In below example, it uses JSONParser to read and display JSON data from a file named “test.json“ using JSON.simple, a simple Java library for JSON processing.
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 |
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 JsonSimpleExample { public static void main(String[] args) { JSONParser parser = new JSONParser(); try { Object obj = parser.parse(new FileReader("c:\\test.json")); JSONObject jsonObject = (JSONObject) obj; String name = (String) jsonObject.get("name"); System.out.println(name); long age = (Long) jsonObject.get("age"); System.out.println(age); // loop array JSONArray msg = (JSONArray) jsonObject.get("messages"); Iterator < String > iterator = msg.iterator(); while (iterator.hasNext()) { System.out.println(iterator.next()); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (ParseException e) { e.printStackTrace(); } } } |
Output:
prasanna
25
msg 1
msg 2
msg 3
25
msg 1
msg 2
msg 3