# New HTTP Client in Java

Published 2023-06-08

This tutorial explains to you how to use the new HTTP Client in Java. We have an example for you as well.

This feature is introduced in Java 9, but become a standard in Java 11.

Please take a look at the following example and read carefully the comments. The code is self-explanatory.

From the base application downloaded from Spring Initializr, I updated the main class as below:

package com.example.demo;

import org.json.JSONObject;

import java.util.function.Function;

public class FindName  implements Function<String, String> {

  public String apply(String strIn) {
    JSONObject inputJSONOBject = new JSONObject(strIn);
    System.out.println("Inside FindName");

    return inputJSONOBject.get("name").toString();
package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import static java.time.temporal.ChronoUnit.SECONDS;

public class DemoApplication {

	public static void main(String[] args) throws IOException, InterruptedException, ExecutionException {

		SpringApplication.run(DemoApplication.class, args);

		final String url = "https://api.nationalize.io/?name=doru";

		//Send SYNC GET request
		HttpClient httpClient = HttpClient.newBuilder().build();
		HttpRequest httpRequest1 = HttpRequest.newBuilder(URI.create(url))
				// add a header to the request
				.headers("key1", "value1", "key2", "value2")
				.header("key3", "value3")
				// if you want to add a timeout
				.timeout(Duration.of(10, SECONDS))

		HttpResponse response1 = httpClient.send(httpRequest1, HttpResponse.BodyHandlers.ofString());

		System.out.println("Status code: " + response1.statusCode());
		System.out.println("Headers: " + response1.headers()
				.allValues("content type"));
		System.out.println("Body: " + response1.body());

		//Send ASYNC GET request
		FindName fn = new FindName();

		httpClient.sendAsync(httpRequest1, HttpResponse.BodyHandlers.ofString())
				// take the body from the request
				// apply a function to the result returned from the line above
				// print the result returned from the line above
				// join() waits for the stream to complete
				// if not present this thread will run in parallel with the main thread




When I run this code I get the following log:

Status code: 200
Headers: []
Body: {"country":[{"country_id":"RO","probability":0.849},{"country_id":"MD","probability":0.023},{"country_id":"AT","probability":0.011},{"country_id":"IE","probability":0.009},{"country_id":"CY","probability":0.009}],"name":"doru"}
Inside FindName

Process finished with exit code 0