NetCore WebSocket即时通讯示例

NetCore WebSocket 即时通讯示例，供大家参考，具体内容如下

1.新建Netcore Web项目

2.创建简易通讯协议

public class MsgTemplate
 {
 public string SenderID { get; set; }
 public string ReceiverID { get; set; }
 public string MessageType { get; set; }
 public string Content { get; set; }
 }

SenderID发送者ID

ReceiverID 接受者ID

MessageType 消息类型  Text  Voice 等等

Content 消息内容

3.添加中间件ChatWebSocketMiddleware

public class ChatWebSocketMiddleware
 {
 private static ConcurrentDictionary _sockets = new ConcurrentDictionary();

 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(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(buffer);
 return socket.SendAsync(segment, WebSocketMessageType.Text, true, ct);
 }

 private static async Task ReceiveStringAsync(System.Net.WebSockets.WebSocket socket, CancellationToken ct = default(CancellationToken))
 {
 var buffer = new ArraySegment(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

if (socket.Key == msg.ReceiverID || socket.Key == socketId)
{
 await SendStringAsync(socket.Value,JsonConvert.SerializeObject(msg), ct);
}

4.在Startup.cs中使用中间件

app.UseWebSockets();
app.UseMiddleware();

5.建立移动端测试示例 这里采用Ionic3运行在web端

创建ionic3项目略过 新手可点这里查看  或者有Angular2/4项目竟然可直接往下看

(1) 启动Ionic项目

当初创建ionic3项目时候遇到不少问题

比如ionic-cli初始化项目失败 切换到默认npmorg源就好了

比如ionic serve失败 打开代理允许FQ就好了

启动后界面是这样式的

(2) 创建聊天窗口dialog 具体布局实现 模块加载略过直接进入websocket实现

在这之前别忘了启动web项目 否则会出现这样情况 链接不到服务

(3)dialog.ts具体实现

export class Dialog {

 private ws: any;
 private msgArr: Array;

 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为我要发送的内容 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 这是websocke服务链接地址
sid表示着我这个端的WebSocke唯一标识  找到这个key就可以找到我这个用户端了 

6.在web端也实现一个会话窗口

基本开发完成 接下来看看效果

7.web和webapp端对话

8.webapp发送 web接收

9.目前就实现了这么多  因为项目还涉及其它技术 暂时不开放源码了

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。