HttpClient httpClient = HttpClient.newHttpClient();

​

URI fakePostService = URI.create("https://jsonplaceholder.typicode.com/posts");

String bookData = "{\"title\":\"The Invisible Man\", \"author\":\"H. G. Wells\"}";

​

HttpRequest request = HttpRequest.newBuilder()

        .uri(fakePostService)

        .header("Content-Type", "application/json") // we specify that we send a JSON

        .POST(HttpRequest.BodyPublishers.ofString(bookData))

        .build();

​

try {

    var response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());

    System.out.println(response.statusCode()); // 201 if everything is OK

    System.out.println(response.body());       // a JSON response with ID

} catch (Exception e) {

    System.out.println("We cannot send data. Please, try later.");

}