Java example source code file (SpdyClient.java)

This example Java source code file (SpdyClient.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.

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Java - Java tags/keywords

applicationprotocolconfig, bootstrap, channel, eventloopgroup, exception, host, httprequest, httpresponseclienthandler, nioeventloopgroup, port, spdyclientinitializer, sslcontext, string

The SpdyClient.java Java example source code

/*
 * Copyright 2014 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.spdy.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpVersion;
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.util.InsecureTrustManagerFactory;

/**
 * An SPDY client that allows you to send HTTP GET to a SPDY server.
 * <p>
 * This class must be run with the JVM parameter: {@code java -Xbootclasspath/p:<path_to_npn_boot_jar> ...}. The
 * "path_to_npn_boot_jar" is the path on the file system for the NPN Boot Jar file which can be downloaded from Maven at
 * coordinates org.mortbay.jetty.npn:npn-boot. Different versions applies to different OpenJDK versions. See
 * <a href="http://www.eclipse.org/jetty/documentation/current/npn-chapter.html">Jetty docs for more information.
 * <p>
 * You may also use the {@code run-example.sh} script to start the client from the command line:
 * <pre>
 *     ./run-example.sh spdy-client
 * </pre>
 */
public final class SpdyClient {

    static final String HOST = System.getProperty("host", "127.0.0.1");
    static final int PORT = Integer.parseInt(System.getProperty("port", "8443"));

    public static void main(String[] args) throws Exception {
        // Configure SSL.
        final SslContext sslCtx = SslContextBuilder.forClient()
            .trustManager(InsecureTrustManagerFactory.INSTANCE)
            .applicationProtocolConfig(new ApplicationProtocolConfig(
                        Protocol.NPN,
                        // 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.SPDY_3_1,
                        ApplicationProtocolNames.HTTP_1_1))
            .build();

        HttpResponseClientHandler httpResponseHandler = new HttpResponseClientHandler();
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            Bootstrap b = new Bootstrap();
            b.group(workerGroup);
            b.channel(NioSocketChannel.class);
            b.option(ChannelOption.SO_KEEPALIVE, true);
            b.remoteAddress(HOST, PORT);
            b.handler(new SpdyClientInitializer(sslCtx, httpResponseHandler));

            // Start the client.
            Channel channel = b.connect().syncUninterruptibly().channel();
            System.out.println("Connected to " + HOST + ':' + PORT);

            // Create a GET request.
            HttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, "");
            request.headers().set(HttpHeaderNames.HOST, HOST);
            request.headers().set(HttpHeaderNames.ACCEPT_ENCODING, HttpHeaderValues.GZIP);

            // Send the GET request.
            channel.writeAndFlush(request).sync();

            // Waits for the complete HTTP response
            httpResponseHandler.queue().take().sync();
            System.out.println("Finished SPDY HTTP GET");

            // Wait until the connection is closed.
            channel.close().syncUninterruptibly();
        } finally {
            workerGroup.shutdownGracefully();
        }
    }
}