基於 XMPP協議的即時消息服務端簡單實現

服務器端XmppSeverConnection類事件

//在流開始時觸發,一般是最初的響應流
streamParser.OnStreamStart += new StreamHandler(streamParser_OnStreamStart);

//在流結束時觸發,一般是發送</stream:stream>並關閉套接字連接streamParser.OnStreamEnd += new StreamHandler(streamParser_OnStreamEnd);

//在接收到流結點時觸發,這是用得最多的,常用的<message>消息,<Presence>出席消息,< IQ>請求應答消息都在這裏處理
streamParser.OnStreamElement += new StreamHandler(streamParser_OnStreamElement);

 

//此處處理大部份的消息，包括消息路由
private void streamParser_OnStreamElement(object sender, Node e)
        {
            Console.WriteLine("OnStreamElement: " + e.ToString());
            if (e.GetType() == typeof(Presence))
            {
             // 路由presences節
            }
            else if (e.GetType() == typeof(Message))
            {
                // 路由messages節
            }
            else if (e.GetType() == typeof(IQ))
            {
                //處理IQ節
            }
        }

 

 

 /// <summary>
        /// IQ節處理函數
        /// </summary>
        /// <param name="iq">.</param>
        private void ProcessIQ(IQ iq)
        {
            if (iq.Query.GetType() == typeof(Auth))
            {
               Auth auth = iq.Query as Auth;
                this.Username = auth.Username.ToString();

                switch (iq.Type)
                {
                    case IqType.get:
                        iq.SwitchDirection();
                        iq.Type = IqType.result;
                        auth.AddChild(new Element("password"));
                        auth.AddChild(new Element("digest"));
                        Send(iq);
                        break;

                    case IqType.set:
                        // 進行登錄認證
                        if (AccountBus.CheckLogin(auth.Username, auth.Digest, this.SessionId))
                        {
                            iq.SwitchDirection();
                            iq.Type = IqType.result;
                            iq.Query = null;
                            Send(iq);

                            Console.WriteLine(auth.Username + "登錄了" + "   登錄時間:" + System.DateTime.Now.ToString());

                        }
                       else
                        {
//登錄失敗返回錯誤信息
                            iq.SwitchDirection();
                            iq.Type = IqType.error;
                            iq.Query = null;
                            Send(iq);
                        }
                        break;
                }
            }
            else if (iq.Query.GetType() == typeof(Roster))
            {
                ProcessRosterIQ(iq);
            }
        }

 

/// <summary>
        /// 處理IQ節的雜項數據.
        /// </summary>
        /// <param name="iq">The iq.</param>
        private void ProcessRosterIQ(IQ iq)
        {
            if (iq.Type == IqType.get)
            {
                // 發送IQ節的雜項數據
              //這裏我用來下載好友列表
                iq.SwitchDirection();
                iq.Type = IqType.result;
                List<string> friendList = new List<string>();
                friendList = AccountBus.GetFriendName(this.username);
                foreach (string str in friendList)
                {
                    RosterItem ri = new RosterItem();
                    ri.Name = str.Trim();
                    ri.Subscription = SubscriptionType.both;
                    ri.Jid = new agsXMPP.Jid(str.Trim() + "@localhost");
                    ri.AddGroup("localhost");
                    iq.Query.AddChild(ri);
                }
                Send(iq);
            }
        }

 

服務器端開啓監聽5222端口

 

 

 

 while (running)
                {
                    ////
                    allDone.Reset();
                    // Start an asynchronous socket to listen for connections.
                    Console.WriteLine("等待連接");

                    listener.BeginAccept(new AsyncCallback(AcceptCallback), null);

                    //// 等待客戶端連接                    
                     allDone.WaitOne();
                }

如果收到客戶端請求就異步調用AcceptCallback初始化套接字連接
,併爲客戶端建立一個通信線程,新建初始化套接字連接採用異步調
用讀取套接字信息

 

 public XmppSeverConnection(Socket sock)
            : this()
        {
            m_Sock = sock;
            m_Sock.BeginReceive(buffer, 0, BUFFERSIZE, 0, new AsyncCallback(ReadCallback), null);
            m_Sock.SendTimeout = 100;
        }

客戶端與服務器端的交互過程

  1客戶端異步向服務器端發送連接請求

<stream:stream to='localhost' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0' xml:lang='en'>

2服務器端收到請求,初始化迴應流,並隨機生成一相SessionID

 <stream:stream xmlns:stream="http://etherx.jabber.org/streams" from="localhost" id="30e3b8c0" >

3等待服務器返回消息後客戶端發送用戶名（由於在客戶端採用了異步調用
方式，所以UI界面感覺不到等待)

<iq xmlns="jabber:client" id="agsXMPP_1" type="get" to="localhost">
<query xmlns="jabber:iq:auth"><username>test</username></query></iq>

4服務器端收到用戶名等待用戶提供密碼

<iq xmlns="jabber:client" from="localhost" type="result" id="agsXMPP_1">
<query xmlns="jabber:iq:auth"><username>test</username><password />
<digest /></query></iq>

5客戶端提供加密後的密碼

<iq xmlns="jabber:client" id="agsXMPP_2" to="localhost" type="set">
<query xmlns="jabber:iq:auth"><username>test</username>
<digest>e66557d2b67256bf7e9b317a51b6101674a56b5e</digest>
<resource>MiniClient</resource></query></iq>

6服務器端從數據庫驗證用戶名和密碼，並返回結果

iq xmlns="jabber:client" from="localhost" type="result" id="agsXMPP_2" />

7如果返回錯誤,客戶端提示並終斷連接,否則客戶端發送響應數據

8 服務器端返回數據

9 客戶端發送狀態，

10服務器收到狀態，發送IQ節並通知其它用戶.

項目解決方案和類圖


附錄：
推薦使用Spark作爲客戶端