--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/net/httpclient/BodyProcessorInputStreamTest.java Sun Nov 05 17:32:13 2017 +0000
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.net.URI;
+import jdk.incubator.http.HttpClient;
+import jdk.incubator.http.HttpHeaders;
+import jdk.incubator.http.HttpRequest;
+import jdk.incubator.http.HttpResponse;
+import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Locale;
+import java.util.Optional;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Flow;
+import java.util.stream.Stream;
+import static java.lang.System.err;
+
+/*
+ * @test
+ * @bug 8187503
+ * @summary An example on how to read a response body with InputStream...
+ * @run main/othervm -Dtest.debug=true BodyProcessorInputStreamTest
+ * @author daniel fuchs
+ */
+public class BodyProcessorInputStreamTest {
+
+ public static boolean DEBUG = Boolean.getBoolean("test.debug");
+
+ /**
+ * Examine the response headers to figure out the charset used to
+ * encode the body content.
+ * If the content type is not textual, returns an empty Optional.
+ * Otherwise, returns the body content's charset, defaulting to
+ * ISO-8859-1 if none is explicitly specified.
+ * @param headers The response headers.
+ * @return The charset to use for decoding the response body, if
+ * the response body content is text/...
+ */
+ public static Optional<Charset> getCharset(HttpHeaders headers) {
+ Optional<String> contentType = headers.firstValue("Content-Type");
+ Optional<Charset> charset = Optional.empty();
+ if (contentType.isPresent()) {
+ final String[] values = contentType.get().split(";");
+ if (values[0].startsWith("text/")) {
+ charset = Optional.of(Stream.of(values)
+ .map(x -> x.toLowerCase(Locale.ROOT))
+ .map(String::trim)
+ .filter(x -> x.startsWith("charset="))
+ .map(x -> x.substring("charset=".length()))
+ .findFirst()
+ .orElse("ISO-8859-1"))
+ .map(Charset::forName);
+ }
+ }
+ return charset;
+ }
+
+ public static void main(String[] args) throws Exception {
+ HttpClient client = HttpClient.newHttpClient();
+ HttpRequest request = HttpRequest
+ .newBuilder(new URI("http://hg.openjdk.java.net/jdk9/sandbox/jdk/shortlog/http-client-branch/"))
+ .GET()
+ .build();
+
+ // This example shows how to return an InputStream that can be used to
+ // start reading the response body before the response is fully received.
+ // In comparison, the snipet below (which uses
+ // HttpResponse.BodyHandler.asString()) obviously will not return before the
+ // response body is fully read:
+ //
+ // System.out.println(
+ // client.sendAsync(request, HttpResponse.BodyHandler.asString()).get().body());
+
+ CompletableFuture<HttpResponse<InputStream>> handle =
+ client.sendAsync(request, HttpResponse.BodyHandler.asInputStream());
+ if (DEBUG) err.println("Request sent");
+
+ HttpResponse<InputStream> pending = handle.get();
+
+ // At this point, the response headers have been received, but the
+ // response body may not have arrived yet. This comes from
+ // the implementation of HttpResponseInputStream::getBody above,
+ // which returns an already completed completion stage, without
+ // waiting for any data.
+ // We can therefore access the headers - and the body, which
+ // is our live InputStream, without waiting...
+ HttpHeaders responseHeaders = pending.headers();
+
+ // Get the charset declared in the response headers.
+ // The optional will be empty if the content type is not
+ // of type text/...
+ Optional<Charset> charset = getCharset(responseHeaders);
+
+ try (InputStream is = pending.body();
+ // We assume a textual content type. Construct an InputStream
+ // Reader with the appropriate Charset.
+ // charset.get() will throw NPE if the content is not textual.
+ Reader r = new InputStreamReader(is, charset.get())) {
+
+ char[] buff = new char[32];
+ int off=0, n=0;
+ if (DEBUG) err.println("Start receiving response body");
+ if (DEBUG) err.println("Charset: " + charset.get());
+
+ // Start consuming the InputStream as the data arrives.
+ // Will block until there is something to read...
+ while ((n = r.read(buff, off, buff.length - off)) > 0) {
+ assert (buff.length - off) > 0;
+ assert n <= (buff.length - off);
+ if (n == (buff.length - off)) {
+ System.out.print(buff);
+ off = 0;
+ } else {
+ off += n;
+ }
+ assert off < buff.length;
+ }
+
+ // last call to read may not have filled 'buff' completely.
+ // flush out the remaining characters.
+ assert off >= 0 && off < buff.length;
+ for (int i=0; i < off; i++) {
+ System.out.print(buff[i]);
+ }
+
+ // We're done!
+ System.out.println("Done!");
+ }
+ }
+
+}