微服务调用时当调用接口出现一场或者熔断降级，此时我们需求返回默认兜底数据，搞起来！

引入依赖

fallback基于sentinel

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

开启feign支持sentinel配置

feign:
  sentinel:
    enabled: true

创建兜底数据返回类

需要实现被调用的feign接口，并且添加注解@service 交给spring扫描

package net.gorld.feign;

import org.springframework.stereotype.Service;

@Service
public class ProductFeignFallback implements ProductFeign {

  @Override
  public String get() {
    return "兜底数据返回";
  }
}

feign 接口设置fallback

package net.gorld.feign;

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

@Service
@FeignClient(value = "product",fallback = ProductFeignFallback.class)
public interface ProductFeign {
  @GetMapping("test/get")
  String get();
}

验证测试

被调用接口模拟异常

package gorld.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("test")
public class ProductController {

  @GetMapping("get")
  public String get(){
    int a=1/0;
    return "获取商品成功";
  }
}

postman访问

OK！！！

标签：Feign,兜底,get,feign,springframework,org,import,fallback,public
来源： https://blog.csdn.net/csdn570566705/article/details/122134034