NetCore WebSocket 即時通訊示例，供大家參考，具體內容如下
1.新建Netcore Web項目
2.創建簡易通訊協議
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public class MsgTemplate { public string SenderID { get; set; } public string ReceiverID { get; set; } public string MessageType { get; set; } public string Content { get; set; } } |
SenderID發送者ID
ReceiverID 接受者ID
MessageType 消息類型 Text Voice 等等
Content 消息內容
3.添加中間件ChatWebSocketMiddleware
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public class ChatWebSocketMiddleware { private static ConcurrentDictionary<string, System.Net.WebSockets.WebSocket> _sockets = new ConcurrentDictionary<string, System.Net.WebSockets.WebSocket>(); private readonly RequestDelegate _next; public ChatWebSocketMiddleware(RequestDelegate next) { _next = next; } public async Task Invoke(HttpContext context) { if (!context.WebSockets.IsWebSocketRequest) { await _next.Invoke(context); return; } System.Net.WebSockets.WebSocket dummy; CancellationToken ct = context.RequestAborted; var currentSocket = await context.WebSockets.AcceptWebSocketAsync(); //string socketId = Guid.NewGuid().ToString(); string socketId = context.Request.Query["sid"].ToString(); if (!_sockets.ContainsKey(socketId)) { _sockets.TryAdd(socketId, currentSocket); } //_sockets.TryRemove(socketId, out dummy); //_sockets.TryAdd(socketId, currentSocket); while (true) { if (ct.IsCancellationRequested) { break; } string response = await ReceiveStringAsync(currentSocket, ct); MsgTemplate msg = JsonConvert.DeserializeObject<MsgTemplate>(response); if (string.IsNullOrEmpty(response)) { if (currentSocket.State != WebSocketState.Open) { break; } continue; } foreach (var socket in _sockets) { if (socket.Value.State != WebSocketState.Open) { continue; } if (socket.Key == msg.ReceiverID || socket.Key == socketId) { await SendStringAsync(socket.Value, JsonConvert.SerializeObject(msg), ct); } } } //_sockets.TryRemove(socketId, out dummy); await currentSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "Closing", ct); currentSocket.Dispose(); } private static Task SendStringAsync(System.Net.WebSockets.WebSocket socket, string data, CancellationToken ct = default(CancellationToken)) { var buffer = Encoding.UTF8.GetBytes(data); var segment = new ArraySegment<byte>(buffer); return socket.SendAsync(segment, WebSocketMessageType.Text, true, ct); } private static async Task<string> ReceiveStringAsync(System.Net.WebSockets.WebSocket socket, CancellationToken ct = default(CancellationToken)) { var buffer = new ArraySegment<byte>(new byte[8192]); using (var ms = new MemoryStream()) { WebSocketReceiveResult result; do { ct.ThrowIfCancellationRequested(); result = await socket.ReceiveAsync(buffer, ct); ms.Write(buffer.Array, buffer.Offset, result.Count); } while (!result.EndOfMessage); ms.Seek(0, SeekOrigin.Begin); if (result.MessageType != WebSocketMessageType.Text) { return null; } using (var reader = new StreamReader(ms, Encoding.UTF8)) { return await reader.ReadToEndAsync(); } } } } |
控制只有接收者才能收到消息
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if (socket.Key == msg.ReceiverID || socket.Key == socketId){ await SendStringAsync(socket.Value,JsonConvert.SerializeObject(msg), ct);} |
4.在Startup.cs中使用中間件
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app.UseWebSockets();app.UseMiddleware<ChatWebSocketMiddleware>(); |
5.建立移動端測試示例 這里采用Ionic3運行在web端
創建ionic3項目略過 新手可點這里查看 或者有Angular2/4項目竟然可直接往下看
(1) 啟動Ionic項目
當初創建ionic3項目時候遇到不少問題
比如ionic-cli初始化項目失敗 切換到默認npmorg源就好了
比如ionic serve失敗 打開代理允許FQ就好了
啟動后界面是這樣式的
(2) 創建聊天窗口dialog 具體布局實現 模塊加載略過直接進入websocket實現
在這之前別忘了啟動web項目 否則會出現這樣情況 鏈接不到服務
(3)dialog.ts具體實現
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export class Dialog { private ws: any; private msgArr: Array<any>; constructor(private httpService: HttpService) { this.msgArr = []; } ionViewDidEnter() { if (!this.ws) { this.ws = new WebSocket("ws://localhost:56892?sid=222"); this.ws.onopen = () => { console.log('open'); }; this.ws.onmessage = (event) => { console.log('new message: ' + event.data); var msgObj = JSON.parse(event.data); this.msgArr.push(msgObj);; }; this.ws.onerror = () => { console.log('error occurred!'); }; this.ws.onclose = (event) => { console.log('close code=' + event.code); }; } } sendMsg(msg) {//msg為我要發送的內容 比如"hello world" var msgObj = { SenderID: "222", ReceiverID: "111", MessageType: "text", Content: msg }; this.ws.send(JSON.stringify(msgObj)); } |
ws://localhost:56892?sid=222 這是websocke服務鏈接地址
sid表示著我這個端的WebSocke唯一標識 找到這個key就可以找到我這個用戶端了
6.在web端也實現一個會話窗口
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<div class="container" style="width:90%;margin:0px auto;border:1px solid steelblue;"> <div class="msg"> <div id="msgs" style="height:200px;"></div> </div> <div style="display:block;width:100%"> <input type="text" style="max-width:unset;width:100%;max-width:100%" id="MessageField" placeholder="type message and press enter" /> </div></div> |
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<script> $(function () { $('.navbar-default').addClass('on'); var userName = '@Model'; var protocol = location.protocol === "https:" ? "wss:" : "ws:"; var wsUri = protocol + "//" + window.location.host + "?sid=111"; var socket = new WebSocket(wsUri); socket.onopen = e => { console.log("socket opened", e); }; socket.onclose = function (e) { console.log("socket closed", e); }; socket.onmessage = function (e) { console.log(e); var msgObj = JSON.parse(e.data); $('#msgs').append(msgObj.Content + '<br />'); }; socket.onerror = function (e) { console.error(e.data); }; $('#MessageField').keypress(function (e) { if (e.which != 13) { return; } e.preventDefault(); var message = $('#MessageField').val(); var msgObj = { SenderID:"111", ReceiverID:"222", MessageType: "text", Content: message }; socket.send(JSON.stringify(msgObj)); $('#MessageField').val(''); }); }); </script> |
基本開發完成 接下來看看效果
7.web和webapp端對話
8.webapp發送 web接收
9.目前就實現了這么多 因為項目還涉及其它技術 暫時不開放源碼了
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
