在 Java 中访问 JSONObject 中的键/值

Question

In java I have the following code:

import org.json.JSONObject;

JSONObject obj = new JSONObject();
obj.put("firstKey", new JSONObject());

Now in the new object corresponding to the key "firstKey", I want to start inserting new key-value pairs, but I'm not sure how to do this. I've tried oppJSON.get("firstKey").put("one","two"); but this doesn't work - does anyone have any ideas?

Answer 1

JSONObject 具有特定的获取方法，如getString 、 getInt 、 getDouble等。在您的情况下，您需要getJSONObject

oppJSON.getJSONObject("firstKey").put("one","two");

Answer 2

Class JSONObject implements a Map without generics. So while you can use Map<String, String> , JSONObject is the equivalent of Map<Object, Object> . Everything pulled out of it using get has to be cast to its type.

Try ((JSONObject)obj.get("firstKey")).put("one", "two")