C# Socket服务器及多客户端连接示例
服务端代码[控制台示例]
static List<Socket> Sockets = new List<Socket>();
static void Main(string[] args)
{
int port = 10;
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....");
while (true) //该操作用于多个客户端连接
{
Socket sc = listener.Accept();//接受一个连接
Sockets.Add(sc); //将连接的客户端, 添加到内存当中
Thread t = new Thread(new ThreadStart(() => ReceiveData(sc))); //开启当前Socket线程, 去执行获取数据的动作,与客户端通信
t.IsBackground = true;
t.Start();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
Console.ReadLine();
}
public static void ReceiveData(Socket sc)
{
byte[] buffer = new byte[1024];
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)));while (true)
{
try
{
//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 = "服务端返回信息:" + clientMsg;
sc.Send(PackData(sendMsg));
}
catch (Exception ex)
{
Sockets.Remove(sc); //如果接收的过程中,断开, 那么内存中移除当前Socket对象, 并且退出当前线程
Console.WriteLine("客户端已经断开连接!");
return;
}
}
}
Socket 相关类
/// <summary>
/// 打包握手信息
/// </summary>
/// <param name="secKeyAccept"></param>
/// <returns></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);
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;
}
客户端连接[网页测试]
WebSocket客户端示例
请输入一些文字
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>WebSockets客户端示例</title>
</head>
<script>
var webSocket;
function connect()
{
try
{
var readyState = new Array("正在连接","已建立连接","正在关闭连接","已关闭连接");
var host = "ws://localhost:10";
webSocket = new WebSocket(host);
var message = document.getElementById("message");
message.innerHTML +="<p>Socket状态：" + readyState[webSocket.readyState] + "</p>";
webSocket.onopen = function()
{
message.innerHTML += "<p>Socket状态：" + readyState[webSocket.readyState] + "</p>";
}
webSocket.onmessage = function(msg)
{
message.innerHTML +="<p>接收信息：" + msg.data + "</p>";
}
webSocket.onclose=function()
{
message.innerHTML +="<p>Socket状态：" + readyState[webSocket.readyState] + "</p>";
}
}
catch(exception)
{
message.innerHTML += "<p>有错误发生</p>";
}
}
function send()
{
var text = document.getElementById("text").value;
var message = document.getElementById("message");
if(text == "")
{
message.innerHTML += "<p>请输入一些文字</p>";
return ;
}
try
{
webSocket.send(text);
message.innerHTML += "<p>发送数据：" +text + "</p>";
}
catch(exception)
{
message.innerHTML += "<p>发送数据出错</p>";
}
document.getElementById("text").value="";
}
function disconnect()
{
webSocket.close();
}
</script>
<body>
<h1>WebSocket客户端示例</h1>
<div id="message"></div>
<p>请输入一些文字</p>
<input id="text" type="text">
<button id="connect" onClick="connect();">建立连接</button>
<button id="send" onClick="send();">发送数据</button>
<button id="disconnect" onClick="disconnect();">断开连接</button>
</body>
</html>
