code: public static String toJson(BaseBo bo) {
          if (bo == null) {
              return null;
          }
          String clazz = bo.getClass().getName();
          Map<String, Object> data = new HashMap<>();
          data.put(FIELD_CLASSNAME, clazz);
          data.put(FIELD_BODATA, bo.toJson());
          return SerializationUtils.toJsonString(data);
      }
docs: Serialize a BO to JSON string.
  
  @param bo
  @return