用IHttpAsyncHandler实现Comet
2010-05-27 00:36 Kevin-wang 阅读(4224) 评论(7) 编辑 收藏 举报实现功能：登录、获取用户列表、退出；JS库采用jQuery1.32
解决方案
运行时的效果图：
输入帐号后，点击“Login”按钮后显示当前在线的用户列表，点击“Logout”按钮后当前用户退出后向其它在线用户推送新的在线用户列表；
Default.aspx页面引用的两个js脚本，jQuery1.3.2,WebIM.js;
<script src="Scripts/jquery-1.3.2.min.js" type="text/javascript"></script>
<script src="Scripts/WebIM.js" type="text/javascript"></script>
<script src="Scripts/WebIM.js" type="text/javascript"></script>
HTML DOM代码如下：
<asp:Label ID="Label1" runat="server" Text="帐号"></asp:Label>
<input id="txtLoginID" type="" /><input id="btnLogin" type="button" value="Login" /><input
id="btnLogout" type="button" value="Logout" />
<br />
<div id="divUserList">
</div>
<br />
广播内容:
<input type="text" id="content" /><br />
消息记录：
<div id="divResult">
</div>
<input type="button" id="btnSend" value="广播" />
<input id="txtLoginID" type="" /><input id="btnLogin" type="button" value="Login" /><input
id="btnLogout" type="button" value="Logout" />
<br />
<div id="divUserList">
</div>
<br />
广播内容:
<input type="text" id="content" /><br />
消息记录：
<div id="divResult">
</div>
<input type="button" id="btnSend" value="广播" />
WebIM.js脚本
/// <reference path="jquery-1.3.2.min.js" >
$(document).ready(function() {
//状态，代表是否登录
var _logined = false;
//登录，登录成功后，获取在线用户列表，
function login() {
$.post("comet_broadcast.asyn", { action: 'login', uid: $("#txtLoginID").val() },
function(data, status) {
if (data == "OK") {
_logined = true;
getuserlist();
}
});
}
//获取在线用户列表，获取列表后，进入消息等待
function getuserlist() {
$.post("comet_broadcast.asyn", { action: 'getuserlist', uid: $("#txtLoginID").val() },
function(data, status) {
//alert('getuserlist' + data);
var result = $("#divResult");
result.html(result.html() + "<br/>" +"用户列表：" +data);
wait();
});
}
//退出
function logout() {
$.post("comet_broadcast.asyn", { action: 'logout', uid: $("#txtLoginID").val() },
function(data, status) { _logined = false; alert(data); }
);
}
//消息等待，接收到消息后显示，发起下一次的消息等待
function wait() {
$.post("comet_broadcast.asyn", { action: 'connect', uid: $("#txtLoginID").val() },
function(data, status) {
// alert('wait' + data);
var result = $("#divResult");
result.html(result.html() + "<br/>" +"用户列表:"+ data);
//服务器返回消息,再次立连接
if (_logined) {
wait();
}
}, "html"
);
}
//附加事件
$("#btnLogin").click(function() { if ($("#txtLoginID").val() == '') alert('空'); login(); });
$("#btnLogout").click(function() { logout(); });
});
$(document).ready(function() {
//状态，代表是否登录
var _logined = false;
//登录，登录成功后，获取在线用户列表，
function login() {
$.post("comet_broadcast.asyn", { action: 'login', uid: $("#txtLoginID").val() },
function(data, status) {
if (data == "OK") {
_logined = true;
getuserlist();
}
});
}
//获取在线用户列表，获取列表后，进入消息等待
function getuserlist() {
$.post("comet_broadcast.asyn", { action: 'getuserlist', uid: $("#txtLoginID").val() },
function(data, status) {
//alert('getuserlist' + data);
var result = $("#divResult");
result.html(result.html() + "<br/>" +"用户列表：" +data);
wait();
});
}
//退出
function logout() {
$.post("comet_broadcast.asyn", { action: 'logout', uid: $("#txtLoginID").val() },
function(data, status) { _logined = false; alert(data); }
);
}
//消息等待，接收到消息后显示，发起下一次的消息等待
function wait() {
$.post("comet_broadcast.asyn", { action: 'connect', uid: $("#txtLoginID").val() },
function(data, status) {
// alert('wait' + data);
var result = $("#divResult");
result.html(result.html() + "<br/>" +"用户列表:"+ data);
//服务器返回消息,再次立连接
if (_logined) {
wait();
}
}, "html"
);
}
//附加事件
$("#btnLogin").click(function() { if ($("#txtLoginID").val() == '') alert('空'); login(); });
$("#btnLogout").click(function() { logout(); });
});
public class WebIMAsyncHandler : IHttpAsyncHandler
{
#region IHttpAsyncHandler 成员
public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
{
string _UID = context.Request.Params["uid"];
WebIMClientAsyncResult _AsyncResult = new WebIMClientAsyncResult(context, cb, extraData);
string _Content = context.Request.Params["content"];
string _Action = context.Request.Params["action"];
if (_Action == "login")
{
_UID = context.Request.Params["uid"];
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().Login(_UID, _AsyncResult);
}
else if (_Action == "logout")
{
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().Logout(_UID, _AsyncResult);
}
else if (_Action == "connect")
{
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().Connect(_AsyncResult);
}
else if (_Action == "getuserlist")
{
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().GetUserList(_AsyncResult);
}
//调用
WebIMMessageHandler.Instance().AddMessage(_Content, _AsyncResult);
return _AsyncResult;
}
public void EndProcessRequest(IAsyncResult result)
{
}
#endregion
#region IHttpHandler 成员
public bool IsReusable
{
get { return false; ; }
}
public void ProcessRequest(HttpContext context)
{
throw new NotImplementedException();
}
#endregion
}
public class WebIMClientAsyncResult : IAsyncResult
{
bool m_IsCompleted = false;
private HttpContext m_Context;
private AsyncCallback m_Callback;
private object m_ExtraData;
private string m_Content;
private string m_LoginID = string.Empty;
public WebIMClientAsyncResult(HttpContext p_Context, AsyncCallback p_Callback, object p_ExtraData)
{
this.m_Context = p_Context;
this.m_Callback = p_Callback;
this.m_ExtraData = p_ExtraData;
}
/// <summary>
/// 用户编号
/// </summary>
public string LoginID
{
get
{
return m_LoginID;
}
set
{
m_LoginID = value;
}
}
/// <summary>
/// 发送消息的内容，暂时未使用到
/// </summary>
public string Content
{
get
{
return m_Content;
}
set
{
m_Content = value;
}
}
#region IAsyncResult 成员
public object AsyncState
{
get { return null; }
}
public WaitHandle AsyncWaitHandle
{
get { return null; }
}
public bool CompletedSynchronously
{
get { return false; }
}
public bool IsCompleted
{
get { return m_IsCompleted; }
}
#endregion
/// <summary>
/// 向客户端响应消息
/// </summary>
/// <param name="data"></param>
public void Send(object data)
{
try
{
m_Context.Response.Write(this.Content);
if (m_Callback != null)
{
m_Callback(this);
}
}
catch { }
finally
{
m_IsCompleted = true;
}
}
}
public class WebIMMessageHandler
{
private static readonly WebIMMessageHandler m_Instance = new WebIMMessageHandler();
//记录所有请求的客户端
List<WebIMClientAsyncResult> m_Clients = new List<WebIMClientAsyncResult>();
string m_Users = string.Empty;
public WebIMMessageHandler()
{
}
public static WebIMMessageHandler Instance()
{
return m_Instance;
}
/// <summary>
/// 登录
/// </summary>
/// <param name="p_LoginID"></param>
/// <param name="p_ClientAsyncResult"></param>
public void Login(string p_LoginID, WebIMClientAsyncResult p_ClientAsyncResult)
{
bool _Logined = false;
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
if (_Item.LoginID == p_LoginID)
{
p_ClientAsyncResult.Content = "你已登录";
_Logined = true;
break;
}
}
if (!_Logined)
{
//m_Clients.Add(p_ClientAsyncResult);
p_ClientAsyncResult.Content = "OK";
}
p_ClientAsyncResult.Send(null);
}
private string GetUsers()
{
string _Users = string.Empty;
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
_Users += _Item.LoginID + ",";
}
return _Users;
}
public void Logout(string p_LoginID, WebIMClientAsyncResult p_ClientAsyncResult)
{
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
if (_Item.LoginID == p_LoginID)
{
m_Clients.Remove(_Item);
break;
}
}
p_ClientAsyncResult.Content = "退出成功";
p_ClientAsyncResult.Send(null);
//UpdateUserList();
string _Users = GetUsers();
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
_Item.Content = _Users;
_Item.Send(null);
}
m_Clients.Clear();
}
public void GetUserList(WebIMClientAsyncResult p_ClientAsyncResult)
{
Connect(p_ClientAsyncResult);
string _Users = GetUsers();
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
_Item.Content = _Users;
_Item.Send(null);
}
m_Clients.Clear();
}
public void Connect(WebIMClientAsyncResult p_Client)
{
bool _Exists = false;
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
if (_Item.LoginID == p_Client.LoginID)
{
_Exists = true;
break;
}
}
if (!_Exists)
{
m_Clients.Add(p_Client);
}
}
public void UpdateUserList()
{
string _Users = GetUsers();
foreach (WebIMClientAsyncResult result in m_Clients)
{
result.Content = m_Users;
result.Send(null);
}
m_Clients.Clear();
}
/// <summary>
/// 广播消息
/// </summary>
/// <param name="p_Message"></param>
/// <param name="p_AsyncResult"></param>
public void AddMessage(string p_Message, WebIMClientAsyncResult p_ClientAsyncResult)
{
////保持联连
//if (p_Message == "-1")
//{
// m_Clients.Add(p_ClientAsyncResult);
//}
//else
//{
// //将当前请求的内容输出到客户端
// p_ClientAsyncResult.Content = p_Message;
// p_ClientAsyncResult.Send(null);
// //否则将遍历所有已缓存的client,并将当前内容输出到客户端
// foreach (WebIMClientAsyncResult result in m_Clients)
// {
// result.Content = p_Message;
// result.Send(null);
// }
// //清空所有缓存
// m_Clients.Clear();
//}
}
}
{
#region IHttpAsyncHandler 成员
public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData)
{
string _UID = context.Request.Params["uid"];
WebIMClientAsyncResult _AsyncResult = new WebIMClientAsyncResult(context, cb, extraData);
string _Content = context.Request.Params["content"];
string _Action = context.Request.Params["action"];
if (_Action == "login")
{
_UID = context.Request.Params["uid"];
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().Login(_UID, _AsyncResult);
}
else if (_Action == "logout")
{
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().Logout(_UID, _AsyncResult);
}
else if (_Action == "connect")
{
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().Connect(_AsyncResult);
}
else if (_Action == "getuserlist")
{
_AsyncResult.LoginID = _UID;
WebIMMessageHandler.Instance().GetUserList(_AsyncResult);
}
//调用
WebIMMessageHandler.Instance().AddMessage(_Content, _AsyncResult);
return _AsyncResult;
}
public void EndProcessRequest(IAsyncResult result)
{
}
#endregion
#region IHttpHandler 成员
public bool IsReusable
{
get { return false; ; }
}
public void ProcessRequest(HttpContext context)
{
throw new NotImplementedException();
}
#endregion
}
public class WebIMClientAsyncResult : IAsyncResult
{
bool m_IsCompleted = false;
private HttpContext m_Context;
private AsyncCallback m_Callback;
private object m_ExtraData;
private string m_Content;
private string m_LoginID = string.Empty;
public WebIMClientAsyncResult(HttpContext p_Context, AsyncCallback p_Callback, object p_ExtraData)
{
this.m_Context = p_Context;
this.m_Callback = p_Callback;
this.m_ExtraData = p_ExtraData;
}
/// <summary>
/// 用户编号
/// </summary>
public string LoginID
{
get
{
return m_LoginID;
}
set
{
m_LoginID = value;
}
}
/// <summary>
/// 发送消息的内容，暂时未使用到
/// </summary>
public string Content
{
get
{
return m_Content;
}
set
{
m_Content = value;
}
}
#region IAsyncResult 成员
public object AsyncState
{
get { return null; }
}
public WaitHandle AsyncWaitHandle
{
get { return null; }
}
public bool CompletedSynchronously
{
get { return false; }
}
public bool IsCompleted
{
get { return m_IsCompleted; }
}
#endregion
/// <summary>
/// 向客户端响应消息
/// </summary>
/// <param name="data"></param>
public void Send(object data)
{
try
{
m_Context.Response.Write(this.Content);
if (m_Callback != null)
{
m_Callback(this);
}
}
catch { }
finally
{
m_IsCompleted = true;
}
}
}
public class WebIMMessageHandler
{
private static readonly WebIMMessageHandler m_Instance = new WebIMMessageHandler();
//记录所有请求的客户端
List<WebIMClientAsyncResult> m_Clients = new List<WebIMClientAsyncResult>();
string m_Users = string.Empty;
public WebIMMessageHandler()
{
}
public static WebIMMessageHandler Instance()
{
return m_Instance;
}
/// <summary>
/// 登录
/// </summary>
/// <param name="p_LoginID"></param>
/// <param name="p_ClientAsyncResult"></param>
public void Login(string p_LoginID, WebIMClientAsyncResult p_ClientAsyncResult)
{
bool _Logined = false;
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
if (_Item.LoginID == p_LoginID)
{
p_ClientAsyncResult.Content = "你已登录";
_Logined = true;
break;
}
}
if (!_Logined)
{
//m_Clients.Add(p_ClientAsyncResult);
p_ClientAsyncResult.Content = "OK";
}
p_ClientAsyncResult.Send(null);
}
private string GetUsers()
{
string _Users = string.Empty;
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
_Users += _Item.LoginID + ",";
}
return _Users;
}
public void Logout(string p_LoginID, WebIMClientAsyncResult p_ClientAsyncResult)
{
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
if (_Item.LoginID == p_LoginID)
{
m_Clients.Remove(_Item);
break;
}
}
p_ClientAsyncResult.Content = "退出成功";
p_ClientAsyncResult.Send(null);
//UpdateUserList();
string _Users = GetUsers();
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
_Item.Content = _Users;
_Item.Send(null);
}
m_Clients.Clear();
}
public void GetUserList(WebIMClientAsyncResult p_ClientAsyncResult)
{
Connect(p_ClientAsyncResult);
string _Users = GetUsers();
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
_Item.Content = _Users;
_Item.Send(null);
}
m_Clients.Clear();
}
public void Connect(WebIMClientAsyncResult p_Client)
{
bool _Exists = false;
foreach (WebIMClientAsyncResult _Item in m_Clients)
{
if (_Item.LoginID == p_Client.LoginID)
{
_Exists = true;
break;
}
}
if (!_Exists)
{
m_Clients.Add(p_Client);
}
}
public void UpdateUserList()
{
string _Users = GetUsers();
foreach (WebIMClientAsyncResult result in m_Clients)
{
result.Content = m_Users;
result.Send(null);
}
m_Clients.Clear();
}
/// <summary>
/// 广播消息
/// </summary>
/// <param name="p_Message"></param>
/// <param name="p_AsyncResult"></param>
public void AddMessage(string p_Message, WebIMClientAsyncResult p_ClientAsyncResult)
{
////保持联连
//if (p_Message == "-1")
//{
// m_Clients.Add(p_ClientAsyncResult);
//}
//else
//{
// //将当前请求的内容输出到客户端
// p_ClientAsyncResult.Content = p_Message;
// p_ClientAsyncResult.Send(null);
// //否则将遍历所有已缓存的client,并将当前内容输出到客户端
// foreach (WebIMClientAsyncResult result in m_Clients)
// {
// result.Content = p_Message;
// result.Send(null);
// }
// //清空所有缓存
// m_Clients.Clear();
//}
}
}
<httpHandlers>
<add path="comet_broadcast.asyn" type="CometSample.WebIMAsyncHandler" verb="POST,GET"/>
</httpHandlers>
<add path="comet_broadcast.asyn" type="CometSample.WebIMAsyncHandler" verb="POST,GET"/>
</httpHandlers>
