClient通过应用名获取URL

    @Autowired
    private LoadBalancerClient loadBalancerClient;

    @GetMapping("/say")
    public String say(){
        ServiceInstance serviceInstance = loadBalancerClient.choose("CLIENT");
        RestTemplate restTemplate = new RestTemplate();
        String url = String.format("http://%s:%s/hello",serviceInstance.getHost(),serviceInstance.getPort());
        String str = restTemplate.getForObject(url,String.class);
    }

③配置RestTemplate，URL直接使用应用名

    @Component
    public class RestTemplateConfig {
        @Bean
        @LoadBalanced
        public RestTemplate restTemplate(){
            return  new RestTemplate();
        }

    }

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    @Autowired

    private RestTemplate restTemplate;

①    配置注解@EnableFeignClients

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class DemoApplication {


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

}

②配置接口

  @Autowired

    HelloClient client;