springcloud部分参考

eureka好文：https://www.cnblogs.com/jing99/p/11576133.html

springcloud搭建：https://blog.csdn.net/xiaobug_zs/article/details/130631473

https://www.cnblogs.com/springboot/p/8445780.html

spring RestTemplate详解：https://blog.csdn.net/u012060033/article/details/123352747

eureka.instance.hostname，instance-id，prefer-ip-address的作用及区别：https://blog.csdn.net/m0_37959155/article/details/122521406