C# DotNetty客户端

1. 引入DotNetty包

我用的开发工具是VS2022，不同工具引入可能会有差异

工具——>NuGet包管理器——>管理解决方案的NuGet程序包

搜索DotNetty

2.新建EchoClientHandler.cs类

用于接收服务器返回数据

public class EchoClientHandler : SimpleChannelInboundHandler<IByteBuffer>
{/// <summary>/// Read0是DotNetty特有的对于Read方法的封装/// 封装实现了：/// 1. 返回的message的泛型实现/// 2. 丢弃非该指定泛型的信息/// </summary>/// <param name="ctx"></param>/// <param name="msg"></param>protected override void ChannelRead0(IChannelHandlerContext ctx, IByteBuffer msg){if (msg != null){Console.WriteLine("Receive From Server:" + msg.ToString(Encoding.UTF8));}//ctx.WriteAsync(Unpooled.CopiedBuffer(msg));}public override void ChannelReadComplete(IChannelHandlerContext context){context.Flush();}public override void ChannelActive(IChannelHandlerContext context){Console.WriteLine("==================ChannelActive======================");//context.WriteAndFlushAsync(Unpooled.CopiedBuffer(Encoding.UTF8.GetBytes("Hello World!")));}public override void ChannelInactive(IChannelHandlerContext context){Console.WriteLine("===============ChannelInactive==============");base.ChannelInactive(context);context.CloseAsync();}public override void ExceptionCaught(IChannelHandlerContext context, Exception exception){Console.WriteLine("===============ExceptionCaught==============");Console.WriteLine(exception);context.CloseAsync();}
}

3.新建DotNettyClient.cs客户端类

public class DotNettyClient
{private MultithreadEventLoopGroup group;private Bootstrap bootstrap;private IChannel channel;public async Task StartAsync(){group = new MultithreadEventLoopGroup();try{bootstrap = new Bootstrap().Group(group).Channel<TcpSocketChannel>().Option(ChannelOption.TcpNodelay, true).Handler(new ActionChannelInitializer<ISocketChannel>(channel =>{IChannelPipeline pipeline = channel.Pipeline;pipeline.AddLast(new StringDecoder(Encoding.UTF8));pipeline.AddLast(new StringEncoder(Encoding.UTF8));pipeline.AddLast(new IdleStateHandler(0, 0, 600));pipeline.AddLast(new EchoClientHandler());}));channel = await bootstrap.ConnectAsync("127.0.0.1", 9997);//byte[] bytes = Encoding.UTF8.GetBytes("aaaaa");//await channel.WriteAndFlushAsync(Unpooled.WrappedBuffer(bytes));Console.WriteLine("Connected to server.");// 发送消息给服务器SendMessage("我是客户端");//关闭客户端连接//await channel.CloseAsync();//Console.WriteLine("Client connection closed.");}catch (Exception ex) { Console.WriteLine(ex.ToString());Console.WriteLine(ex.StackTrace);}finally{await group.ShutdownGracefullyAsync();}}public void SendMessage(string message){if (channel != null && channel.Open){Console.WriteLine("666666666666666666666666666");channel.WriteAndFlushAsync(message);Console.WriteLine("Sent message to server: " + message);}}
}

4.使用DotNetty

我这里是窗体应用程序

public partial class Form1 : Form
{public Form1(){InitializeComponent();startClient();}public async Task startClient() {DotNettyClient client = new DotNettyClient();await client.StartAsync();//连接服务//client.SendMessage("111111111111111");}
}