Java example source code file (Http2Server.java)

This example Java source code file (Http2Server.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

applicationprotocolconfig, certificateexception, channelfuture, channelinitializer, eventloopgroup, exception, http2orhttphandler, http2server, net, override, port, selfsignedcertificate, serverbootstrap, ssl, sslcontext, sslexception

The Http2Server.java Java example source code

/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package io.netty.example.http2.tiles;

import static io.netty.handler.codec.http2.Http2SecurityUtil.CIPHERS;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.ssl.ApplicationProtocolConfig;
import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
import io.netty.handler.ssl.ApplicationProtocolNames;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.SupportedCipherSuiteFilter;
import io.netty.handler.ssl.util.SelfSignedCertificate;

import java.security.cert.CertificateException;

import javax.net.ssl.SSLException;

/**
 * Demonstrates a Http2 server using Netty to display a bunch of images and
 * simulate latency. It is a Netty version of the <a href="https://http2.golang.org/gophertiles?latency=0">
 * Go lang HTTP2 tiles demo</a>.
 */
public class Http2Server {

    public static final int PORT = Integer.parseInt(System.getProperty("http2-port", "8443"));

    private final EventLoopGroup group;

    public Http2Server(EventLoopGroup eventLoopGroup) {
        group = eventLoopGroup;
    }

    public ChannelFuture start() throws Exception {
        final SslContext sslCtx = configureTLS();
        ServerBootstrap b = new ServerBootstrap();
        b.option(ChannelOption.SO_BACKLOG, 1024);
        b.group(group).channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<SocketChannel>() {
            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                ch.pipeline().addLast(sslCtx.newHandler(ch.alloc()), new Http2OrHttpHandler());
            }
        });

        Channel ch = b.bind(PORT).sync().channel();
        return ch.closeFuture();
    }

    private static SslContext configureTLS() throws CertificateException, SSLException {
        SelfSignedCertificate ssc = new SelfSignedCertificate();
        ApplicationProtocolConfig apn = new ApplicationProtocolConfig(
                Protocol.ALPN,
                // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                SelectorFailureBehavior.NO_ADVERTISE,
                // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                SelectedListenerFailureBehavior.ACCEPT,
                ApplicationProtocolNames.HTTP_2,
                ApplicationProtocolNames.HTTP_1_1);

        return SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey(), null)
                                .ciphers(CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
                                .applicationProtocolConfig(apn).build();
    }
}