java Object转Map＜K,Y＞

private static Map<String, Object> objToMap(Object obj) {
  Map<String, Object> map = new HashMap<>();
  Field[] fields = obj.getClass().getDeclaredFields();
  for (Field field : fields) {
   String varName = field.getName();
   varName = varName.toLowerCase();//将key置为小写，默认为对象的属性
   try {
    boolean accessFlag = field.isAccessible();
    field.setAccessible(true);
    Object o = field.get(obj);
    if (o != null)
     map.put(varName, o);
    field.setAccessible(accessFlag);
   } catch (IllegalArgumentException | IllegalAccessException ex) {
    ex.fillInStackTrace();
   }
  }
  return map;
}