An enhanced HttpClient API was introduced in Java 9 as an experimental feature. With Java 11, now HttpClient is a standard. It is recommended to use instead of other HTTP Client APIs like Apache Http Client API. It is quite feature rich and now Java based applications can make HTTP requests without using any external dependency.
Steps
Following are the steps to use an HttpClient.
- Create HttpClient instance using HttpClient.newBuilder() instance
- Create HttpRequest instance using HttpRequest.newBuilder() instance
- Make a request using httpClient.send() and get a response object.
HttpApiRequest.java
import java.io.IOException;
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 Java11HttpRequest {
public static void main(String[] args) throws IOException, InterruptedException {
// 1. Create HttpClient object
HttpClient httpClient = HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_2)
.connectTimeout(Duration.ofSeconds(10))
.build();
// 2. Create HttpRequest object
HttpRequest request = HttpRequest.newBuilder()
.GET()
.uri(URI.create("https://www.google.com"))
.build();
// 3. Get HttpResponse
HttpResponse<String> response = httpClient.send(request,
HttpResponse.BodyHandlers.ofString());
// 4. Print http response
System.out.println("Content Type: " + response.headers().allValues("content-type"));
System.out.println("Status code: " + response.statusCode());
System.out.println("Body: " + response.body());
}
}
Output:
Content Type: [text/html; charset=ISO-8859-1]
Status code: 200
Body: <!doctype html><html itemscope="" itemtype="http://schema.org/WebPage" lang="en-IN"><head><meta content="text/html; charset=UTF-8" http-equiv="Content-Type"><meta content="/images/branding/googleg/1x/googleg_standard_color_128dp.png" itemprop="image"><title>Google</title><script nonce="1rhpqKatBAB2gYRzXZRwMg">(function(){window.google={kEI:'zBJOY_PWC9KI8gKJ76qAAw',kEXPI:'0,1302536,56873,6059,206,4804,2316,383,246,5,5367,1123753,1197793,380698,16114,28684,22430,1362,12313,17586,4998,13228,3847,10622,22741,5081,1593,1279,2742,149,1103,842,2194,4101,3514,606,2023,1777,520,14670,3227,2845,7,33770,1851,2614,13142,3,346,230,1014,1,5444,149,11323,2652,4,1528,2304,7039,22023,5708,7356,13659,4437,16786,5821,2536,4094,17,4035,3,3541,1,42154,2,14022,2715,11401,11623,5679,1020,2380,26571,2171,4569,6258,23418,1246,5841,14967,4333,8,7476,445,2,2,1,6960,16867,10960,7381,2,1399,14569,873,19633,8,1921,5784,3995,12415,6715,12192,4832,7934,3708,5374,122,700,4,1,2,2,2,2,8226,426,5265,785,1627,1204,1517,9739,14,82,950,1758,1182,482,274,196,1869,6536,86,933,14,37,2133,552,922,1936,818,1150,507,275,2824,217,743,498,21,3,86,456,1039,86,1539,1140,1108,333,3928,83,859,242,17,441,847,2,43,1,384,192,262,983,241,940,10,1189,107,979,86,1490,77,265,162,720,10,280,1066,58,1226,528,29,98,235,226,4,170,379,396,118,84,786,7,537,934,526,40,2,48,172,36,143,477,187,252,88,436,3,18,247,337,34,2,4,2,107,1137,111,186,271,27,3,379,17,503,821,121,136,789,1969,243,1,3,5319440,4000,5995358,475,41,2803376,3311,141,795,19735,1,1,346,1754,59,22,4,2,4,3,2,113,226,1,7451435,16496860,471,16,2772407,1269248,5058,13578,3406,11319,1197,498311,985487',kBL:'lHUN'};google.sn='webhp';google.kHL='en-IN';})();(function(){
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