Commit 7047da6

Asynchronously checks status of multiple websites.

package com.zetcode;

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.List;

import java.util.concurrent.CompletableFuture;

import java.util.stream.Stream;

public class WebSiteStatus {

public static void main(String[] args) {

List<URI> uris = Stream

.of("https://www.google.com/", "https://clojure.org",

"https://www.rust-lang.org", "https://golang.org",

"https://www.python.org",

"https://code.visualstudio.com", "https://ifconfig.me",

"http://termbin.com", "https://www.github.com/")

.map(URI::create).toList();

HttpClient httpClient = HttpClient.newBuilder()

.connectTimeout(Duration.ofSeconds(10))

.followRedirects(HttpClient.Redirect.ALWAYS).build();

var futures = uris.stream().map(uri -> verifyUri(httpClient, uri))

.toArray(CompletableFuture[]::new);

CompletableFuture.allOf(futures).join();

}

private static CompletableFuture<Void> verifyUri(HttpClient httpClient,

URI uri) {

HttpRequest request = HttpRequest.newBuilder()

.timeout(Duration.ofSeconds(5)).uri(uri).build();

return httpClient

.sendAsync(request, HttpResponse.BodyHandlers.discarding())

.thenApply(HttpResponse::statusCode)

.thenApply(statusCode -> statusCode == 200)

.exceptionally(ex -> false).thenAccept(valid -> {

if (Boolean.TRUE.equals(valid)) {

System.out.printf("[SUCCESS] Verified %s%n", uri);

} else {

System.out.printf("[FAILURE] Failed to verify%s%n",

uri);

}

});

}

}

```