java JSONObject与Map互相转换

private Map<String, String>  options = new HashMap<String, String>();private void parseOptions(JSONObject json) throws JSONException {    Iterator<String> iter = json.keys();    while (iter.hasNext()) {        String key = iter.next();        options.put(key, json.getString(key));    }}private JSONObject optionsToJSON() throws JSONException {    JSONObject json = new JSONObject();    Iterator<String> iter = options.keySet().iterator();    while (iter.hasNext()) {        String key = iter.next();        json.put(key, options.get(key));    }    return json;}