pom.xml

<!--nacos-服务注册发现-->
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!--添加openfeign依赖-->
<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<!--snetinel依赖-->
<dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
</dependency>

yml配置

#对feign的支持
feign:sentinel:enabled: true  #添加feign对sentinel的支持

ProductFeignService （作用是当远程调用服务product-service发生异常的时候会执行ProductFeignFallBackService 的 get方法）

@FeignClient(value = "product-service", path = "/product", fallback = ProductFeignFallBackService.class)
public interface ProductFeignService {@RequestMapping("/{id}")public String get(@PathVariable Integer id);}

ProductFeignFallBackService

/*** @Description:* @Author: xu* @Data: 2024-2024/4/22-22* @Version: V1.0*/
public class ProductFeignFallBackService implements ProductFeignService {@Overridepublic String get(Integer id) {return "进入降级";}
}