JavaでJSONデータを含むHTTP POSTリクエストを送信するにはどうすればよいですか?

// Import required libraries
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;

public class HttpJsonPost {

    public static void main(String[] args) {
        try {
            // Update the URL and JSON data accordingly
            String url = "http://yoururl";
            String jsonString = "{\"name\":\"xyz\",\"age\":\"20\"}";

            // Create an HTTP client
            HttpClient httpClient = HttpClientBuilder.create().build();

            // Prepare the POST request
            HttpPost request = new HttpPost(url);
            StringEntity params = new StringEntity(jsonString);
            request.addHeader("content-type", "application/x-www-form-urlencoded");
            request.setEntity(params);

            // Execute the request
            httpClient.execute(request);
        } catch (Exception ex) {
            // Handle any exceptions
        }
    }
}