你可以这样做：

import org.json.JSONObject;

List<String> input = List.of("customer.name", "customer.phone", "shop.address", "nr");

JSONObject root = new JSONObject();

for (String s : input) {
  // Split the string by the '.' character to get the keys
  String[] keys = s.split("\\.");

  JSONObject obj = root;
  for (int i = 0; i < keys.length; i++) {
    String key = keys[i];
    if (i < keys.length - 1) {
      if (!obj.has(key)) {
        obj.put(key, new JSONObject());
      }
      obj = obj.getJSONObject(key);
    } else {
      obj.put(key, "");
    }
  }
}