sentinel和openfeign整合

        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-nacos-discovery
        
        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
        
        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-sentinel
        

服务消费者配置文件中开启Feign对Sentinel的支持

feign:
  sentinel:
    enabled: true

package per.pz.openfeign;

import org.springframework.stereotype.Component;

@Component
public class StockFeignServiceFallback implements StockFeignService{
    @Override
    public String reduct(){
        return "Fallback,降级了";
    }
}

为OpenFeign远程调用接口添加fallback属性值指定容错类

package per.pz.openfeign;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;


@Service
@FeignClient(name = "stock-service",path = "/stock",fallback = StockFeignServiceFallback.class)
public interface StockFeignService {
    //声明需要调用的rest接口对应的方法
    @RequestMapping("/reduct")
    String reduct();
}