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<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
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<ChatWebSocketMiddleware>();
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<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
<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>
<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脚本之家。
