Pierwszy przykład java.net.http

P01-JavaSE/src/main/java/pcz/p57_http/HttpClient1_PobierzIWypisz.java

+package pcz.p57_http;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.net.http.HttpResponse.BodyHandlers;
+
+public class HttpClient1_PobierzIWypisz {
+
+    public static void main(String[] args) {
+        final String ADRES = "http://api.nbp.pl/api/exchangerates/tables/a/";
+
+        try {
+            System.out.println("Startujemy...");
+            URI uri = new URI(ADRES);
+            HttpClient httpClient = HttpClient.newHttpClient();
+            System.out.println("Mam klienta: " + httpClient);
+            System.out.println("Wysyłam zapytanie...");
+            HttpRequest request = HttpRequest.newBuilder(uri).build();
+            HttpResponse<String> response = httpClient.send(request, BodyHandlers.ofString());
+            System.out.println("Mam odpowiedź: " + response);
+            System.out.println("Kod: " + response.statusCode());
+            System.out.println("Content-Type: " + response.headers().firstValue("Content-Type").orElse("--nieokreślony--"));
+            String body = response.body();
+            System.out.println("Rozmiar treści: " + body.length());
+            System.out.println(body.substring(0, 80));
+            System.out.println("Gotowe.");
+        } catch(Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+}