socket 怎么设置心跳判断连接
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在定时器里隔段时间就发送几个字节的数据。如果3次没有返回则断开
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客户端:
30秒发送一个心跳包到服务器
服务器:
接收到心跳包,更新LastHeartbeatTime
并且有一个线程,一分钟扫描一次,如果LastHeartbeatTime超过一分钟没更新的视为下线
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- C# code
模拟心跳的机制 使用直接调用函数模拟心跳,没有涉及到socket 写得不好,不要太挑剔
using System; using System.Collections.Generic; using System.Threading; namespace ConsoleApplication1 { // 客户端离线委托 public delegate void ClientOfflineHandler(ClientInfo client); // 客户端上线委托 public delegate void ClientOnlineHandler(ClientInfo client); public class Program { /// <summary> /// 客户端离线提示 /// </summary> /// <param name="clientInfo"></param> private static void ClientOffline(ClientInfo clientInfo) { Console.WriteLine(String.Format("客户端{0}离线,离线时间:\t{1}", clientInfo.ClientID, clientInfo.LastHeartbeatTime)); } /// <summary> /// 客户端上线提示 /// </summary> /// <param name="clientInfo"></param> private static void ClientOnline(ClientInfo clientInfo) { Console.WriteLine(String.Format("客户端{0}上线,上线时间:\t{1}", clientInfo.ClientID, clientInfo.LastHeartbeatTime)); } static void Main() { // 服务端 Server server = new Server(); // 服务端离线事件 server.OnClientOffline += ClientOffline; // 服务器上线事件 server.OnClientOnline += ClientOnline; // 开启服务器 server.Start(); // 模拟100个客户端 Dictionary<Int32, Client> dicClient = new Dictionary<Int32, Client>(); for (Int32 i = 0; i < 100; i++) { // 这里传入server只是为了方便而已 Client client = new Client(i + 1, server); dicClient.Add(i + 1, client); // 开启客户端 client.Start(); } System.Threading.Thread.Sleep(1000); while (true) { Console.WriteLine("请输入要离线的ClientID,输入0则退出程序:"); String clientID = Console.ReadLine(); if (!String.IsNullOrEmpty(clientID)) { Int32 iClientID = 0; Int32.TryParse(clientID, out iClientID); if (iClientID > 0) { Client client; if (dicClient.TryGetValue(iClientID, out client)) { // 客户端离线 client.Offline = true; } } else { return; } } } } } /// <summary> /// 服务端 /// </summary> public class Server { public event ClientOfflineHandler OnClientOffline; public event ClientOnlineHandler OnClientOnline; private Dictionary<Int32, ClientInfo> _DicClient; /// <summary> /// 构造函数 /// </summary> public Server() { _DicClient = new Dictionary<Int32, ClientInfo>(100); } /// <summary> /// 开启服务端 /// </summary> public void Start() { // 开启扫描离线线程 Thread t = new Thread(new ThreadStart(ScanOffline)); t.IsBackground = true; t.Start(); } /// <summary> /// 扫描离线 /// </summary> private void ScanOffline() { while (true) { // 一秒扫描一次 System.Threading.Thread.Sleep(1000); lock (_DicClient) { foreach (Int32 clientID in _DicClient.Keys) { ClientInfo clientInfo = _DicClient[clientID]; // 如果已经离线则不用管 if (!clientInfo.State) { continue; } // 判断最后心跳时间是否大于3秒 TimeSpan sp = System.DateTime.Now - clientInfo.LastHeartbeatTime; if (sp.Seconds >= 3) { // 离线,触发离线事件 if (OnClientOffline != null) { OnClientOffline(clientInfo); } // 修改状态 clientInfo.State = false; } } } } } /// <summary> /// 接收心跳包 /// </summary> /// <param name="clientID">客户端ID</param> public void ReceiveHeartbeat(Int32 clientID) { lock (_DicClient) { ClientInfo clientInfo; if (_DicClient.TryGetValue(clientID, out clientInfo)) { // 如果客户端已经上线,则更新最后心跳时间 clientInfo.LastHeartbeatTime = System.DateTime.Now; } else { // 客户端不存在,则认为是新上线的 clientInfo = new ClientInfo(); clientInfo.ClientID = clientID; clientInfo.LastHeartbeatTime = System.DateTime.Now; clientInfo.State = true; _DicClient.Add(clientID, clientInfo); // 触发上线事件 if (OnClientOnline != null) { OnClientOnline(clientInfo); } } } } } /// <summary> /// 客户端 /// </summary> public class Client { public Server Server; public Int32 ClientID; public Boolean Offline; /// <summary> /// 构造函数 /// </summary> /// <param name="clientID"></param> /// <param name="server"></param> public Client(Int32 clientID, Server server) { ClientID = clientID; Server = server; Offline = false; } /// <summary> /// 开启客户端 /// </summary> public void Start() { // 开启心跳线程 Thread t = new Thread(new ThreadStart(Heartbeat)); t.IsBackground = true; t.Start(); } /// <summary> /// 向服务器发送心跳包 /// </summary> private void Heartbeat() { while (!Offline) { // 向服务端发送心跳包 Server.ReceiveHeartbeat(ClientID); System.Threading.Thread.Sleep(1000); } } } /// <summary> /// 客户端信息 /// </summary> public class ClientInfo { // 客户端ID public Int32 ClientID; // 最后心跳时间 public DateTime LastHeartbeatTime; // 状态 public Boolean State; } }