Merge pull request #11272 from Rafael-Lopez/feature-JAVA-6406

JAVA-6406: Update 'Exploring the New HTTP Client in Java' article
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kwoyke 2021-10-04 09:10:14 +02:00 committed by GitHub
commit 3d1d04d697
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@ -6,7 +6,6 @@ This module contains articles about core Java features that have been introduced
- [New Features in Java 9](https://www.baeldung.com/new-java-9)
- [Java 9 Variable Handles Demystified](http://www.baeldung.com/java-variable-handles)
- [Exploring the New HTTP Client in Java 9 and 11](http://www.baeldung.com/java-9-http-client)
- [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
- [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)
- [Introduction to Java 9 StackWalking API](https://www.baeldung.com/java-9-stackwalking-api)

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/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.baeldung.httpclient;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpRequest.BodyProcessor;
import jdk.incubator.http.HttpResponse;
import jdk.incubator.http.HttpResponse.BodyHandler;
/**
*
* @author pkaria
*/
public class HttpClientExample {
public static void main(String[] args) throws Exception {
httpGetRequest();
httpPostRequest();
asynchronousRequest();
asynchronousMultipleRequests();
}
public static void httpGetRequest() throws URISyntaxException, IOException, InterruptedException {
HttpClient client = HttpClient.newHttpClient();
URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
HttpRequest request = HttpRequest.newBuilder(httpURI).GET()
.headers("Accept-Enconding", "gzip, deflate").build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandler.asString());
String responseBody = response.body();
int responseStatusCode = response.statusCode();
System.out.println(responseBody);
}
public static void httpPostRequest() throws URISyntaxException, IOException, InterruptedException {
HttpClient client = HttpClient
.newBuilder()
.build();
HttpRequest request = HttpRequest
.newBuilder(new URI("http://jsonplaceholder.typicode.com/posts"))
.POST(BodyProcessor.fromString("Sample Post Request"))
.build();
HttpResponse<String> response
= client.send(request, HttpResponse.BodyHandler.asString());
String responseBody = response.body();
System.out.println(responseBody);
}
public static void asynchronousRequest() throws URISyntaxException {
HttpClient client = HttpClient.newHttpClient();
URI httpURI = new URI("http://jsonplaceholder.typicode.com/posts/1");
HttpRequest request = HttpRequest.newBuilder(httpURI).GET().build();
CompletableFuture<HttpResponse<String>> futureResponse = client.sendAsync(request,
HttpResponse.BodyHandler.asString());
}
public static void asynchronousMultipleRequests() throws URISyntaxException {
List<URI> targets = Arrays.asList(new URI("http://jsonplaceholder.typicode.com/posts/1"), new URI("http://jsonplaceholder.typicode.com/posts/2"));
HttpClient client = HttpClient.newHttpClient();
List<CompletableFuture<File>> futures = targets
.stream()
.map(target -> client
.sendAsync(
HttpRequest.newBuilder(target)
.GET()
.build(),
BodyHandler.asFile(Paths.get("base", target.getPath())))
.thenApply(response -> response.body())
.thenApply(path -> path.toFile()))
.collect(Collectors.toList());
}
}

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module com.baeldung.httpclient {
requires jdk.incubator.httpclient;
}

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package com.baeldung.java9.httpclient;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpResponse;
import org.junit.Test;
import java.io.IOException;
import java.net.*;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.collection.IsEmptyCollection.empty;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpClientIntegrationTest {
@Test
public void shouldReturnSampleDataContentWhenConnectViaSystemProxy() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromString("Sample body"))
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.proxy(ProxySelector.getDefault())
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample body"));
}
@Test
public void shouldNotFollowRedirectWhenSetToDefaultNever() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_MOVED_PERM));
assertThat(response.body(), containsString(""));
}
@Test
public void shouldFollowRedirectWhenSetToAlways() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.ALWAYS)
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.finalRequest()
.uri()
.toString(), equalTo("https://stackoverflow.com/"));
}
@Test
public void shouldReturnOKStatusForAuthenticatedAccess() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/basic-auth"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.authenticator(new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("postman", "password".toCharArray());
}
})
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldSendRequestAsync() throws URISyntaxException, InterruptedException, ExecutionException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromString("Sample body"))
.build();
CompletableFuture<HttpResponse<String>> response = HttpClient.newBuilder()
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
assertThat(response.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldUseJustTwoThreadWhenProcessingSendAsyncRequest() throws URISyntaxException, InterruptedException, ExecutionException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
ExecutorService executorService = Executors.newFixedThreadPool(2);
CompletableFuture<HttpResponse<String>> response1 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
CompletableFuture<HttpResponse<String>> response2 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
CompletableFuture<HttpResponse<String>> response3 = HttpClient.newBuilder()
.executor(executorService)
.build()
.sendAsync(request, HttpResponse.BodyHandler.asString());
CompletableFuture.allOf(response1, response2, response3)
.join();
assertThat(response1.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response2.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response3.get()
.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldNotStoreCookieWhenPolicyAcceptNone() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpClient httpClient = HttpClient.newBuilder()
.cookieManager(new CookieManager(null, CookiePolicy.ACCEPT_NONE))
.build();
httpClient.send(request, HttpResponse.BodyHandler.asString());
assertThat(httpClient.cookieManager()
.get()
.getCookieStore()
.getCookies(), empty());
}
@Test
public void shouldStoreCookieWhenPolicyAcceptAll() throws URISyntaxException, IOException, InterruptedException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpClient httpClient = HttpClient.newBuilder()
.cookieManager(new CookieManager(null, CookiePolicy.ACCEPT_ALL))
.build();
httpClient.send(request, HttpResponse.BodyHandler.asString());
assertThat(httpClient.cookieManager()
.get()
.getCookieStore()
.getCookies(), not(empty()));
}
@Test
public void shouldProcessMultipleRequestViaStream() throws URISyntaxException, ExecutionException, InterruptedException {
List<URI> targets = Arrays.asList(new URI("https://postman-echo.com/get?foo1=bar1"), new URI("https://postman-echo.com/get?foo2=bar2"));
HttpClient client = HttpClient.newHttpClient();
List<CompletableFuture<String>> futures = targets.stream()
.map(target -> client.sendAsync(HttpRequest.newBuilder(target)
.GET()
.build(), HttpResponse.BodyHandler.asString())
.thenApply(response -> response.body()))
.collect(Collectors.toList());
CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]))
.join();
if (futures.get(0)
.get()
.contains("foo1")) {
assertThat(futures.get(0)
.get(), containsString("bar1"));
assertThat(futures.get(1)
.get(), containsString("bar2"));
} else {
assertThat(futures.get(1)
.get(), containsString("bar2"));
assertThat(futures.get(1)
.get(), containsString("bar1"));
}
}
}

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package com.baeldung.java9.httpclient;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpResponse;
import org.junit.Test;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Paths;
import java.security.NoSuchAlgorithmException;
import java.time.Duration;
import static java.time.temporal.ChronoUnit.SECONDS;
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpRequestIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldUseHttp2WhenWebsiteUsesHttp2() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://stackoverflow.com"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.version(), equalTo(HttpClient.Version.HTTP_2));
}
@Test
public void shouldFallbackToHttp1_1WhenWebsiteDoesNotUseHttp2() throws IOException, InterruptedException, URISyntaxException, NoSuchAlgorithmException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.version(HttpClient.Version.HTTP_2)
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.version(), equalTo(HttpClient.Version.HTTP_1_1));
}
@Test
public void shouldReturnStatusOKWhenSendGetRequestWithDummyHeaders() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.headers("key1", "value1", "key2", "value2")
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnStatusOKWhenSendGetRequestTimeoutSet() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.timeout(Duration.of(10, SECONDS))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnNoContentWhenPostWithNoBody() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.POST(HttpRequest.noBody())
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithBodyText() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromString("Sample request body"))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithInputStream() throws IOException, InterruptedException, URISyntaxException {
byte[] sampleData = "Sample request body".getBytes();
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromInputStream(() -> new ByteArrayInputStream(sampleData)))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithByteArrayProcessorStream() throws IOException, InterruptedException, URISyntaxException {
byte[] sampleData = "Sample request body".getBytes();
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromByteArray(sampleData))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample request body"));
}
@Test
public void shouldReturnSampleDataContentWhenPostWithFileProcessorStream() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/post"))
.headers("Content-Type", "text/plain;charset=UTF-8")
.POST(HttpRequest.BodyProcessor.fromFile(Paths.get("src/test/resources/sample.txt")))
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), containsString("Sample file content"));
}
}

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package com.baeldung.java9.httpclient;
import jdk.incubator.http.HttpClient;
import jdk.incubator.http.HttpRequest;
import jdk.incubator.http.HttpResponse;
import org.junit.Test;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.Matchers.isEmptyString;
import static org.hamcrest.core.IsNot.not;
import static org.junit.Assert.assertThat;
/**
* Created by adam.
*/
public class HttpResponseIntegrationTest {
@Test
public void shouldReturnStatusOKWhenSendGetRequest() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("https://postman-echo.com/get"))
.GET()
.build();
HttpResponse<String> response = HttpClient.newHttpClient()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(response.statusCode(), equalTo(HttpURLConnection.HTTP_OK));
assertThat(response.body(), not(isEmptyString()));
}
@Test
public void shouldResponseURIDifferentThanRequestUIRWhenRedirect() throws IOException, InterruptedException, URISyntaxException {
HttpRequest request = HttpRequest.newBuilder()
.uri(new URI("http://stackoverflow.com"))
.version(HttpClient.Version.HTTP_1_1)
.GET()
.build();
HttpResponse<String> response = HttpClient.newBuilder()
.followRedirects(HttpClient.Redirect.ALWAYS)
.build()
.send(request, HttpResponse.BodyHandler.asString());
assertThat(request.uri()
.toString(), equalTo("http://stackoverflow.com"));
assertThat(response.uri()
.toString(), equalTo("https://stackoverflow.com/"));
}
}