#配置SpringCloud,只配置配置Eureka，未配置其它，报
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.ResourceAccessException: I/O error on GET request for “http://CLOUD-PAYMENT-SERVICE/payment/get/31”: CLOUD-PAYMENT-SERVICE; nested exception is java.net.UnknownHostException: CLOUD-PAYMENT-SERVICE] with root cause
解决方法：
加上@LoadBalanced
