用SignalR 2.0開發客服系統[系列2:實現聊天室]

前言

 

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上周發表了

用SignalR 2.0開發客服系統[系列1:實現群發通訊]

這篇文章,得到了很多幫助和鼓勵,小弟在此真心的感謝大家的支持..

這周繼續系列2,實現聊天室的功能.

 

 

開發環境

 開發工具:VS2013 旗艦版

 數據庫:未用

 操作系統:WIN7旗艦版

 

正文開始

首先我們來看看最終效果:

 

 

 

正式開始:

SignalR作為一個強大的集線器,已經在hub里面集成了Gorups,也就是分組管理,使用方法如下:

//作用:將連接ID加入某個組
//Context.ConnectionId 連接ID,每個頁面連接集線器即會產生唯一ID
//roomName分組的名稱
Groups.Add(Context.ConnectionId, roomName);

//作用:將連接ID從某個分組移除
Groups.Remove(Context.ConnectionId, roomName);

//作用:調用分組內連接對象注冊的本地JS
//XXX:本地JS名稱
//Room:分組名稱
// new string[0]:過濾(不發送)的連接ID數組
 Clients.Group(Room, new string[0]).XXXX

 

其實SignalR已經幫我們封裝的很好了,關鍵代碼其實就這三句..

 

廢話不多說,下面開始講我的實現.

 

首先實體類(參考微軟Demo):

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNet.SignalR;

namespace SignalRTest
{
    public class UserContext 
    {
        public UserContext()
        {
            Users = new List<User>();
            Connections = new List<Connection>();
            Rooms = new List<ConversationRoom>();
        }
        //用戶集合
        public List<User> Users { get; set; }
        //連接集合
        public List<Connection> Connections { get; set; }
        //房間集合
        public List<ConversationRoom> Rooms { get; set; }
    }

    public class User
    {
        [Key]
        //用戶名
        public string UserName { get; set; }
        //用戶的連接
        public List<Connection> Connections { get; set; }
        //用戶房間集合
        public virtual List<ConversationRoom> Rooms { get; set; }

        public User()
        {
            Connections = new List<Connection>();
            Rooms = new List<ConversationRoom>();
        }
    }

    public class Connection
    {
        //連接ID
        public string ConnectionID { get; set; }

        //用戶代理
        public string UserAgent { get; set; }
        //是否連接
        public bool Connected { get; set; }
    }

    /// <summary>
    /// 房間類
    /// </summary>
    public class ConversationRoom
    {
        //房間名稱
        [Key]
        public string RoomName { get; set; }
        //用戶集合
        public virtual List<User> Users { get; set; }


        public ConversationRoom()
        {
            Users = new List<User>();
        }
    }

}

 

然后聊天室的Hub(這里我就不解釋了,每句話我都加了注釋,注釋+代碼方便大家理解..):

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.AspNet.SignalR;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR.Hubs;
using Newtonsoft.Json;

namespace SignalRTest
{
    [HubName("groupsHub")]
    public class GroupsHub : Hub
    {
        public static UserContext db = new UserContext();
        public void Hello()
        {
            Clients.All.hello();
        }
        /// <summary>
        /// 重寫Hub連接事件
        /// </summary>
        /// <returns></returns>
        public override Task OnConnected()
        {

                // 查詢用戶。
                var user = db.Users.SingleOrDefault(u => u.UserName == Context.ConnectionId);

                //判斷用戶是否存在,否則添加
                if (user == null)
                {
                    user = new User()
                    {
                        UserName = Context.ConnectionId
                    };
                    db.Users.Add(user);
                   
                }
               //發送房間列表
                var itme = from a in db.Rooms
                           select new { a.RoomName };
                Clients.Client(this.Context.ConnectionId).getRoomlist(JsonConvert.SerializeObject(itme.ToList()));
            return base.OnConnected();
        }

        /// <summary>
        /// 更新所有用戶的房間列表
        /// </summary>
        private void GetRoomList()
        {
           

            var itme = from a in db.Rooms
                       select new { a.RoomName };
            string jsondata = JsonConvert.SerializeObject(itme.ToList());
            Clients.All.getRoomlist(jsondata);
            
        }
        /// <summary>
        /// 重寫Hub連接斷開的事件
        /// </summary>
        /// <returns></returns>
        public override Task OnDisconnected()
        {
             var user = db.Users.Where(u => u.UserName == Context.ConnectionId).FirstOrDefault();
            
                //判斷用戶是否存在,存在則刪除
                if (user != null)
                {
                    //刪除用戶
                    db.Users.Remove(user);
                    // 循環用戶的房間,刪除用戶
                    foreach (var item in user.Rooms)
                    {
                        RemoveFromRoom(item.RoomName);
                        
                    }
                }


            return base.OnDisconnected();
        }

        /// <summary>
        /// 加入聊天室
        /// </summary>
        /// <param name="roomName"></param>
        public void AddToRoom(string roomName)
        {
                //查詢聊天室
                var room = db.Rooms.Find(a=>a.RoomName==roomName);
               //存在則加入
                if (room != null)
                {
                    //查找房間中是否存在此用戶
                    var isuser = room.Users.Where(a => a.UserName == Context.ConnectionId).FirstOrDefault();
                    //不存在則加入
                    if (isuser == null)
                    {
                        var user = db.Users.Find(a => a.UserName == Context.ConnectionId);
                        user.Rooms.Add(room);
                        room.Users.Add(user);
                        Groups.Add(Context.ConnectionId, roomName);
                        //調用此連接用戶的本地JS(顯示房間)
                        Clients.Client(Context.ConnectionId).addRoom(roomName);
                    }
                    else
                    {
                        Clients.Client(Context.ConnectionId).showMessage("請勿重復加入房間!");
                    }
                }
               
            
        }

        /// <summary>
        /// 創建聊天室
        /// </summary>
        /// <param name="roomName"></param>
        public void CreatRoom(string roomName)
        {
            var room = db.Rooms.Find(a => a.RoomName == roomName);
            if (room == null)
            {
                ConversationRoom cr = new ConversationRoom()
                {
                    RoomName = roomName
                };
                //將房間加入列表
                db.Rooms.Add(cr);
                AddToRoom(roomName);
                Clients.Client(Context.ConnectionId).showMessage("房間創建完成!");
                GetRoomList();
            }
            else
            {
                Clients.Client(Context.ConnectionId).showMessage("房間名重復!");
            }

        }

        /// <summary>
        /// 退出聊天室
        /// </summary>
        /// <param name="roomName"></param>
        public void RemoveFromRoom(string roomName)
        {

                //查找房間是否存在
            var room = db.Rooms.Find(a => a.RoomName == roomName);
              //存在則進入刪除
                if (room != null)
                {
                    //查找要刪除的用戶
                    var user = room.Users.Where(a => a.UserName == Context.ConnectionId).FirstOrDefault();
                    //移除此用戶
                    room.Users.Remove(user);
                    //如果房間人數為0,則刪除房間
                    if (room.Users.Count <= 0)
                    {
                        db.Rooms.Remove(room);

                    }
                    Groups.Remove(Context.ConnectionId, roomName);
                    //提示客戶端
                    Clients.Client(Context.ConnectionId).removeRoom("退出成功!");
                }
         
            
        }
        /// <summary>
        /// 給分組內所有的用戶發送消息
        /// </summary>
        /// <param name="Room">分組名</param>
        /// <param name="Message">信息</param>
        public void SendMessage(string Room, string Message)
        {
            Clients.Group(Room, new string[0]).sendMessage(Room,Message+" "+DateTime.Now.ToString());
        }
       


    }
}

 

前端HTML+JS:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="Scripts/jquery-1.10.2.min.js"></script>
    <script src="Scripts/jquery.signalR-2.0.0.min.js"></script>
    <!--這里要注意,這是虛擬目錄,也就是你在OWIN Startup中注冊的地址-->
    <script src="signalr/hubs"></script>

    <script>
        var chat
        var roomcount = 0;
        $(function () {
                chat = $.connection.groupsHub;
                chat.client.showMessage = function (Message) {

                    alert(Message);
                }
                chat.client.sendMessage = function (roomname, message) {
                    $("#" + roomname).find("ul").each(function () {
                        $(this).append('<li>'+message+'</li>')
                    })
                }
                chat.client.removeRoom = function (data) {
                    alert(data);
                }
                chat.client.addRoom = function (roomname) {
                    var html = '<div style="float:left; margin-left:30px; border:double" id="' + roomname + '" roomname="' + roomname + '"><button onclick="RemoveRoom(this)">退出</button>\
                                    ' + roomname + '房間\
                                                聊天記錄如下:<ul>\
                                                </ul>\
                                    <input type="text" /> <button onclick="SendMessage(this)">發送</button>\
                                    </div>'
                    $("#RoomList").append(html);
                }
                //注冊查詢房間列表的方法
                chat.client.getRoomlist = function (data) {
                    if (data) {
                        var jsondata = $.parseJSON(data);
                        $("#roomlist").html(" ");
                        for (var i = 0; i < jsondata.length; i++) {
                            var html = ' <li>房間名:' + jsondata[i].RoomName + '<button roomname="'+jsondata[i].RoomName+'" onclick="AddRoom(this)">加入</button></li>';
                            $("#roomlist").append(html);
                        }
                    }
                }
                // 獲取用戶名稱。
                $('#username').html(prompt('請輸入您的名稱:', ''));

                $.connection.hub.start().done(function () {
                    $('#CreatRoom').click(function () {
                        if (roomcount < 2) {
                            chat.server.creatRoom($("#Roomname").val());
                            roomcount++;
                        } else {
                            alert("聊天窗口只允許有2個")
                        }
                    })
                });

        });
        function SendMessage(btn) {
            var message = $(btn).prev().val();
            var room = $(btn).parent();
            var username = $("#username").html();
            message = username + ":" + message;
            var roomname = $(room).attr("roomname");
            chat.server.sendMessage(roomname,message);

        }
        function RemoveRoom(btn) {
            var room = $(btn).parent();
            var roomname = $(room).attr("roomname");
            chat.server.removeFromRoom(roomname);
        }
        function AddRoom(roomname) {
             var data =$(roomname).attr("roomname");
             chat.server.addToRoom(data);
        }

    </script>

</head>
<body>
    <div>
        <div>名稱:<p id="username"></p></div>
        輸入房間名:
        <input type="text" value="asdasd" id="Roomname" />
        <button id="CreatRoom">創建聊天室</button>
    </div>
    <div style="float:left;border:double">
        <div>房間列表</div>
        <ul id="roomlist">
        </ul>
    </div>
    <div id="RoomList">
    </div>
</body>
</html>

至此就完成了基本的聊天室功能,有許多邏輯寫的不到位的情況,請大家海涵.

我會堅持寫完本系列..

源碼下載地址:

http://pan.baidu.com/s/1pJLxwF5