OpenFeign其SpringQueryMap驼峰转下划线传参

feign调用过程

1. SynchronousMethodHandler 执行 invoke 方法
2. 构建 RequestTemplate 对象
3. 解析 QueryMap 使用 queryMapEncoder.encode(value)
4. QueryMapEncoder 实现类 FieldQueryMapEncoder 类

public Map<String, Object> encode(Object object) throws EncodeException {
    try {
        FieldQueryMapEncoder.ObjectParamMetadata metadata = this.getMetadata(object.getClass());
        Map<String, Object> fieldNameToValue = new HashMap();
        Iterator var4 = metadata.objectFields.iterator();

        while(var4.hasNext()) {
            Field field = (Field)var4.next();
            Object value = field.get(object);
            if (value != null && value != object) {
                Param alias = (Param)field.getAnnotation(Param.class);
                String name = alias != null ? alias.value() : field.getName();
                fieldNameToValue.put(name, value);
            }
        }

        return fieldNameToValue;
    } catch (I