HttpListener创建的HTTP服务不能做到实时通信。所以需要WebScket实现与网页的通讯。
首先要在NuGet导入“Fleck”包，需 .NET Framework 4.5及以上。
FleckLog.Level = LogLevel.Debug;
var allSockets = new List<IWebSocketConnection>();
var server = new WebSocketServer("ws://127.0.0.1:50000");
server.Start(socket =>
{
socket.OnOpen = () =>
{
//Console.WriteLine("Open!");
allSockets.Add(socket);
};
socket.OnClose = () =>
{
//Console.WriteLine("Close!");
allSockets.Remove(socket);
};
socket.OnMessage = message =>
{
//Console.WriteLine(message);
allSockets.ToList().ForEach(s => s.Send("Echo: " + message));
};
});
var input = DateTime.Now.ToString();
while (input != "")
{
Thread.Sleep(1000);
foreach (var socket in allSockets.ToList())
{
socket.Send(input);
}
input = DateTime.Now.ToString();
}
2.html网页
<html>
<body>
Welcome<br/>
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<div id="message"></div>
</body>
<script type="text/JavaScript">
var websocket = null;
//判断当前浏览器是否支持WebSocket
if('WebSocket' in window){
websocket = new WebSocket("ws://localhost:50000");
}
else{
alert('Not support websocket');
}
//连接发生错误的回调方法
websocket.onerror = function(){
setMessageInnerHTML("error");
};
//连接成功建立的回调方法
websocket.onopen = function(event){
setMessageInnerHTML("open");
};
//接收到消息的回调方法
websocket.onmessage = function(){
console.log(event,'receive')
setMessageInnerHTML(event.data);
};
//连接关闭的回调方法
websocket.onclose = function(){
setMessageInnerHTML("close");
};
//监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
window.onbeforeunload = function(){
websocket.close();
};
//将消息显示在网页上
function setMessageInnerHTML(innerHTML){
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭连接
function closeWebSocket(){
websocket.close();
}
//发送消息
function send(){
var message = document.getElementById('text').value;
websocket.send(message);
}
</script>
</html>
3.运行程序，打开html网页，网页和服务实现消息的实时通讯，如下图
