spring - 如何使用 Spring Cloud Netflix Feign 设置自定义 Jackson ObjectMapper

Question

我遇到了一种情况，我需要为第三方 API 定义一次性 @FeignClient。在此客户端中，我想使用与我的 @Primary 不同的自定义 Jackson ObjectMapper。我知道可以覆盖 spring 的 feign 配置默认值，但是我不清楚如何仅通过此特定客户端来简单地覆盖 ObjectMapper。

Answer 1

根据 documentation ，您可以为您的 Feign 客户端提供自定义解码器，如下所示。

假客户端接口(interface):

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

Feign 客户端自定义配置:

@Configuration
public class FooClientConfig {

    @Bean
    public Decoder feignDecoder() {
        HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter(customObjectMapper());

        HttpMessageConverters httpMessageConverters = new HttpMessageConverters(jacksonConverter);
        ObjectFactory<HttpMessageConverters> objectFactory = () -> httpMessageConverters;


        return new ResponseEntityDecoder(new SpringDecoder(objectFactory));
    }

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