Javax.json: Get an object from json string

Step 1: Get JsonObject from json string.

JsonReader reader = Json.createReader(new StringReader(jsonString));
JsonObject jsonObject = reader.readObject();

 

Step 2: Populate java object from JsonObject.

int id = jsonObject.getInt("id");
String firstName = jsonObject.getString("firstName");
String lastName = jsonObject.getString("lastName");
		
String birthDate = jsonObject.getString("dateOfBirth");
DateFormat dateFormat = new SimpleDateFormat("DD/MM/YYYY");
Date dateOfBirth = dateFormat.parse(birthDate);
		
Employee emp = new Employee(id, firstName, lastName, dateOfBirth);

 

Find the below working application.

 

ObjectFromString.java

package com.sample.app;

import java.io.StringReader;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonReader;

import com.sample.app.model.Employee;

public class ObjectFromString {

	public static void main(String[] args) throws ParseException {
		String jsonString = "{\"firstName\":\"Ram\",\"lastName\":\"Gurram\",\"id\":32,\"dateOfBirth\":\"10/01/1985\"}";
		
		JsonReader reader = Json.createReader(new StringReader(jsonString));
		JsonObject jsonObject = reader.readObject();
		
		int id = jsonObject.getInt("id");
		String firstName = jsonObject.getString("firstName");
		String lastName = jsonObject.getString("lastName");
		
		String birthDate = jsonObject.getString("dateOfBirth");
		DateFormat dateFormat = new SimpleDateFormat("DD/MM/YYYY");
		Date dateOfBirth = dateFormat.parse(birthDate);
		
		Employee emp = new Employee(id, firstName, lastName, dateOfBirth);
		
		System.out.println(emp);
	}
}

 

Output

Employee [id=32, firstName=Ram, lastName=Gurram, dateOfBirth=Sun Dec 30 00:00:00 IST 1984]

 

 

 

 

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