docs: public static <T> T map(byte[] content, Class<T> genericType, Charset charset) {
          // 获取映射对象
          ObjectMetaData objectMap = getObjectMap(genericType);
          if (LOGGER.isDebugEnabled()) {
              objectMap.dumpObjectMetaData();
          }
  
          try {
              return mapByIndex(content, genericType, objectMap, charset);
          } catch (InstantiationException ie) {
              LOGGER.debug("Cannot instantiate: ", ie);
              throw new FdfsColumnMapException(ie);
          } catch (IllegalAccessException iae) {
              LOGGER.debug("Illegal access: ", iae);
              throw new FdfsColumnMapException(iae);
          } catch (InvocationTargetException ite) {
              LOGGER.debug("Cannot invoke method: ", ite);
              throw new FdfsColumnMapException(ite);
          }
      }