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Socket长连接、短连接使用方法——附C#源码

Socket长连接、短连接使用方法——附C#源码

作者: Moment__格调 | 来源:发表于2019-11-19 09:51 被阅读0次

    版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明。
    原文链接:https://blog.csdn.net/yangwohenmai1/article/details/92589072
    对于Socket来说,链接类型一般分为长连接和短连接。

    长连接和短连接在程序上基本没有区别,区别是短连接每次发送完消息都要调用Close()方法来释放资源,而长连接则不调用Close()方法,从而保持持续不断的通信功能。

    GitHub代码服务端:https://github.com/yangwohenmai/TEST/tree/master/SocketServer

    GitHub代码客户端:https://github.com/yangwohenmai/TEST/tree/master/SocketClient

    分为两个项目,一个Socket服务端和一个Socket客户端。结构如下:

    Socket长连接效果图如下,可以持续的发送消息,不需要重复链接:

    Socket服务端代码:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Net;
    using System.Net.Sockets;
    using System.Text;
    using System.Threading;
    using System.Threading.Tasks;
     
    namespace SocketServer
    {
        class Program
        {
            static Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            private static byte[] result = new byte[1024];
     
            static void Main(string[] args)
            {
                SocketServie();
            }
     
     
            public static void SocketServie()
            {
                Console.WriteLine("服务端已启动");
                string host = "127.0.0.1";//IP地址
                int port = 2000;//端口
                socket.Bind(new IPEndPoint(IPAddress.Parse(host), port));
                socket.Listen(100);//设定最多100个排队连接请求   
                Thread myThread = new Thread(ListenClientConnect);//通过多线程监听客户端连接  
                myThread.Start();
                Console.ReadLine();
            }
     
            /// <summary>  
            /// 监听客户端连接  
            /// </summary>  
            private static void ListenClientConnect()
            {
                while (true)
                {
                    Socket clientSocket = socket.Accept();
                    clientSocket.Send(Encoding.UTF8.GetBytes("我是服务器"));
                    Thread receiveThread = new Thread(ReceiveMessage);
                    receiveThread.Start(clientSocket);
                }
            }
     
            /// <summary>  
            /// 接收消息  
            /// </summary>  
            /// <param name="clientSocket"></param>  
            private static void ReceiveMessage(object clientSocket)
            {
                Socket myClientSocket = (Socket)clientSocket;
                while (true)
                {
                    try
                    {
                        //通过clientSocket接收数据  
                        int receiveNumber = myClientSocket.Receive(result);
                        if (receiveNumber == 0)
                            return;
                        Console.WriteLine("接收客户端{0} 的消息:{1}", myClientSocket.RemoteEndPoint.ToString(), Encoding.UTF8.GetString(result, 0, receiveNumber));
                        //给Client端返回信息
                        string sendStr = "已成功接到您发送的消息";
                        byte[] bs = Encoding.UTF8.GetBytes(sendStr);//Encoding.UTF8.GetBytes()不然中文会乱码
                        myClientSocket.Send(bs, bs.Length, 0);  //返回信息给客户端
                        //myClientSocket.Close(); //发送完数据关闭Socket并释放资源//长连接的话就不关闭
                        //Console.ReadLine();
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                        myClientSocket.Close();//关闭Socket并释放资源
                        myClientSocket.Shutdown(SocketShutdown.Both);//禁止发送和上传
                        break;
                    }
                }
            }
        }
    }
    

    Socket客户端代码:

    代码中包含两个方法,分别是长连接和短连接方法。

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Net;
    using System.Net.Sockets;
    using System.Text;
    using System.Threading.Tasks;
     
    namespace SocketClient
    {
        class Program
        {
            static void Main(string[] args)
            {
                //短连接
                shotlink("");
                //长连接
                //longlink();
            }
     
     
     
            /// <summary>
            /// 短连接,最后调用Close释放资源
            /// </summary>
            /// <param name="input"></param>
            public static void shotlink(string input)
            {
                //设定服务器IP地址  
                IPAddress ip = IPAddress.Parse("127.0.0.1");
                Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                try
                {
                    clientSocket.Connect(new IPEndPoint(ip, 2000)); //配置服务器IP与端口  
                    Console.WriteLine("连接服务器成功");
                }
                catch
                {
                    Console.WriteLine("连接服务器失败,请按回车键退出!");
                    Console.ReadLine();
                    return;
                }
     
                string sendMessage = "你好";//发送到服务端的内容
                clientSocket.Send(Encoding.UTF8.GetBytes(sendMessage));//向服务器发送数据,需要发送中文则需要使用Encoding.UTF8.GetBytes(),否则会乱码
                Console.WriteLine("向服务器发送消息:" + sendMessage);
     
                //接受从服务器返回的信息
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                bytes = clientSocket.Receive(recvBytes, recvBytes.Length, 0);    //从服务器端接受返回信息 
                recvStr += Encoding.UTF8.GetString(recvBytes, 0, bytes);
                Console.WriteLine("服务端发来消息:{0}", recvStr);//回显服务器的返回信息
                //每次完成通信后,关闭连接并释放资源
                clientSocket.Close();
                Console.ReadLine();
            }
     
     
            /// <summary>
            /// 长连接不调用Close释放资源
            /// </summary>
            public static void longlink()
            {
                //设定服务器IP地址  
                IPAddress ip = IPAddress.Parse("127.0.0.1");
                Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                try
                {
                    clientSocket.Connect(new IPEndPoint(ip, 2000)); //配置服务器IP与端口  
                    Console.WriteLine("连接服务器成功");
                }
                catch
                {
                    Console.WriteLine("连接服务器失败,请按回车键退出!");
                    Console.ReadLine();
                    return;
                }
     
                //循环读取输入数据
                while (true)
                {
                    Console.WriteLine("请输入");
                    string sentstr = Console.ReadLine();
                    SentMsg(sentstr, clientSocket);
                }
            }
     
     
            /// <summary>
            /// 长连接,不释放资源
            /// </summary>
            /// <param name="sentstr"></param>
            /// <param name="clientSocket"></param>
            public static void SentMsg(string sentstr, Socket clientSocket)
            {
                string sendMessage = "你好";//发送到服务端的内容
                sendMessage = sentstr;//发送到服务端的内容
                //向服务器发送数据,需要发送中文则需要使用Encoding.UTF8.GetBytes(),否则会乱码
                clientSocket.Send(Encoding.UTF8.GetBytes(sendMessage));
                Console.WriteLine("向服务器发送消息:" + sendMessage);
     
                //接受从服务器返回的信息
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                bytes = clientSocket.Receive(recvBytes, recvBytes.Length, 0);    //从服务器端接受返回信息 
                recvStr += Encoding.UTF8.GetString(recvBytes, 0, bytes);
                Console.WriteLine("服务端发来消息:{0}", recvStr);    //回显服务器的返回信息
                //clientSocket.Close();//关闭连接并释放资源//如果是长连接,注释掉close
            }
        }
    }
    

    附一些学习链接:

    TCP/IP详解--TIME_WAIT状态详解:https://blog.csdn.net/yusiguyuan/article/details/21445773

    socket的TIME_WAIT状态的原因及解决办法和避免的办法:https://blog.csdn.net/windyf2013/article/details/78756791

    Socket的长连接和短连接:https://www.cnblogs.com/lcplcpjava/p/6581179.html

    HTTP长连接、短连接究竟是什么?:https://www.cnblogs.com/gotodsp/p/6366163.html

    socket shutdown和close的区别:https://www.cnblogs.com/kex1n/p/7146054.html

    一篇搞懂TCP、HTTP、Socket、Socket连接池:https://blog.csdn.net/liuchaoxuan/article/details/81624311

    socket连接池:https://blog.csdn.net/nokianasty/article/details/8554577

    ————————————————
    版权声明:本文为CSDN博主「佚名兄」的原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接及本声明。
    原文链接:https://blog.csdn.net/yangwohenmai1/article/details/92589072

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