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;

}