Feign客戶端錯誤處理

Question

我正在使用Feign客戶端，

我有一個位置服務。所以我使用FeignClient爲我的LocationService創建了一個客戶端。

@FeignClient(url="http://localhost:9003/location/v1", name="location-service") 
public interface LocationControllerVOneClient { 

    @RequestMapping(value = "/getMultipleLocalities", method = RequestMethod.POST) 
    public Response<Map<Integer, Locality>> getMultipleLocalities(List<Integer> localityIds); 

    @RequestMapping(value = "/getMultipleCities", method = RequestMethod.POST) 
    public Response<Map<Integer, City>> getMultipleCities(List<Integer> cityIds); 

    @RequestMapping(value = "/getMultipleStates", method = RequestMethod.POST) 
    public Response<Map<Integer, State>> getMultipleStates(List<Integer> stateIds); 

    @RequestMapping(value = "/getMultipleCitiesName", method = RequestMethod.POST) 
    public Response<Map<Integer, String>> getMultipleCitiesName(MultiValueMap<String, String> formParams); 

    @RequestMapping(value = "/getMultipleStatesName", method = RequestMethod.POST) 
    public Response<Map<Integer, String>> getMultipleStatesName(MultiValueMap<String, String> formParams); 

    @RequestMapping(value = "/getMultipleLocalitiesName", method = RequestMethod.POST) 
    public Response<Map<Integer, String>> getMultipleLocalitiesName(MultiValueMap<String, String> formParams); 

} 

現在其他服務可能會通過LocationClient調用此LocationService。我想對這個Feign客戶端（LocationClient）的異常處理在一個共同的地方（即我不想讓每個調用者這樣做，這應該是LocationClient的一部分）。異常可能會被拒絕連接（如果LocationService關閉），超時等

Answer 1

您可以定義一個備用客戶端時調用像超時或拒絕連接異常出現：

@FeignClient(url="http://localhost:9003/location/v1", name="location-service", fallback=LocationFallbackClient.class) 
public interface LocationControllerVOneClient { 
    ... 
} 

LocationFallbackClient必須實現LocationControllerVOneClient 。