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;}