CODEWITHSUNDEEP
javaarraysjson
ARR.s
ARR.s

Reputation: 769

How to create json format java

I would like to create JSON format and I have some problem about this

I have no idea to create Jsonarray and JsonObject in JsonObject

{
   "users": [7, 16, 35],
   "group_id": "sdkfjsdkljflds"
}

I try

JSONObject jsonParams = new JSONObject();

try {
    jsonParams.put("group_id", "dlfsdds");
    jsonParams.put("users", list);

} catch (JSONException e) {
  e.printStackTrace();
}

and my log is show 

{
   "users":"[7, 16, 35]",
   "group_id":"dlfsdds"
}

ps. list is from

for (int k=0;k<allMember.size();k++){
    list.add(allMember.get(k));
}

what is my mistake? and How to fix it?

thank for your help:D

Upvotes: 1

Views: 449

Answers (1)

BackSlash
BackSlash

Reputation: 22233

You need to convert the list to JSONArray first:

try {
    jsonParams.put("group_id", "dlfsdds");

    JSONArray listJson = new JSONArray();

    for(int i=0; i<list.size(); i++) {
        listJson.put(list.get(i));
    }


    jsonParams.put("users", listJson);

} catch (JSONException e) {
  e.printStackTrace();
}

Most libraries also allow you to avoid the for-loop and simply do:

JSONArray listJson = new JSONArray(list);

Upvotes: 2

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