1，客户端启动类

package test3;import io.netty.bootstrap.Bootstrap;import io.netty.buffer.Unpooled;import io.netty.channel.Channel;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInitializer;import io.netty.channel.ChannelPipeline;import io.netty.channel.EventLoopGroup;import io.netty.channel.group.ChannelGroup;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.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.WebSocketFrame;import io.netty.handler.codec.http.websocketx.WebSocketVersion;import io.netty.handler.ssl.SslContext;import io.netty.handler.ssl.SslContextBuilder;import io.netty.handler.ssl.util.InsecureTrustManagerFactory;import java.io.BufferedReader;import java.io.InputStreamReader;import java.net.URI;public final class WebSocketClient {    static final String URL = System.getProperty("url", "ws://127.0.0.1:5688/ws");    public void connect(String URL, ChannelGroup clients, ChannelHandlerContext ctx) throws Exception {        URI uri = new URI(URL);        String scheme = uri.getScheme() == null ? "ws" : uri.getScheme();        final String host = uri.getHost() == null ? "127.0.0.1" : uri.getHost();        final int port;        if (uri.getPort() == -1) {            if ("ws".equalsIgnoreCase(scheme)) {                port = 80;            } else if ("wss".equalsIgnoreCase(scheme)) {                port = 443;            } else {                port = -1;            }        } else {            port = uri.getPort();        }        if (!"ws".equalsIgnoreCase(scheme) && !"wss".equalsIgnoreCase(scheme)) {            System.err.println("Only WS(S) is supported.");            return;        }        final boolean ssl = "wss".equalsIgnoreCase(scheme);        final SslContext sslCtx;        if (ssl) {            sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();        } else {            sslCtx = null;        }        EventLoopGroup group = new NioEventLoopGroup();        try {            final WebSocketClientHandler handler = new WebSocketClientHandler(ctx, WebSocketClientHandshakerFactory                    .newHandshaker(uri, WebSocketVersion.V13, null, false, new DefaultHttpHeaders()));            Bootstrap b = new Bootstrap();            b.group(group).channel(NioSocketChannel.class).handler(new ChannelInitializer
     
      () {                @Override                protected void initChannel(SocketChannel ch) {                    ChannelPipeline p = ch.pipeline();                    if (sslCtx != null) {                        p.addLast(sslCtx.newHandler(ch.alloc(), host, port));                    }                    p.addLast(new HttpClientCodec(), new HttpObjectAggregator(8192), handler);                }            });            Channel ch = b.connect(uri.getHost(), port).sync().channel();            handler.handshakeFuture().sync();            /*             * String msg = "222"; WebSocketFrame frame = new             * TextWebSocketFrame(msg); ch.writeAndFlush(frame);             */            // ch.writeAndFlush("222");            BufferedReader console = new BufferedReader(new InputStreamReader(System.in));            while (true) {                String msg = console.readLine();                if (msg == null) {                    break;                } else if ("bye".equals(msg.toLowerCase())) {                    ch.writeAndFlush(new CloseWebSocketFrame());                    ch.closeFuture().sync();                    break;                } else if ("ping".equals(msg.toLowerCase())) {                    WebSocketFrame frame = new PingWebSocketFrame(Unpooled.wrappedBuffer(new byte[] { 8, 1, 8, 1 }));                    ch.writeAndFlush(frame);                } else {                    WebSocketFrame frame = new TextWebSocketFrame(msg);                    ch.writeAndFlush(frame);                }            }        } finally {            group.shutdownGracefully();        }    }}
     

（2）

package test3;import java.time.LocalDateTime;import io.netty.bootstrap.Bootstrap;import io.netty.channel.Channel;import io.netty.channel.ChannelFuture;import io.netty.channel.ChannelFutureListener;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelPromise;import io.netty.channel.SimpleChannelInboundHandler;import io.netty.channel.group.ChannelGroup;import io.netty.channel.group.DefaultChannelGroup;import io.netty.handler.codec.http.FullHttpResponse;import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;import io.netty.handler.codec.http.websocketx.WebSocketFrame;import io.netty.handler.codec.http.websocketx.WebSocketHandshakeException;import io.netty.util.CharsetUtil;import io.netty.util.concurrent.GlobalEventExecutor;import test.SocketHandlerInitializer;public class WebSocketClientHandler extends SimpleChannelInboundHandler

（3）测试用的服务端代码

package com.googosoft.websocket;import java.io.IOException;import javax.websocket.DecodeException;import javax.websocket.OnClose;import javax.websocket.OnError;import javax.websocket.OnMessage;import javax.websocket.OnOpen;import javax.websocket.Session;import javax.websocket.server.ServerEndpoint;@ServerEndpoint("/echo")public class EchoServer {        @OnOpen    public void initSession(Session session) {    }        @OnMessage    public void onMessage(String message, Session session)         throws IOException, InterruptedException {        System.out.println("Received: " + message);        session.getBasicRemote().sendText("This is the first server message");    }        @OnError      public void handleError(Throwable thw) {        thw.printStackTrace();        if (thw instanceof DecodeException) {           System.out.println("Error decoding incoming message: " + ((DecodeException)thw).getText());       } else {           System.out.println("Server WebSocket error: " + thw.getMessage());       }    }        @OnClose    public void processClose(Session session){            }}

在测试的时候，服务端的代码我把它放在了一个web项目里面充当服务端 

客户端就用的普通的Java项目，在main方法里面建立链接，实现通信