public static void main(String[] args) {
        String context = "\"{\"business_scene\":\"scanApp\"}";
        JSONObject jsonMap = JSONObject.fromObject(context);
        System.out.println(ToStringBuilder.reflectionToString(jsonMap));
    }

Exception in thread "main" net.sf.json.JSONException: A JSONObject text must begin with '{' at character 1 of "{"business_scene":"scanApp"}
	at net.sf.json.util.JSONTokener.SyntaxError(JSONTokener.java:512)
	at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:1096)
	at net.sf.json.JSONObject._fromString(JSONObject.java:1317)
	at net.sf.json.JSONObject.fromObject(JSONObject.java:185)
	at net.sf.json.JSONObject.fromObject(JSONObject.java:154)