HTTP/2 is still very much new to Java, and as such, there are just two libraries who support it – Jetty (from 9.3), and Netty (in alpha). If you’re going the Jetty way (as I have), you’ll need to add their ALPN library to your boot classpath.
Note: Jetty 9.3.x requires the use of Java 8.
A full library for this is available here, on GitHub.
Here’s a quick example:
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| package com.judepereira.jetty.apns.http2; | |
| import org.eclipse.jetty.client.HttpClient; | |
| import org.eclipse.jetty.client.api.ContentResponse; | |
| import org.eclipse.jetty.client.api.Request; | |
| import org.eclipse.jetty.client.util.StringContentProvider; | |
| import org.eclipse.jetty.http2.client.HTTP2Client; | |
| import org.eclipse.jetty.http2.client.http.HttpClientTransportOverHTTP2; | |
| import org.eclipse.jetty.util.ssl.SslContextFactory; | |
| import java.io.FileInputStream; | |
| import java.security.KeyStore; | |
| public class Main { | |
| public static void main(String[] args) throws Exception { | |
| HTTP2Client http2Client = new HTTP2Client(); | |
| http2Client.start(); | |
| KeyStore ks = KeyStore.getInstance("PKCS12"); | |
| // Ensure that the password is the same as the one used later in setKeyStorePassword() | |
| ks.load(new FileInputStream("MyProductionOrDevelopmentCertificate.p12"), "".toCharArray()); | |
| SslContextFactory ssl = new SslContextFactory(true); | |
| ssl.setKeyStore(ks); | |
| ssl.setKeyStorePassword(""); | |
| HttpClient client = new HttpClient(new HttpClientTransportOverHTTP2(http2Client), ssl); | |
| client.start(); | |
| // Change the API endpoint to api.development.push.apple.com if you're using a development certificate | |
| Request req = client.POST("https://api.push.apple.com") | |
| // Update your :path "/3/device/<your token>" | |
| .path("/3/device/b2482deaf55521b2ccd755d5817a39784cc0044e24s3523a4708c2fa08983bdf") | |
| .content(new StringContentProvider("{ \"aps\" : { \"alert\" : \"Hello\" } }")); | |
| ContentResponse response = req.send(); | |
| System.out.println("response code: " + response.getStatus()); | |
| // The response body is empty for successful requests | |
| System.out.println("response body: " + response.getContentAsString()); | |
| } | |
| } |