Read Write File JSON Menggunakan Java

 

untuk membuat contoh membaca dan menulis file JSON dengan Java diperlukan library :

JSON Simple Library : json-simple.jar, library ini bisa di download pada salah satu link download ini   

Berikut adalah cara read dan write file JSON menggunakan Java :

1. Write

1.1. Buat file WriteJson.java 

import java.io.FileWriter;

import java.io.IOException;

import org.json.simple.JSONArray;

import org.json.simple.JSONObject;

public class WriteJson {

    public static void main(String[] args) {

    JSONObject obj = new JSONObject();

    obj.put("nama", "Amir");

    obj.put("sex", "Laki-Laki");

    obj.put("umur", new Integer(23));

 

    JSONArray listHobbies = new JSONArray();

    listHobbies.add("Main Games");

    listHobbies.add("Main Bola");

    listHobbies.add("Melawak");

 

    obj.put("hobi", listHobbies);

 

    try {

        FileWriter file = new FileWriter("d:\\filejson.json");

        file.write(obj.toJSONString());

        file.flush();

        file.close();

 

    } catch (IOException e) {

        e.printStackTrace();

    }

    System.out.print(obj);

     }

}

1.2. Jika dijalankan akan menghasilkan file JSON : fileJSON.json dengan isi 

{"sex":"Laki-laki", "hobi":["Main Games", "Main Bola", "Melawak"],"nama":"Amir", "Umur":23}

2. Read 

2.1. Buat file java untuk membaca JSON : ReadJson.java

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.util.Iterator;

import org.json.simple.JSONArray;

import org.json.simple.JSONObject;

import org.json.simple.parser.JSONParser;

import org.json.simple.parser.ParseException;

public class ReadJson {

    public static void main(String[] args){

JSONParser parser = new JSONParser();

try {

  Object obj = parser.parse(new FileReader("d:\\filejson.json"));

 

  JSONObject jsonObject = (JSONObject) obj;

  String nama = (String) jsonObject.get("nama");

  System.out.println("Nama = "+nama);

  String gender = (String) jsonObject.get("sex");

  System.out.println("Jenis Kelamin = "+sex);

  long umur = (Long) jsonObject.get("umur");

  System.out.println("Usia = "+umur);

  System.out.println("Hobi = ");

  // looping array hoby

  JSONArray hobbies = (JSONArray) jsonObject.get("hobi");

  Iterator iterator = hobbies.iterator();

  while (iterator.hasNext()) {

System.out.println("\t - " + iterator.next());

  }

 

} catch (FileNotFoundException ex) {

   ex.printStackTrace();

} catch (IOException ex) {

   ex.printStackTrace();

} catch (ParseException ex) {

   ex.printStackTrace();

}

    }

}

2.2. Jika dijalankan maka akan menampilkan :