前一段时间写了几篇关于signalr的文章
3.Xamarin android中使用signalr实现即时通讯
在平时的工作中用到了signalr进行消息的推送，所以总结了这几篇文章，今天我就来写一写这个signalr如何使用Group 分组方法群发消息。更全面地了解和学习使用signalr。
在开始学习Signalr Group群发消息之前我们来看一下所实现的效果图：
强大的signalr已经封装好了Group方法，已经在Hub里面集成了Groups分组管理，关键的使用方法如下：
//加入Group组方法 //Context.ConnectionId 连接ID,每个页面连接集线器即会产生唯一ID //roomName分组的名称 Groups.Add(Context.ConnectionId, roomName); //移除Group组 Groups.Remove(Context.ConnectionId, roomName); //作用:调用分组内连接对象,注册客户端Js方法 //Room:分组名称 //new string[0]:过滤(不发送)的连接ID数组
// msg:消息内容
Clients.Group(Room, new string[0]).sendMsg(Room,msg)
在客户端中调用：
chat.client.sendMsg=function(Room,msg){}
当然在实际中如何实现，看下接下来的代码
namespace signalrGroupDemo.Models
{
public class DbContext
{
public DbContext()
{
Users = new List<User>();
Connections = new List<Connection>();
Rooms = new List<Room>();
}
//用户集合
public List<User> Users { get; set; }
//连接集合
public List<Connection> Connections { get; set; }
//房间集合
public List<Room> Rooms { get; set; }
}
//用户类
public class User
{
[Key]
public string UserName { get; set; }
//用户连接
public List<Connection> Connections { get; set; }
//用户房间集合
public virtual List<Room> Rooms { get; set; }
public User()
{
Connections = new List<Connection>();
Rooms = new List<Room>();
}
}
public class Connection
{
//连接ID
public string ConnectionID { get; set; }
//用户代理
public string userAgent { get; set; }
//是否连接
public bool Connected { get; set; }
}
//房间类
public class Room
{
[Key]
public string RommName { get; set; }
//用户集合
public virtual List<User> Users { get; set; }
public Room() {
Users = new List<User>();
}
}
}第二步：引入Signalr类库，添加Hub集线器类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Web;
using Microsoft.AspNet.SignalR;
using signalrGroupDemo.Models;
using Newtonsoft.Json;
using Microsoft.AspNet.SignalR.Hubs;
namespace signalrGroupDemo
{
[HubName("groupHub")]
public class GroupHUb : Hub
{
public void Hello()
{
Clients.All.hello();
}
public static DbContext db = new DbContext();
/// <summary>
/// 重写Hub连接事件
/// </summary>
/// <returns></returns>
public override Task OnConnected()
{
//查询用户
var user = db.Users.Where(w => w.UserName == Context.ConnectionId).FirstOrDefault();
//判断用户是否存在
if (user == null)
{
user = new User()
{
UserName = Context.ConnectionId
};
db.Users.Add(user);
}
//发送房间列表
var rooms = db.Rooms.Select(p => p.RoomName).ToList();
//注册getRooms 获取房间的方法
Clients.Client(Context.ConnectionId).getRoomList(JsonConvert.SerializeObject(rooms));
return base.OnConnected();
}
//更新所有用户的房间列表
private void GetRooms()
{
var rooms =JsonConvert.SerializeObject(db.Rooms.Select(p => p.RoomName).ToList());
Clients.All.getRoomList(rooms);
}
//重写Hub链接断开事件
public override Task OnDisconnected(bool s)
{
var user = db.Users.Where(u=>u.UserName==Context.ConnectionId).FirstOrDefault();
//判断用户是否存在，存在则删除
if (user != null)
{
//删除用户
db.Users.Remove(user);
}
return base.OnDisconnected(s);
}
//加入聊天室
public void AddRoom(string roomName)
{
//查询聊天室
var room = db.Rooms.Find(a=>a.RoomName==roomName);
//存在则加入
if (room != null)
{
//查找房间中是否存在此用户
var isUser = room.Users.Where(w => w.UserName == Context.ConnectionId).FirstOrDefault();
//不存在则加入
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);
//注册加入聊天室的addRoom方法
Clients.Client(Context.ConnectionId).addRoom(roomName);
}
else
{
Clients.Client(Context.ConnectionId).showMessage("请勿重复加入房间");
}
}
}
//创建聊天室
public void CreateRoom(string roomName)
{
var room = db.Rooms.Find(a=>a.RoomName==roomName);
if (room == null)
{
Room r = new Room() { RoomName = roomName };
//将房间加入列表
db.Rooms.Add(r);
AddRoom(roomName);
Clients.Client(Context.ConnectionId).showMessage("房间创建完成");
GetRooms();
}
else
{
Clients.Client(Context.ConnectionId).showMessage("房间名重复");
}
}
//退出聊天室
public void ExitRoom(string roomName)
{
//查找房间是否存在
var room = db.Rooms.Find(a=>a.RoomName==roomName);
//存在则删除
if (room != null)
{
//查找要删除的用户
var user = room.Users.Where(p => p.UserName == Context.ConnectionId).FirstOrDefault();
//移除此用户
room.Users.Remove(user);
//如果房间人数为0，怎删除房间
if (room.Users.Count == 0)
{
db.Rooms.Remove(room);
}
//Groups Remove移除分组方法
Groups.Remove(Context.ConnectionId,roomName);
//提示客户端
Clients.Client(Context.ConnectionId).removeRoom("退出成功");
}
}
//给分组内所有用户发送消息
public void SendMsg(string Room,string Message)
{
Clients.Group(Room, new string[0]).sendMessage(Room,Message+" "+DateTime.Now.ToString());
}
}
}
第三步：前端调用注册的Server方法和注册Client方法
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>signalr group 分组方法的使用</title>
<script src="~/Scripts/jquery-1.10.2.min.js"></script>
<script src="~/Scripts/jquery.signalR-2.2.1.min.js"></script>
@*这里是虚拟目录，也就是你再OWIN Startup中注册的地址*@
<script src="~/signalr/hubs"></script>
</head>
<body>
<div><div>名称：<p id="userName"></p></div>
房间名：<input type="text" value="ceshi" id="roomName"/>
<button id="createRoom">创建聊天室</button></div>
<div style="float:left;border:double">
<div>房间列表</div><ul id="roomList"></ul>
</div>
<div id="rooms"></div>
<script>
var chat;
var roomCount =0;
$(function(){
chat = $.connection.groupHub;
//调用hub中注册的showMessage方法
chat.client.showMessage= function (message)
{
alert(message);
}
//调用hub中注册的sendMessage 方法
chat.client.sendMessage= function (roomname, message)
{
debugger
$("#" + roomname).find("ul").each(function () {
$(this).append('<li>'+message+'</li>');
})
}
//调用hub中removeRoom 退出房间方法
chat.client.removeRoom = function (data)
{
alert(data);
}
//注册查询房间列表的方法
chat.client.getRoomList = function (data) {
if (data) {
debugger
var jsonData = $.parseJSON(data);
$("#roomList").html(" ");
for (var i = 0; i < jsonData.length; i++) {
var html = '<li>房间名:' + jsonData[i] + '<button roomName="' + jsonData[i] + '" onclick="addRoom(this)">加入</button> </li>'
$("#roomList").append(html);
}
}
}
//调用hub中addRoom 加入房间的方法
chat.client.addRoom = function (roomName)
{
var html = '<div style="float:left; margin-left:30px; border:double" id="' + roomName + '" roomname="' + roomName + '" ><button onclick="removeRoom(this)">退出房间</button> \
' + roomName + '房间聊天记录如下:<ul></ul> <input type="text"/> <button onclick="send(this)">发送</button><div>'
$("#rooms").append(html);
}
//获取用户名称
$("#userName").html(prompt('请输入您的名称:', ''));
$.connection.hub.start().done(function () {
$("#createRoom").click(function ()
{
if (roomCount < 2) {
chat.server.createRoom($("#roomName").val());
}
else
{
alert("聊天窗口只允许有2个");
}
})
})
})
//发送消息的方法
function send(btn)
{
var message = $(btn).prev().val();
var room = $(btn).parent();
var userName = $("#userName").html();
message = userName + ":" + message;
var roomName = $(room).attr("roomName");
chat.server.sendMsg(roomName,message);
}
//退出房间
function removeRoom(btn)
{
var room = $(btn).parent();
var roomName = $(room).attr("roomName");
chat.server.exitRoom(roomName);
}
//加入房间
function addRoom(roomName)
{
var data = $(roomName).attr("roomName");
chat.server.addRoom(data);
}
</script>
</body>
</html>