Read JSON file with JSONParser not available in the jarfile

Question

I am trying to read a json file and convert it to the jsonObject and when I searched on how to do it, I came across the method to user

JSONParser parser= new JSONParse();

But the version of org.json I am using in the code is "20180803". It does not contain JSONParser. Has it been removed from the org.json package? If so what is the new class or method that I could use to read a json file and convert it to a json object.

My dependency is given below :

       <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20180813</version>
        </dependency>

I would suggest explore Jackson library for Json processing – dkb Mar 21 '19 at 05:35 — dkb, Mar 21 '19 at 05:35

score 2 · Answer 1 · edited Mar 21 '19 at 05:47

2

Hi you can use simple JSON. You just need to add in your pom.xml file:

<dependency>
        <groupId>com.googlecode.json-simple</groupId>
        <artifactId>json-simple</artifactId>
</dependency>

Sample code

public static JSONObject convertJsonStingToJson(String jsonString) {
    JSONParser parser = new JSONParser();
    return  json = (JSONObject) parser.parse(jsonString);
}

edited Mar 21 '19 at 05:47

Pavel Smirnov

4,611
3
18
28

answered Mar 21 '19 at 05:38

Vivek kumar

31
3

score 1 · Answer 2 · answered Mar 21 '19 at 06:46

org.json library has very simple API which does not have JSONParser but has JSONTokener. We can construct JSONObject or JSONArray directly from String:

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

public class JsonApp {

    public static void main(String[] args) {
        // JSON Object
        String object = "{\"p1\":\"v1\", \"p2\":2}";
        JSONObject jsonObject = new JSONObject(object);
        System.out.println(jsonObject);

        // JSON Array
        String array = "[{\"p1\":\"v1\", \"p2\":2}]";
        JSONArray jsonArray = new JSONArray(array);
        System.out.println(jsonArray);
    }
}

Above code prints:

{"p1":"v1", "p2":2}
[{"p1":"v1","p2":2}]

You need to notice that it depends from JSON payload which class to use: if JSON starts from { use JSONObject, if from [ - use JSONArray. In other case JSON payload is invalid.

As it mentioned in other answers, if you can you should definitely use Jackson or Gson

finx · Answer 3 · 2019-03-21T21:27:08.670

0

The short answer to your question is: No, it was not removed, because it never existed.

I think you are mentioning a library, and trying to use another one. Anyway, if you really want to use org.json, you can find how here

JSONObject jsonObject = new JSONObject(instanceOfClass1);
String myJson = jsonObject.toString();

edited Mar 21 '19 at 21:27

answered Mar 21 '19 at 05:50

finx

1,293
9
9

score 0 · Answer 4 · answered Mar 21 '19 at 05:57

Add following dependency in build file

//json processing
implementation("com.fasterxml.jackson.core:jackson-core:2.9.8")
implementation("com.fasterxml.jackson.core:jackson-annotations:2.9.8")
implementation("com.fasterxml.jackson.core:jackson-databind:2.9.8")

a.json file

{
  "a": "b"
}

code:

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.FileInputStream;
import java.io.InputStream;


public class App {

    public static void main(String[] args) throws Exception {
        ObjectMapper objectMapper = new ObjectMapper();
        InputStream input = new FileInputStream("a.json");
        JsonNode obj =  objectMapper.readTree(input);
        System.out.println(obj.get("a")); // "b"
    }
}

Read JSON file with JSONParser not available in the jarfile

4 Answers4