c# TCP通讯(简易服务器)

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网络中两个主机用socket连接=.=

交互需要双方相同的协议,服务器的ip地址,服务器进程需要port

客户端咱们不管,给服务器配置成接收所有ip与端口

所以

socket只需要指定协议,端口即可

 

没有异常处理,没有关闭,没有人数限制,没有面向对象

服务器思路:

一个服务器自身socket

1. 指定协议

1. 指定接收地址port
2. 绑定地址与port
3. 让socket处于监听状态(参数别管,这只是个等待队列长度,并不是写了10就是只接受10个客户端请求(那么怎么写呢,末尾给出代码)
4. 获取客户端socket,开启一个线程来处理数据(不然只接收一行)
5. 想加双工通信就是在服务器和客户端各多开个线程,这里少写点代码,看起来舒服

服务端

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace Server01
{
    class Server01
    {
        Socket serverSocket;
        public Server01()
        {
            serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint point = new IPEndPoint(IPAddress.Any, 9999);
            serverSocket.Bind(point);
            serverSocket.Listen(10);
            Console.WriteLine("服务器启动成功");
            AccessToClient();
        }

        public void AccessToClient()
        {
            Socket clientSocket = serverSocket.Accept();
            Console.WriteLine("连接客户端成功");
            Thread clientThread = new Thread(AcceptClientData);
            clientThread.Start(clientSocket);
            AccessToClient();
        }

        public void AcceptClientData(object obj)
        {
            Socket clientSocket = obj as Socket;
            Byte[] bytes = new Byte[1024];
            //这里客户端断开会异常 加try catch
            try
            {
                int length = clientSocket.Receive(bytes);
                //这里length==0 不走
                if (length > 0)
                {
                    String str = Encoding.UTF8.GetString(bytes, 0, length);
                    Console.WriteLine("o((>ω< ))o:" + str);
                    AcceptClientData(obj);
                }
            }
            catch
            {
                Console.WriteLine("客户端断开");
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Server01 server = new Server01();
        }
    }
}

客户端思路:

1. 也就是服务器的开头,创建socket
2. 配置ip port
3. 这一步不要绑定,直接连接就行
4. 这里连接服务器写了个发送数据,可以自测
5. 要接收服务器信息,多开个线程就行相信你可以的=.=

客户端

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace Client01
{
    class Client01
    {
        Socket clientSocket;
        public Client01()
        {
            clientSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint point = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9999);
            Console.WriteLine("客户端启动成功");
            clientSocket.Connect(point);
            AccessToServer();
        }
        void AccessToServer()
        {
            SendMessageToServer();
        }

        void SendMessageToServer()
        {
            while (true)
            {
                String str = Console.ReadLine();
                clientSocket.Send(Encoding.UTF8.GetBytes(str));
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Client01 client = new Client01();
        }
    }
}

添加信号量,用于设置连接数量,这里写的3,参考:https://www.cnblogs.com/yifengjianbai/p/5468449.html

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;

namespace Server01
{
    class Server01
    {
        Socket serverSocket;
        Semaphore serverSemaphore;
        public Server01()
        {
            serverSemaphore = new Semaphore(3, 3);
            serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint point = new IPEndPoint(IPAddress.Any, 9999);
            serverSocket.Bind(point);
            serverSocket.Listen(10);
            Console.WriteLine("服务器启动成功");
            AccessToClient();
        }

        public void AccessToClient()
        {
            serverSemaphore.WaitOne();
            Socket clientSocket = serverSocket.Accept();
            Console.WriteLine("连接客户端成功");
            Thread clientThread = new Thread(AcceptClientData);
            clientThread.Start(clientSocket);
            AccessToClient();
        }

        public void AcceptClientData(object obj)
        {
            Socket clientSocket = obj as Socket;
            Byte[] bytes = new Byte[1024];
            //这里客户端断开会异常 加try catch
            try
            {
                int length = clientSocket.Receive(bytes);
                //这里length==0 不走
                if (length > 0)
                {
                    String str = Encoding.UTF8.GetString(bytes, 0, length);
                    Console.WriteLine("o((>ω< ))o:" + str);
                    AcceptClientData(obj);
                }
            }
            catch
            {
                Console.WriteLine("客户端断开");
                serverSemaphore.Release();
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Server01 server = new Server01();
        }
    }
}