上文我们对@FeignClient做了详细的介绍，接下来，我们来一起feign的两种降级方式。
fallbackFactory 推荐：可以捕获异常信息并返回默认降级结果。可以打印堆栈信息。
Fallback
容错类
import com.ossa.feign.api.producer.ProducerFeign;
import feign.hystrix.FallbackFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
/**
* @author issavior
*/
@Slf4j
@Service
public class ProducerFeignFallback implements ProducerFeign {
@Override
public String producerById(String id) {
String msg = "fallback限流方法";
return id + msg;
}
}
FeignClient
import com.ossa.feign.config.FeignClientConfig;
import com.ossa.feign.fallback.ProducerFeignFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
/**
* @author issavior
*/
@FeignClient(value = "ossa-service-producer", configuration = FeignClientConfig.class,fallback = ProducerFeignFallback.class)
public interface ProducerFeign {
/**
* 根据ID查询商品
*
* @param id 商品的主键ID
* @return 相关商品的信息
*/
@GetMapping(value = "/producer/{id}")
String producerById(@PathVariable("id") String id);
}
FallbackFactory
容错类
import com.ossa.feign.api.producer.ProducerFeign;
import feign.hystrix.FallbackFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
/**
* @author issavior
*/
@Slf4j
@Service
public class ProducerFeignFallback implements FallbackFactory<ProducerFeign> {
@Override
public ProducerFeign create(Throwable throwable) {
return id -> {
log.info("错误是：{}", throwable.getMessage());
String msg = "fallback限流方法";
return id + msg;
};
}
}
FeignClient
import com.ossa.feign.config.FeignClientConfig;
import com.ossa.feign.fallback.ProducerFeignFallback;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
/**
* @author issavior
*/
@FeignClient(value = "ossa-service-producer", configuration = FeignClientConfig.class,fallbackFactory = ProducerFeignFallback.class)
public interface ProducerFeign {
/**
* 根据ID查询商品
*
* @param id 商品的主键ID
* @return 相关商品的信息
*/
@GetMapping(value = "/producer/{id}")
String producerById(@PathVariable("id") String id);
}
原文始发于微信公众号（步尔斯特）：【微服务｜openfeign】feign的两种降级方式｜Fallback｜FallbackFactory
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