java 获取对象中为null的字段实例代码

private static String[] getNullPropertyNames(Object source) {
    final BeanWrapper src = new BeanWrapperImpl(source);
    java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

    Set<String> emptyNames = new HashSet<>();
    for(java.beans.PropertyDescriptor pd : pds) {
      Object srcValue = src.getPropertyValue(pd.getName());
      if (srcValue == null) emptyNames.add(pd.getName());
    }
    String[] result = new String[emptyNames.size()];
    return emptyNames.toArray(result);
  }

public static List<String> getValue(Object object,List<String> list){
  Field[] field = object.getClass().getDeclaredFields();
  for(int j=0 ; j<field.length ; j++){
    String name = field[j].getName();
    name = name.substring(0,1).toUpperCase()+name.substring(1);
    String type = field[j].getGenericType().toString();
      Method m;
      Object value;
      try {
        m = object.getClass().getMethod("get"+name);
        value = m.invoke(object);
        if(value == null || "".equals(value)){
          list.add(name);
        }
      } catch (IllegalAccessException e) {
        e.printStackTrace();
      } catch (IllegalArgumentException e) {
        e.printStackTrace();
      } catch (InvocationTargetException e) {
        e.printStackTrace();
      } catch (NoSuchMethodException e) {
        e.printStackTrace();
      } catch (SecurityException e) {
        e.printStackTrace();
      }
  }
  return list;
}