如何从Json字符串创建Java JSON对象？

Question

I'm trying to create a Json Object in java from a Json String but i'm not using it in the proper way since the json object looks empty

Here is my Json arriving from Ajax and it is composed by an array and a single variable:

{"arrayUsers":["53","54"],"idMansione":"1"}

Here is my Java function where i'm trying to create the Json Object:

import org.json.JSONArray;
import org.json.JSONObject;

...

    public ResponseEntity<String> assignTask(String json) {

        //Here i'm trying to create the object

        JSONObject mainObj = new JSONObject();
        mainObj.put("arrayUsers", json);
        System.out.print(mainObj); //looks empty

        return new ResponseEntity<String>("OK", HttpStatus.OK);
    }

Answer 1

Try this:

JSONParser parser = new JSONParser();
JSONObject json = (JSONObject) parser.parse(stringToParse);

Answer 2

只是：

    JSONObject mainObj = new JSONObject(json);