Netty4 websocket 开启服务端并设置IP和端口号

<dependencies>
    <dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty-all</artifactId>
        <version>4.1.87.Final</version>
    </dependency>
</dependencies>

package com.yadinghao.demo.Netty;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
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.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketServerCompressionHandler;
import java.net.InetSocketAddress;
public class WebSocketServer {
    public static void main(String[] args) throws InterruptedException {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .localAddress(new InetSocketAddress("192.168.3.170", 8686))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            pipeline.addLast(new HttpServerCodec()); // HTTP 协议解析，用于握手阶段
                            pipeline.addLast(new HttpObjectAggregator(65536)); // HTTP 协议解析，用于握手阶段
                            pipeline.addLast(new WebSocketServerCompressionHandler()); // WebSocket 数据压缩扩展
                            pipeline.addLast(new WebSocketServerProtocolHandler("/", null, true)); // WebSocket 握手、控制帧处理
                            pipeline.addLast(new MyWebSocketServerHandler());
                        }
                    });
            ChannelFuture f = b.bind().sync();
            f.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }
}

package com.yadinghao.demo.Netty;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
public class MyWebSocketServerHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
        if (frame instanceof TextWebSocketFrame) { // 此处仅处理 Text Frame
            String request = ((TextWebSocketFrame) frame).text();
            ctx.channel().writeAndFlush(new TextWebSocketFrame("收到: " + request));
        }
    }
}