应用通信-方案一:RestTemplate

@RestController
public class ClientController {

	@Autowired
	private LoadBalancerClient loadBalancerClient;

//	@Autowired
//	private RestTemplate template;

	@GetMapping("/msg")
	public String msg() {
//		方式一(写死url,部署的ip未知,负载均衡时，访问服务器未知)
//		RestTemplate restTemplate = new RestTemplate();
//		String response = restTemplate.getForObject("http://localhost:8080/product/getMsg", String.class);

//		方式二:使用loadBalancerClient动态拼接url
		ServiceInstance serviceInstance = loadBalancerClient.choose("product");
		String host = serviceInstance.getHost();
		int port = serviceInstance.getPort();
		String url = String.format("http://%s:%s", host,port) + "/product/getMsg";
		RestTemplate template = new RestTemplate();
		String response = template.getForObject(url, String.class);

		//方式三：采用配置类方式(使用@LoadBalanced)http://product=》http://serviceId
//		String response = template.getForObject("http://product/product/getMsg", String.class);
		System.out.println(response);
		return response;
	}
}

--------------------------------------------------
@Configuration
public class RestTemplateConfig {

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