com.mylearn.netty.sample.websocket.client.WebSocketClient.java Source code

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Here is the source code for com.mylearn.netty.sample.websocket.client.WebSocketClient.java

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/*
 * Copyright 2012 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 com.mylearn.netty.sample.websocket.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.DefaultHttpHeaders;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
import io.netty.handler.codec.http.websocketx.WebSocketVersion;

import java.net.URI;

public class WebSocketClient {

    private final URI uri;

    public WebSocketClient(URI uri) {
        this.uri = uri;
    }

    public void run() throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            String protocol = uri.getScheme();
            if (!"ws".equals(protocol)) {
                throw new IllegalArgumentException("Unsupported protocol: " + protocol);
            }

            HttpHeaders customHeaders = new DefaultHttpHeaders();
            customHeaders.add("MyHeader", "MyValue");

            // Connect with V13 (RFC 6455 aka HyBi-17). You can change it to V08 or V00.
            // If you change it to V00, ping is not supported and remember to change
            // HttpResponseDecoder to WebSocketHttpResponseDecoder in the pipeline.
            final WebSocketClientHandler handler = new WebSocketClientHandler(WebSocketClientHandshakerFactory
                    .newHandshaker(uri, WebSocketVersion.V13, null, false, customHeaders));

            b.group(group).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() {
                @Override
                public void initChannel(SocketChannel ch) throws Exception {
                    ChannelPipeline pipeline = ch.pipeline();
                    pipeline.addLast("http-codec", new HttpClientCodec());
                    pipeline.addLast("aggregator", new HttpObjectAggregator(8192));
                    pipeline.addLast("ws-handler", handler);
                }
            });

            System.out.println("WebSocket Client connecting");
            Channel ch = b.connect(uri.getHost(), uri.getPort()).sync().channel();
            handler.handshakeFuture().sync();

            // Send 10 messages and wait for responses
            System.out.println("WebSocket Client sending message");
            for (int i = 0; i < 10; i++) {
                ch.writeAndFlush(new TextWebSocketFrame("Message #" + i));
            }

            // Ping
            System.out.println("WebSocket Client sending ping");
            ch.writeAndFlush(new PingWebSocketFrame(Unpooled.copiedBuffer(new byte[] { 1, 2, 3, 4, 5, 6 })));

            // Close
            System.out.println("WebSocket Client sending close");
            ch.writeAndFlush(new CloseWebSocketFrame());

            // WebSocketClientHandler will close the connection when the server
            // responds to the CloseWebSocketFrame.
            ch.closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        URI uri;
        if (args.length > 0) {
            uri = new URI(args[0]);
        } else {
            uri = new URI("ws://localhost:8080/websocket");
        }
        new WebSocketClient(uri).run();
    }
}