其实openfeign整合sentinel真的很简单，openfeign环境搭建参考三、springCloudAlibaba-feign的简单使用 然后整合过程很简单。

注：不一定要整合到sentinel控制台

1、服务消费者加入依赖

<dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

2、feign开启对sentinel的支持

feign:
  sentinel:
    enabled: true;

3、新建一个异常类，实现feign的对应服务接口

package com.suibibk.springCloud.order.openfeign;
import org.springframework.stereotype.Component;
@Component
public class StockFeignServiceFallback implements  StockService{
    @Override
    public String reduce() {
        return "降级了";
    }
}

4、加上fallback

package com.suibibk.springCloud.order.openfeign;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
@FeignClient(name="stock-service",path="/stock" ,fallback=StockFeignServiceFallback.class)
public interface StockService {
    @RequestMapping("/reduce")
    public String reduce();
}

ok！