如何知道JSON字符串是否可以无错误地转换为JSONObject？

Question

如何处理此问题，以便它不会出现以下错误

JSONObject dataObject = new JSONObject(data);
String currentDynamicKey = "7";
JSONObject currentDynamicValue = dataObject.getJSONObject(currentDynamicKey);

错误：

org.json.JSONException: Value  at 7 of type java.lang.String cannot be converted to JSONObject

json数据：

{"2":{"id":2,"title":"Battleship game","enabled":"1","connection_alert":"1","prot":"2","port":"6410","analysis":"1","send_data":"Analysis Data box","regex":"\/HTTP\/1.1 404 Not Found\/","send_on":false,"analysis_alert_title":"404","analysis_alert_body":"not found","analysis_alert_body_false":"found"},"7":""}

你可以看到最后7在空。我该怎么做才能检查它是否为空？

Answer 1

只需使用optJSONObject(String name)代替getJSONObject(String name)：

返回按名称映射的值（如果存在）并且是JSONObject。否则返回null。

然后检查返回值。