spring项目调用nacos,怎么把Instance转为微服务ISysClient的FeignClient

[gclsoft]

拿到了Instance成功了,怎么用, 不然拿到了也没用

    @RequestMapping(value = "/get", method = GET)
    @ResponseBody
    public String get(@RequestParam String serviceName) throws NacosException {
        List<Instance> ret= namingService.getAllInstances(serviceName);
        Instance nacosServer=(Instance) ret.get(0);
        ISysClient sysClient= (ISysClient)  nacosServer; //这里报错误了
        R<String> retData=sysClient.getDeptIds(11L,"dd");
        System.out.printf("ret="+retData);
        return "";
    }

报错:
java.lang.ClassCastException: com.alibaba.nacos.api.naming.pojo.Instance cannot be cast to com.alibaba.nacos.example.spring.controller.ISysClient
    at com.alibaba.nacos.example.spring.controller.DiscoveryController.get(DiscoveryController.java:31)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:743)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:672)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:82)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:933)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:867)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:951)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:842)