Question

I would like to know if it is possible to convert any Java object to JSON object. Currently I have the following code.

JSONArray data = new JSONArray();
for (User user : users) {
            JSONArray row = new JSONArray();
            row.put(user.getId()).put(user.getUserName()).put(user.isEnabled());
            data.put(row);
        }

The current issue is different object (e.g. User and Admin) will have different property, thus the above code will work for other object. I am thinking of putting a similar code in my GenericHibernateDAO in order to automatically convert any list into a json list.

Answer 1

You can serialize your java object to json object. There are n number of library is available ex gson, jettyson, flexjson etc.

GSON example –

Gson gson = new Gson();
Collection<Integer> ints = Lists.immutableList(1,2,3,4,5);

(Serialization)
String json = gson.toJson(ints); ==> json is [1,2,3,4,5]