websocket C# server

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客户端

<!DOCTYPE html><html><head>    <title></title>    <script type="text/javascript">        var ws;        function ToggleConnectionClicked() {            try {                var SOCKECT_ADDR = "ws://localhost:1818/chat";                ws = new WebSocket(SOCKECT_ADDR);                ws.onopen = function (event) { alert("已经与服务器建立了连接\r\n当前连接状态：" + this.readyState); };                ws.onmessage = function (event) { alert("接收到服务器发送的数据：\r\n" + event.data); };                ws.onclose = function (event) { alert("已经与服务器断开连接\r\n当前连接状态：" + this.readyState); };                ws.onerror = function (event) {alert("WebSocket异常！" + event.toString());};            } catch (ex) {                alert(ex.message);            }        };        function SendData() {            try {                ws.send("success");            } catch (ex) {                alert(ex.message);            }        };        function seestate() {            alert(ws.readyState);        }           </script></head><body>    <button id='ToggleConnection' type="button" onclick='ToggleConnectionClicked();'>        连接服务器</button><br />    <br />    <button id='ToggleConnection' type="button" onclick='SendData();'>        发送我的名字：beston</button><br />    <br />    <button id='ToggleConnection' type="button" onclick='seestate();'>        查看状态</button><br />    <br /></body></html>

服务端

using System;using System.Text;using System.Net;using System.Net.Sockets;using System.Text.RegularExpressions;using System.Security.Cryptography;namespace WebSocketServer{    class Program    {        static string byte_to_string(byte[] b)        {            string s = "";            foreach(byte _b in b)            {                s += _b.ToString();            }            return s;        }        static void Main(string[] args)        {            int port = 1818;            byte[] buffer = new byte[1024];            IPEndPoint localEP = new IPEndPoint(IPAddress.Any, port);            Socket listener = new Socket(localEP.Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);            try            {                listener.Bind(localEP);                listener.Listen(10);                Console.WriteLine("等待客户端连接....");                Socket sc = listener.Accept();//接受一个连接                Console.WriteLine("接受到了客户端：" + sc.RemoteEndPoint.ToString() + "连接....");                //握手                int length = sc.Receive(buffer);//接受客户端握手信息                sc.Send(PackHandShakeData(GetSecKeyAccetp(buffer, length)));                Console.WriteLine("已经发送握手协议了....");                //接受客户端数据                Console.WriteLine("等待客户端数据....");                length = sc.Receive(buffer);//接受客户端信息                string clientMsg = AnalyticData(buffer, length);                Console.WriteLine("接受到客户端数据：" + clientMsg);                //发送数据                string sendMsg = "您好，" + clientMsg;                Console.WriteLine("发送数据：“" + sendMsg + "” 至客户端....");                sc.Send(PackData(sendMsg));                Console.WriteLine("演示Over!");                Console.Read();            }            catch (Exception e)            {                Console.WriteLine(e.ToString());            }        }        /// <summary>        /// 打包握手信息        /// </summary>        /// <param name="secKeyAccept">Sec-WebSocket-Accept</param>        /// <returns>数据包</returns>        private static byte[] PackHandShakeData(string secKeyAccept)        {            var responseBuilder = new StringBuilder();            responseBuilder.Append("HTTP/1.1 101 Switching Protocols" + Environment.NewLine);            responseBuilder.Append("Upgrade: websocket" + Environment.NewLine);            responseBuilder.Append("Connection: Upgrade" + Environment.NewLine);            responseBuilder.Append("Sec-WebSocket-Accept: " + secKeyAccept + Environment.NewLine + Environment.NewLine);            //如果把上一行换成下面两行，才是thewebsocketprotocol-17协议，但居然握手不成功，目前仍没弄明白！            //responseBuilder.Append("Sec-WebSocket-Accept: " + secKeyAccept + Environment.NewLine);            //responseBuilder.Append("Sec-WebSocket-Protocol: chat" + Environment.NewLine);            return Encoding.UTF8.GetBytes(responseBuilder.ToString());        }        /// <summary>        /// 生成Sec-WebSocket-Accept        /// </summary>        /// <param name="handShakeText">客户端握手信息</param>        /// <returns>Sec-WebSocket-Accept</returns>        private static string GetSecKeyAccetp(byte[] handShakeBytes, int bytesLength)        {            string handShakeText = Encoding.UTF8.GetString(handShakeBytes, 0, bytesLength);            string key = string.Empty;            Regex r = new Regex(@"Sec\-WebSocket\-Key:(.*?)\r\n");            Match m = r.Match(handShakeText);            if (m.Groups.Count != 0)            {                key = Regex.Replace(m.Value, @"Sec\-WebSocket\-Key:(.*?)\r\n", "$1").Trim();            }            byte[] encryptionString = SHA1.Create().ComputeHash(Encoding.ASCII.GetBytes(key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"));            return Convert.ToBase64String(encryptionString);        }        /// <summary>        /// 解析客户端数据包        /// </summary>        /// <param name="recBytes">服务器接收的数据包</param>        /// <param name="recByteLength">有效数据长度</param>        /// <returns></returns>        private static string AnalyticData(byte[] recBytes, int recByteLength)        {            if (recByteLength < 2) { return string.Empty; }            bool fin = (recBytes[0] & 0x80) == 0x80; // 1bit，1表示最后一帧              if (!fin)            {                return string.Empty;// 超过一帧暂不处理             }            bool mask_flag = (recBytes[1] & 0x80) == 0x80; // 是否包含掩码              if (!mask_flag)            {                return string.Empty;// 不包含掩码的暂不处理            }            int payload_len = recBytes[1] & 0x7F; // 数据长度              byte[] masks = new byte[4];            byte[] payload_data;            if (payload_len == 126)            {                Array.Copy(recBytes, 4, masks, 0, 4);                payload_len = (UInt16)(recBytes[2] << 8 | recBytes[3]);                payload_data = new byte[payload_len];                Array.Copy(recBytes, 8, payload_data, 0, payload_len);            }            else if (payload_len == 127)            {                Array.Copy(recBytes, 10, masks, 0, 4);                byte[] uInt64Bytes = new byte[8];                for (int i = 0; i < 8; i++)                {                    uInt64Bytes[i] = recBytes[9 - i];                }                UInt64 len = BitConverter.ToUInt64(uInt64Bytes, 0);                payload_data = new byte[len];                for (UInt64 i = 0; i < len; i++)                {                    payload_data[i] = recBytes[i + 14];                }            }            else            {                Array.Copy(recBytes, 2, masks, 0, 4);                payload_data = new byte[payload_len];                Array.Copy(recBytes, 6, payload_data, 0, payload_len);            }            for (var i = 0; i < payload_len; i++)            {                payload_data[i] = (byte)(payload_data[i] ^ masks[i % 4]);            }            return Encoding.UTF8.GetString(payload_data);        }        /// <summary>        /// 打包服务器数据        /// </summary>        /// <param name="message">数据</param>        /// <returns>数据包</returns>        private static byte[] PackData(string message)        {            byte[] contentBytes = null;            byte[] temp = Encoding.UTF8.GetBytes(message);            if (temp.Length < 126)            {                contentBytes = new byte[temp.Length + 2];                contentBytes[0] = 0x81;                contentBytes[1] = (byte)temp.Length;                Array.Copy(temp, 0, contentBytes, 2, temp.Length);            }            else if (temp.Length < 0xFFFF)            {                contentBytes = new byte[temp.Length + 4];                contentBytes[0] = 0x81;                contentBytes[1] = 126;                contentBytes[2] = (byte)(temp.Length & 0xFF);                contentBytes[3] = (byte)(temp.Length >> 8 & 0xFF);                Array.Copy(temp, 0, contentBytes, 4, temp.Length);            }            else            {                // 暂不处理超长内容              }            return contentBytes;        }    }}

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