net.sf.json.JSONException: JSONObject["xxxx"] not found

net.sf.json.JSONException: JSONObject[“xxxx”] not found

1、問題描述
JSONObject jsonObject = user.getuser(username);
String userName = jsonObject.getString(“data”);
然後：
net.sf.json.JSONException: JSONObject[“data”] not found…

2、問題解決

   JSONObject jsonObject = user.getuser(username);
   if（jsonObject.has("data")）{
         String userName = jsonObject.getString("data");   
   } else{
        system.out.println(“你的業務”)
   }