I'm trying to deserialize a Hashmap and it's breaking the program when i try to use it after. I would like to check if the JSON is null or empty before i deserialize it. How can i check this?
"HashMap<String, Administrador> administradores = new HashMap<>();
///here i want to check if there is something in the JSON (jackson)
administradores =
Persistencia.DEserializeHashMap(Archivos.ADMINISTRADORESALL
.getPath(), String.class, Administrador.class);///deserialize
Try-catch your code
try {
administradores = Persistencia.DEserializeHashMap(Archivos.ADMINISTRADORESALL.getPath(), String.class, Administrador.class);
}
catch(Exception e) {
//It is null or empty
}
if(administradores != null && !administradores.isEmpty()) {
//Code
}
Personally, I prefer using com.google.gson.Gson
String json = null;
Map<String, Object> map = new Gson().fromJson(json, Map.class);
if(map != null && !map .isEmpty()) {
//Code
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.