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import com.test.JsonUtils;
import feign.Response;
import feign.Util;
import feign.codec.ErrorDecoder;
import io.test.BadRequestException;
import io.test.InternalServerErrorException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import static feign.FeignException.errorStatus;

/**
 * @author 飄逝才子
 * @date 2020/11/05
 * @description
 */
@Configuration
public class FeignClientErrorDecoder implements ErrorDecoder {
    private Logger logger = LoggerFactory.getLogger(FeignClientErrorDecoder.class);

    @Override
    public Exception decode(String methodKey, Response response) {
        Map<String, Object> jsonBody = new HashMap<>();
        jsonBody.put("message", "Internal server error");
        try {
            String body = Util.toString(response.body().asReader());
            jsonBody = JsonUtils.toMap(body);
        } catch (IOException e) {
            logger.error("feign.IOException", e);
        }
        assert jsonBody != null;
        if (response.status() >= 400 && response.status() < 500) {
            throw new BadRequestException(jsonBody.get("message").toString());
        }

        if (response.status() >= 500) {
            throw new InternalServerErrorException(jsonBody.get("message").toString());
        }

        return errorStatus(methodKey, response);
    }
}

注意，使用這個方式，需要在熔斷器關閉時才起作用，因為它們的執(zhí)行過程是，先走這個攔截器，再走熔斷的fallback，所以這個異常會被熔斷吞掉，返回狀態(tài)為200，返回值為你的fallback的默認值。

FeignClient異常合集Mark

問題1

feignClient調用報異常cause:Content-Type cannot contain wildcard type ‘*’

是因為遠程調用的時候入參識別不了application/json

解決辦法：在方法上加上類型即可consumes = MediaType.APPLICATION_JSON_VALUE

@RequestMapping(value = "/xxx/xxx/xxx/xxx/xxx/xxx/result",method = RequestMethod.GET, consumes = MediaType.APPLICATION_JSON_VALUE)
ResponseResult xxx(TaskParam taskParam);