Parsing JSON to POJO using GSON

Question

My JSON looks like follow :

\"message_defaults\": {
      \"LabResultsRequestDefaultMessage\": {
        \"MsgTypeId\": 8,
        \"StaffId\":          


        

Answer 1

You can do the following without changing your json structure.

Type mapType = new TypeToken<Map<String, MessageDefault>>() {}.getType();
Map<String, MessageDefault> messagesMap = gson.fromJson(json, mapType);
List<MessageDefault> messages = new ArrayList<MessageDefault>(messagesMap.values());

Answer 2

If you want to get List from json first you have to correct your json. List must be in '[ ]'.

"message_defaults": [{
      "LabResultsRequestDefaultMessage": {
        "MsgTypeId": 8,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Lab Department"
      },
      "ReferralRequestDefaultMessage": {
        "MsgTypeId": 6,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Physican"
      },
      "MessageComposeDefaultMessage": {
        "MsgTypeId": 1,
        "StaffId": 122,
        "StaffName": "Willis,Sam",
        "FirstName": "Sam",
        "MI": "D",
        "LastName": "Willis",
        "DefaultMessage": "Office Manager/Willis Sam"
      }
}]

EDIT : try this for converting to list

Type collectionType = new TypeToken<Collection<Integer>>(){}.getType();
Collection<Integer> ints2 = gson.fromJson(json, collectionType);

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