WebSocket，IsWebSocketRequest与AspNetWebSocketContext
asp.net新建一个服务端程序，用来处理链接服务端：1，新建一个处理程序 .ashx
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Web;
using System.Web.WebSockets;
using SFellowEntity.Models;
namespace SchoolfellowCard.Handler
{
/// <summary>
/// WebSocketServer webSocket服务
/// </summary>
public class WebSocketServer : IHttpHandler
{
//用户连接池
private static Dictionary<string, WebSocket> connectPool = new Dictionary<string, WebSocket>();
//离线消息池
private static Dictionary<string, List<MessageInfo>> messagePool = new Dictionary<string, List<MessageInfo>>();
public void ProcessRequest(HttpContext context)
{
if (context.IsWebSocketRequest)
{
context.AcceptWebSocketRequest(ProcessChat);
}
}
/// <summary>
/// webSocket异步作业
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
private async Task ProcessChat(AspNetWebSocketContext context)
{
//WebSocket socket = context.WebSocket;
//while (true)
//{
// if (socket.State == WebSocketState.Open)
// {
// ArraySegment<byte> buffer = new ArraySegment<byte>(new byte);
// WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);
// string userMsg = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);
// userMsg = "你发送了：" + userMsg + "于" + DateTime.Now.ToLongTimeString();
// buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMsg));
// await socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
// }
// else
// {
// break;
// }
//}
WebSocket socket = context.WebSocket;
string user =string.Format("{0}", context.QueryString["user"]);
try
{
#region 验证用户添加连接池
//第一次open时，添加到连接池中
if (!connectPool.ContainsKey(user))
{
connectPool.Add(user, socket); //不存在，添加
}
else
{
if (socket != connectPool) //当前对象不一致，更新
{
connectPool = socket;
}
}
#endregion
#region 离线消息处理
if (messagePool.ContainsKey(user))
{
//TODO：离线消息可放入数据库在此获取离线消息并返回给对应的用户
List<MessageInfo> msgs = messagePool;
foreach (MessageInfo item in msgs)
{
await socket.SendAsync(item.MsgContent, WebSocketMessageType.Text, true, CancellationToken.None);
}
messagePool.Remove(user);//移除离线消息
//TODO:处理完后标记离线消息已推送
}
#endregion
string descUser = string.Empty;//目的用户
while (true)
{
if (socket.State == WebSocketState.Open)
{
ArraySegment<byte> buffer = new ArraySegment<byte>(new byte);
//websocket接收消息
WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);
#region 消息处理（字符截取、消息转发）
try
{
#region 关闭Socket处理，删除连接池
if (socket.State != WebSocketState.Open)//连接关闭
{
if (connectPool.ContainsKey(user)) connectPool.Remove(user);//删除连接池
break;
}
#endregion
string userMsg = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);//发送过来的消息
string[] msgList = userMsg.Split('|');
if (msgList.Length == 2)
{
if (msgList.Trim().Length > 0)
descUser = msgList.Trim();//记录消息目的用户//TODO:将消息接收者可放入数据库存贮记录
buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(msgList));
}
else
buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMsg));
if (connectPool.ContainsKey(descUser))//判断客户端是否在线
{
WebSocket destSocket = connectPool;//目的客户端
if (destSocket != null && destSocket.State == WebSocketState.Open)
await destSocket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
}
else
{
Task.Run(() =>
{
if (!messagePool.ContainsKey(descUser))//将用户添加至离线消息池中
messagePool.Add(descUser, new List<MessageInfo>());
messagePool.Add(new MessageInfo(DateTime.Now, buffer));//添加离线消息
//TODO:离线消息插入数据库
});
}
}
catch (Exception exs)
{
//消息转发异常处理，本次消息忽略 继续监听接下来的消息
}
#endregion
}
else
{
break;
}
}//while end
}
catch (Exception ex)
{
//整体异常处理
if (connectPool.ContainsKey(user)) connectPool.Remove(user);
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
其中，MessageInfo.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SFellowEntity.Models
{
/// <summary>
/// 消息
/// </summary>
public class MessageInfo
{
/// <summary>
/// 消息内容
/// </summary>
public ArraySegment<byte> MsgContent { get; set; }
/// <summary>
/// 消息时间
/// </summary>
public DateTime MsgTime { get; set; }
/// <summary>
/// 构造函数
/// </summary>
/// <param name="msgTime"></param>
/// <param name="msgContent"></param>
public MessageInfo(DateTime msgTime, ArraySegment<byte> msgContent)
{
MsgTime = msgTime;
MsgContent = msgContent;
}
}
}
页面端：
2，页面JavaScript创建WebSocket对象，并发起连接
$('#conn').click(function () {
ws = new WebSocket('ws://' + window.location.hostname + ':' + window.location.port + '/Handler/WebSocketServer.ashx?user=' + $("#user").val());
$('#msg').append('<p>正在连接</p>');
ws.onopen = function () {
$('#msg').append('<p>已经连接</p>');
}
ws.onmessage = function (evt) {
$('#msg').append('<p>' + evt.data + '</p>');
}
ws.onerror = function (evt) {
$('#msg').append('<p>' + JSON.stringify(evt) + '</p>');
}
ws.onclose = function () {
$('#msg').append('<p>已经关闭</p>');
}
});
$('#close').click(function () {
ws.close();
});
$('#send').click(function () {
if (ws.readyState == WebSocket.OPEN) {
ws.send($("#to").val() + "|" + $('#content').val());
}
else {
$('#tips').text('连接已经关闭');
}
});
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