[Java] 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;
}