json (which contains few objects) to TreeMap on java

Question

can somebody show code which deserialize json to TreeMap? Some simple example which includes example of json I'll show what I've tried First of all I am newbie so forgive me That's my json(probably i have mistakes even here):

{"Car":[{"mark":"AUDI_A3", "colour": "black"},
{"mark":"BMW_m3", "colour": "white"}]}

There is my code which does not work

public static void main(String[] args) {
        open();
    }
    private static void open(){
        try {
            BufferedReader buff = new BufferedReader(new FileReader("C:\Users\\t1.json"));
            String bf=null;
            String json= null;
            while((bf=buff.readLine())!=null){
                json+=bf;
            }
            Gson gson = new Gson();
            Type type = new TypeToken<TreeMap<String, SmallGuys>>(){}.getType();
            TreeMap<String, SmallGuys> Platoon = gson.fromJson(json, type);
            System.out.print(Platoon.keySet());
        }
        catch (Exception e){
            System.out.println("There is a mistake");
        }
    }

have you tried this: http://stackoverflow.com/a/29965924/1754020 — Eddie Martinez, Feb 23 '17 at 22:05
Have you looked at [Convert Json to Map](http://stackoverflow.com/questions/443499/convert-json-to-map)? — azurefrog, Feb 23 '17 at 22:11
just tried, have not helped final Type Map = new TypeToken>() { }.getType(); Gson gson = new Gson(); JsonReader reader = new JsonReader(buff); TreeMap data = gson.fromJson(reader, Map); // contains the whole reviews list System.out.print(data.keySet()); — Geba, Feb 23 '17 at 22:20
Possible duplicate of [Convert Json to Map](http://stackoverflow.com/questions/443499/convert-json-to-map) — Tony Dong, Feb 23 '17 at 22:31

Jason Glez · Answer 1 · 2017-02-23T22:22:35.857

1

With Jackson, I put some methods:

public static Object convertJsonRequestToObject(HttpServletRequest pRequest, Class<?> pObject) throws JsonParseException, JsonMappingException, IOException {
    return new ObjectMapper().readValue(IOUtils.toString(pRequest.getInputStream(), StandardCharsets.UTF_8), pObject);
}

public static Map<String,Object> parseJsonToMap(String json) throws JsonParseException, JsonMappingException, IOException{
    return   new ObjectMapper().readValue(json, HashMap.class);
}

public static Map<String,Object> parseObjectToMap(Object object){
    return  (Map<String, Object>) new ObjectMapper().convertValue(object, Map.class);
}

//inverse
public static Object parseMapToObject(Map<?, ?> pMap, Class<?> pClass){
    return new ObjectMapper().convertValue(pMap, pClass);
}

edited Feb 23 '17 at 22:22

answered Feb 23 '17 at 22:17

Jason Glez

1,254
1
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{"batchSize":10,"batchIndex":1,"inventoryInformation":{"inventoryName":"Test","userName":"jason.gonzalez","beginDate":"2017-02-16","endDate":"2017-02-23","category":"2"}} and the entity for this JSON public class InventoryInput { private int batchIndex; private int batchSize; private HashMap inventoryInformation; public InventoryInput(){ } //Set and Get } – Jason Glez Feb 23 '17 at 22:33
Also I can add object on the entity to convert, example: var user = { fullName: getCurrentSpotUser() } var location = { idLocation: spotInformation.locationId, user } var inventory = { idInventory: inventoryGeneralInformation.inventoryData.inventoryId } dataSend.inventoryInformation = { location, inventory }; – Jason Glez Feb 23 '17 at 22:36

json (which contains few objects) to TreeMap on java

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