code: public static Class<?> getRealGenericClass(Class<?> clazz, Type type) {
          if(type instanceof TypeVariable) {
              TypeVariable<?> tv = (TypeVariable<?>) type;
              Type genericFieldType = getInheritGenericType(clazz, tv);
              if (genericFieldType != null) {
                  return Lang.getTypeClass(genericFieldType);
              }
          }
          return Lang.getTypeClass(type);
      }
docs: 获取泛型类中type变量对应的真实class
  @param clazz 泛型基类.
  @param type 泛型基类中的某个type
  @return