Java 11 HttpClient examples

Author: winterbe

src/com/winterbe/java11/HttpClientExamples.java

@@ -0,0 +1,77 @@
+package com.winterbe.java11;
+
+import java.io.IOException;
+import java.net.Authenticator;
+import java.net.PasswordAuthentication;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.time.Duration;
+
+public class HttpClientExamples {
+
+    public static void main(String[] args) throws IOException, InterruptedException {
+//        syncRequest();
+//        asyncRequest();
+//        postData();
+        basicAuth();
+    }
+
+    private static void syncRequest() throws IOException, InterruptedException {
+        var client = HttpClient.newHttpClient();
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create("https://winterbe.com"))
+                .build();
+        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+        System.out.println(response.body());
+    }
+
+    private static void asyncRequest() {
+        var client = HttpClient.newHttpClient();
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create("https://winterbe.com"))
+                .build();
+        client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                .thenApply(HttpResponse::body)
+                .thenAccept(System.out::println);
+    }
+
+    private static void postData() throws IOException, InterruptedException {
+        var client = HttpClient.newHttpClient();
+        var request = HttpRequest.newBuilder()
+                .uri(URI.create("https://postman-echo.com/post"))
+                .timeout(Duration.ofSeconds(30))
+                .version(HttpClient.Version.HTTP_2)
+                .header("Content-Type", "text/plain")
+                .POST(HttpRequest.BodyPublishers.ofString("Hi there!"))
+                .build();
+        var response = client.send(request, HttpResponse.BodyHandlers.ofString());
+        System.out.println(response.statusCode());      // 200
+    }
+
+    private static void basicAuth() throws IOException, InterruptedException {
+        var client = HttpClient.newHttpClient();
+        var request1 = HttpRequest.newBuilder()
+                .uri(URI.create("https://postman-echo.com/basic-auth"))
+                .build();
+        var response1 = client.send(request1, HttpResponse.BodyHandlers.ofString());
+        System.out.println(response1.statusCode());      // 401
+
+        var authClient = HttpClient
+                .newBuilder()
+                .authenticator(new Authenticator() {
+                    @Override
+                    protected PasswordAuthentication getPasswordAuthentication() {
+                        return new PasswordAuthentication("postman", "password".toCharArray());
+                    }
+                })
+                .build();
+        var request2 = HttpRequest.newBuilder()
+                .uri(URI.create("https://postman-echo.com/basic-auth"))
+                .build();
+        var response2 = authClient.send(request2, HttpResponse.BodyHandlers.ofString());
+        System.out.println(response2.statusCode());      // 200
+    }
+
+}