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添加Maven依赖：

        <dependency>            <groupId>io.netty</groupId>            <artifactId>netty-all</artifactId>            <version>4.1.36.Final</version>        </dependency>

示例代码：

import io.netty.bootstrap.Bootstrap;import io.netty.channel.*;import io.netty.channel.nio.NioEventLoopGroup;import io.netty.channel.socket.nio.NioSocketChannel;public class NettyClient{    public static void main(String[] args)throws Exception    {        Bootstrap bootStrap = new Bootstrap();        NioEventLoopGroup workerGroup = new NioEventLoopGroup();        bootStrap.group(workerGroup)                .channel(NioSocketChannel.class)                .remoteAddress("127.0.0.1",8080)                .handler(new ChannelInitializer<Channel>()                {                    @Override                    protected void initChannel(Channel channel) throws Exception                    {                        channel.pipeline().addLast(new ClientHandler());                    }                });        ChannelFuture future = bootStrap.connect();        if (future.channel().isActive()){            future.channel().writeAndFlush("hello world");        }    }    static class ClientHandler extends ChannelInboundHandlerAdapter{        @Override        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception        {            System.out.println("read msg : "+msg);            ctx.writeAndFlush("Hello World");            super.channelRead(ctx, msg);        }    }}