HTML 5 WebSocket实现实时视频文字传输(2)
2014-02-20 19:31
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客户端
在支持WebSocket的浏览器中,可以直接在Javascript中通过WebSocket对象来实现通信。WebSocket对象主要通过onopen,onmessage,onclose即onerror四个事件实现对socket消息的异步响应。
请创建静态页面 不用创建ruant=“server”的 否则会自动reload
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
var wsServer = 'ws://localhost:9999/webSocket.ashx'; //基于.NET4.5服务器地址
//var wsServer = 'ws://localhost:1818'; //基于.NET服务器地址
var websocket = new WebSocket(wsServer); //创建WebSocket对象
//websocket.send("hello");//向服务器发送消息
//alert(websocket.readyState);//查看websocket当前状态
websocket.onopen = function (evt) {
//已经建立连接
alert("已经建立连接");
};
websocket.onclose = function (evt) {
//已经关闭连接
alert("已经关闭连接");
};
websocket.onmessage = function (evt) {
//收到服务器消息,使用evt.data提取
evt.stopPropagation()
evt.preventDefault()
//alert(evt.data);
writeToScreen(evt.data);
//websocket.close();
};
websocket.onerror = function (evt) {
//产生异常
//alert(evt.message);
writeToScreen(evt.message);
};
function sendMsg() {
if (websocket.readyState == websocket.OPEN) {
msg = document.getElementById("msg").value;
websocket.send(msg);
writeToScreen("发送成功!");
} else {
writeToScreen("连接失败!");
}
}
function writeToScreen(message) {
var pre = document.createElement("p");
pre.style.wordWrap = "break-word";
pre.innerHTML += message;
output.appendChild(pre);
}
</script>
</head>
<body>
<div>
<input type="text" id="msg" value="beyond is number one!" />
<button onclick="sendMsg()">send</button>
</div>
<div id="output"></div>
</body>
</html>
readyState表示连接有四种状态:
CONNECTING (0):表示还没建立连接;
OPEN (1): 已经建立连接,可以进行通讯;
CLOSING (2):通过关闭握手,正在关闭连接;
CLOSED (3):连接已经关闭或无法打开;
url是代表 WebSocket 服务器的网络地址,协议通常是”ws”或“wss(加密通信)”,send 方法就是发送数据到服务器端;
close 方法就是关闭连接;
onopen连接建立,即握手成功触发的事件;
onmessage收到服务器消息时触发的事件;
onerror异常触发的事件;
onclose关闭连接触发的事件;
先说说基于.NET4.5的吧 ashx里面应该是这样写的
//得到当前WebSocket请求
HttpContext.Current.AcceptWebSocketRequest(async (context) =>
{
WebSocket socket = context.WebSocket;//Socket
while (true)
{
ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[1024]);
CancellationToken token;
WebSocketReceiveResult result =
await socket.ReceiveAsync(buffer, token);
if (socket.State == WebSocketState.Open)
{
string userMessage = Encoding.UTF8.GetString(buffer.Array, 0,
result.Count);
userMessage = "You sent: " + userMessage + " at " +
DateTime.Now.ToLongTimeString();
buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMessage));
await socket.SendAsync(buffer, WebSocketMessageType.Text,
true, CancellationToken.None);
}
else { break; }
}
});
然后需要注意的是 部署到IIS8上面 转到 Windows程序和功能 -打开Windows功能里面 IIS选项启动4.5 和WebSocket支持 否则会报错误的。
如果你不是Windows8 或者IIS的问题 你可以使用其他方式实现websocket服务器 比如.net socket模拟(因为websocket本身就是基于TCP的完全可以模拟只是规则特别..)
网上有人写了下面一段
class Program
{
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!");
}
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;
}
}
或者参考这里
ok! 基本上能实现传输文字了,接下来是图像 可以通过base64编码的方式传输 也可以通过二进制传输
在支持WebSocket的浏览器中,可以直接在Javascript中通过WebSocket对象来实现通信。WebSocket对象主要通过onopen,onmessage,onclose即onerror四个事件实现对socket消息的异步响应。
请创建静态页面 不用创建ruant=“server”的 否则会自动reload
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
var wsServer = 'ws://localhost:9999/webSocket.ashx'; //基于.NET4.5服务器地址
//var wsServer = 'ws://localhost:1818'; //基于.NET服务器地址
var websocket = new WebSocket(wsServer); //创建WebSocket对象
//websocket.send("hello");//向服务器发送消息
//alert(websocket.readyState);//查看websocket当前状态
websocket.onopen = function (evt) {
//已经建立连接
alert("已经建立连接");
};
websocket.onclose = function (evt) {
//已经关闭连接
alert("已经关闭连接");
};
websocket.onmessage = function (evt) {
//收到服务器消息,使用evt.data提取
evt.stopPropagation()
evt.preventDefault()
//alert(evt.data);
writeToScreen(evt.data);
//websocket.close();
};
websocket.onerror = function (evt) {
//产生异常
//alert(evt.message);
writeToScreen(evt.message);
};
function sendMsg() {
if (websocket.readyState == websocket.OPEN) {
msg = document.getElementById("msg").value;
websocket.send(msg);
writeToScreen("发送成功!");
} else {
writeToScreen("连接失败!");
}
}
function writeToScreen(message) {
var pre = document.createElement("p");
pre.style.wordWrap = "break-word";
pre.innerHTML += message;
output.appendChild(pre);
}
</script>
</head>
<body>
<div>
<input type="text" id="msg" value="beyond is number one!" />
<button onclick="sendMsg()">send</button>
</div>
<div id="output"></div>
</body>
</html>
readyState表示连接有四种状态:
CONNECTING (0):表示还没建立连接;
OPEN (1): 已经建立连接,可以进行通讯;
CLOSING (2):通过关闭握手,正在关闭连接;
CLOSED (3):连接已经关闭或无法打开;
url是代表 WebSocket 服务器的网络地址,协议通常是”ws”或“wss(加密通信)”,send 方法就是发送数据到服务器端;
close 方法就是关闭连接;
onopen连接建立,即握手成功触发的事件;
onmessage收到服务器消息时触发的事件;
onerror异常触发的事件;
onclose关闭连接触发的事件;
先说说基于.NET4.5的吧 ashx里面应该是这样写的
//得到当前WebSocket请求
HttpContext.Current.AcceptWebSocketRequest(async (context) =>
{
WebSocket socket = context.WebSocket;//Socket
while (true)
{
ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[1024]);
CancellationToken token;
WebSocketReceiveResult result =
await socket.ReceiveAsync(buffer, token);
if (socket.State == WebSocketState.Open)
{
string userMessage = Encoding.UTF8.GetString(buffer.Array, 0,
result.Count);
userMessage = "You sent: " + userMessage + " at " +
DateTime.Now.ToLongTimeString();
buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMessage));
await socket.SendAsync(buffer, WebSocketMessageType.Text,
true, CancellationToken.None);
}
else { break; }
}
});
然后需要注意的是 部署到IIS8上面 转到 Windows程序和功能 -打开Windows功能里面 IIS选项启动4.5 和WebSocket支持 否则会报错误的。
如果你不是Windows8 或者IIS的问题 你可以使用其他方式实现websocket服务器 比如.net socket模拟(因为websocket本身就是基于TCP的完全可以模拟只是规则特别..)
网上有人写了下面一段
class Program
{
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!");
}
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;
}
}
或者参考这里
ok! 基本上能实现传输文字了,接下来是图像 可以通过base64编码的方式传输 也可以通过二进制传输
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