java - How to set the value of loadBalancerKey in ribbon or Feign -

in spring cloud, i'm using ribbon or feign client api, , have server cluster registered in eureka. in case, want use specific key determine server want call, eg: server-a has 2 instances, localhost:8001 , localhost:8002, , want call 8001 setting loadbalancerkey 8001, after can write customized balance rule class choose server can call below:

public class myconfigbalancerule extends clientconfigenabledroundrobinrule {     @override     public server choose(object key) {         list<server> serverlist = getloadbalancer().getallservers();         (server srv : serverlist) {             if (srv.getport == key) {                 return srv;             }         }     } }