SpringCloud中Feign接口序列化配置为FastJson

先debug，看下

AbstractHttpMessageConverter

org.springframework.http.converter.AbstractHttpMessageConverter

• 注意到其默认实例是：

class org.springframework.http.converter.json.MappingJackson2HttpMessageConverter

• Jackson相比FastJson，功能个可配置性相对较弱，想换成FastJson，如何处理？

@Configuration
public class ApplicationAutoConfiguration {

    /**
     * http、feign调用，序列化机制改为fastJson
     * @return
     */
    @Bean
    @Primary
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.PrettyFormat,
                SerializerFeature.DisableCircularReferenceDetect,
                SerializerFeature.WriteBigDecimalAsPlain
        );
        fastConverter.setFastJsonConfig(fastJsonConfig);
        List supportedMediaTypes = new ArrayList<>();
        supportedMediaTypes.add(MediaType.APPLICATION_JSON);
        supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(supportedMediaTypes);
        HttpMessageConverter converter = fastConverter;
        return new HttpMessageConverters(converter);
    }
}

• 咱在工程里定义一个配置类，配置一个HttpMessageConverters bean
• 并将该bean标记为@Primary
• 重启后再看看

• 此处需注意的是，不仅仅Feign接口调用改为了FastJson序列化，普通的RestController，也一样改为了FastJson