I have an object that has about 60 attributes that are both of type String and of type double, plus a few that are of other types, and by chance I need a map where the keys are the names of the attributes of the object and value its values, however I also want to be able to choose which attributes of that object should not be converted to map, that is, I only want those that are of type String and double to be mapped.
I solved it using Jackson with the following:
ObjectMapper mapper = new ObjectMapper();
Map<String, Object> atributosGuiaFedex =
mapper.convertValue(guiaFedex, Map.class);
System.out.println(atributosGuiaFedex);
Where guiaFedex is the object that I want to convert to map and to ignore the attributes I placed the following up to the class I wanted to convert:
@JsonIgnoreProperties({"guia","periodo","id","fechaEnvio","cargosDeGuiaAerea"})
where what is in quotation marks are the attributes to be ignored.
what you can do is convert your class into Iterator to be able to iterate over its attributes, when you iterate you must condition if it is string o double
if (atributo instanceof String) {
esCadena = (String) atributo;
}