使用 json-simple (JAVA) 删除 JSON 文件的部分

Question

Hello I want to delete an section of a JSON File in Java with JSON-Simple.

The JSON File

{
        "MYID": {
            "user": "name",
            "task": "aufgabe",
            "status": "true"
        },
        "MYID2": {
            "user": "name2",
            "task": "aufgabe2",
            "status": "false"
        },
        "MYID3": {
            "user": "name3",
            "task": "aufgabe3",
            "status": "true"
        }
}

I want to delete the complete "MYID" section. I already tried jsonObject.remove("MYID"); but it don't worked.

Answer 1

Try:

jsonObj.getAsJsonObject("").remove("MYID");

This approach requires a String argument. First try to print the jsonObject (jsonObect.toString()) or debug it. That should be a Map with another inner Maps and see the structure of such object to remove the part you are interested in.

Answer 2

I successfully removed element with this code:

import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

class SimpleJson {
    public static void main(String[] args) throws IOException {
        JSONObject jObject = (JSONObject) JSONValue.parse(json);
        jObject.remove("MYID3");
        System.out.println(jObject);
        try (FileWriter writer = new FileWriter(new File("/path/result2.json"))) {
            jObject.writeJSONString(writer);
        }

        // java 11 
        // Files.writeString(Path.of("/path/dir1", "result.json"), jObject.toJSONString());
    }
    ...
}

Dependency: com.googlecode.json-simple json-simple 1.1.1

Output :

{
  "MYID": {
    "task": "aufgabe",
    "user": "name",
    "status": "true"
  },
  "MYID2": {
    "task": "aufgabe2",
    "user": "name2",
    "status": "false"
  }
}