How can we update existing JSON data in Java using javax.json API?

JsonBuilderFactory The interface is a factory used to create JsonObjectBuilder instances, while JsonObjectBuilder is a factory used to create instances from scratch Builder for creating JsonObject models. This interface initializes an empty JSON object model and provides methods to add name/value pairs to the object model and return the result object. We can use the createObjectBuilder() method to create a JsonObjectBuilder instance for building JsonObject .

Syntax

JsonObjectBuilder createObjectBuilder()

In the following example, we can update the existing JSON data with the newly added data.

Example

import java.io.*;
import javax.json.*;
public class UpdateExistingJsonTest {
   public static void main(String[] args) throws Exception {
      String jsonString = "{\"id\":\"115\", \"name\":\"Raja\", \"address\":[{\"area\":\"Madhapur\", \"city\":\"Hyderabad\"}]}";
      StringReader reader = new StringReader(jsonString);
<strong>      </strong>JsonReader jsonReader = Json.createReader(reader);
      System.out.println("Existing JSON: \n" + jsonString);
      StringWriter writer = new StringWriter();
      JsonWriter jsonWriter = Json.createWriter(writer);
      JsonObject jsonObject = jsonReader.readObject();
      JsonBuilderFactory jsonBuilderFactory = Json.createBuilderFactory(null);
      JsonObjectBuilder jsonObjectBuilder = jsonBuilderFactory.createObjectBuilder();
      for(String key : jsonObject.keySet()) {
         jsonObjectBuilder.add(key, jsonObject.get(key));
      }
      jsonObjectBuilder.add("Contact Number", "9959984000");
      jsonObjectBuilder.add("Country", "India");
      jsonObject = jsonObjectBuilder.build();
      jsonWriter.writeObject(jsonObject);
      System.out.println("new JSON: \n" + jsonObject);
   }
}

Output

Existing JSON:
{"id":"115", "name":"Raja", "address":[{"area":"Madhapur", "city":"Hyderabad"}]}

new JSON:
{"id":"115","name":"Raja","address":[{"area":"Madhapur","city":"Hyderabad"}],"Contact Number":"9959984000","Country":"India"}

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