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WebsiteStatus.java
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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;
import static java.util.stream.Collectors.toList;
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).collect(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 (valid) {
System.out.printf("[SUCCESS] Verified %s%n", uri);
} else {
System.out.printf("[FAILURE] Failed to verify%s%n", uri);
}
});
}
}