如何使用Spring雲Netflix Feign設置自定義Jackson ObjectMapper

Question

我遇到了一個需要爲第三方API定義一次性@FeignClient的場景。在這個客戶端中，我想使用與我的@Primary不同的自定義Jackson ObjectMapper。我知道可以重寫Spring的假裝配置默認值，但是我不清楚如何僅僅通過這個特定的客戶端來覆蓋ObjectMapper。

Answer 1

根據documentation，您可以爲您的Feign客戶端提供自定義解碼器，如下所示。

假死客戶端接口：

@FeignClient(value = "foo", configuration = FooClientConfig.class) 
public interface FooClient{ 
    //Your mappings 
} 

假死客戶定製配置：

@Configuration 
public class FooClientConfig { 

    @Bean 
    public Decoder feignDecoder() { 
     HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter(customObjectMapper()); 
     ObjectFactory<HttpMessageConverters> objectFactory =() -> new HttpMessageConverters(jacksonConverter); 
     return new ResponseEntityDecoder(new SpringDecoder(objectFactory)); 
    } 

    public ObjectMapper customObjectMapper(){ 
     ObjectMapper objectMapper = new ObjectMapper(); 
     //Customize as much as you want 
     return objectMapper; 
    } 
}