解析JSON时接收Null

Question

Here is the response that I am receiving from my REST service from a GET Request:

{
  "type": "usersTable",
  "employeeId": 1,
  "employeeName": "Andrew Watson",
  "userPin": "705207"
}

I am trying to retrieve the userPin value from the JSON.

Here is the code I have attempted:

if (con.getResponseCode() == HttpsURLConnection.HTTP_OK 
           || con.getResponseCode() == HttpsURLConnection.HTTP_ACCEPTED ) {
    String line;
    BufferedReader br=new BufferedReader(new InputStreamReader(con.getInputStream()));
    while ((line=br.readLine()) != null) {
        JSONObject json = new JSONObject(br.toString());
        userPinRetrieved = String.valueOf(json.getInt("userPin"));
    }
}

Can anyone see why I am getting a Null Pointer?

Answer 1

I have not tested this one yet. But I think the problem is userPin is string not an integer value.

 if (con.getResponseCode() == HttpsURLConnection.HTTP_OK 
               || con.getResponseCode() == HttpsURLConnection.HTTP_ACCEPTED ) {
        String line;
        BufferedReader br=new BufferedReader(new InputStreamReader(con.getInputStream()));
        while ((line=br.readLine()) != null) {
            JSONObject json = new JSONObject(br.toString()); 
            if(json.getString("userPin") == null) {
               //do something here or define the default value
            }else {
                userPinRetrieved = json.getString("userPin");
            }
        }
    }