.Net之美读书笔记10(网络编程一)

网络编程(Socket)

这里对网络编程做下简单的整理，填补下自己这方面的知识空白。如果想了解请参考张子阳的.Net之美.

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概念讲述

• TCP:面向连接的传输协议（网络协议的一种）
• 远程主机： 跨进程访问即为远程访问
• 套接字： 传输层与应用层的纽带，可使应用层编程不用关心传输层

服务器与客户端链接

服务端开启监听服务，客户端链接服务端。新建两个控制台程序Server/Client。
Server:

static void Main(string[] args)
		{
			Console.WriteLine("Server is running ...");
			IPAddress ip = IPAddress.Parse("127.0.0.1");
			int port = 8500;

			TcpListener listener = new TcpListener(ip, port);
			listener.Start();

			Console.WriteLine("\n\n Enter \"Q\" exit.");
			ConsoleKey key;
			do
			{
				key = Console.ReadKey(true).Key;
			} while (key != ConsoleKey.Q);
		}

Client:

static void Main(string[] args)
		{
			Console.WriteLine("Client Running");

			TcpClient client = new TcpClient();

			IPAddress serverIp = IPAddress.Parse("127.0.0.1");
			int serverPort = 8500;

			try
			{
				client.Connect(serverIp, serverPort);
			}
			catch (Exception ex)
			{
				Console.WriteLine(ex.Message);
				return;
			}

			Console.WriteLine("Server Connected!{0} --> {1}", client.Client.LocalEndPoint, client.Client.RemoteEndPoint);

			Console.WriteLine("\n\n Enter \"Q\" exit.");
			ConsoleKey key;
			do
			{
				key = Console.ReadKey(true).Key;
			} while (key != ConsoleKey.Q);
		}

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命令行运行netstat -a查看端口连接状态

服务端获取客户端链接

AcceptTcpClient()为阻塞方法，调用后线程等待客户端链接
Server:

		static void Main(string[] args)
		{
			Console.WriteLine("Server is running ...");
			IPAddress ip = IPAddress.Parse("127.0.0.1");
			int port = 8500;

			TcpListener listener = new TcpListener(ip, port);
			listener.Start();
			Console.WriteLine("Start Listening ...");

			//目的获取多个客户端信息
			while(true)
			{
				try
				{
					//获取一个连接，中断方法(等待客户端的链接)
					TcpClient remoteClient = listener.AcceptTcpClient();
					//打印链接到的客户端信息
					Console.WriteLine("Client Connected!{0}<-{1}", remoteClient.Client.LocalEndPoint, remoteClient.Client.RemoteEndPoint);
				}
				catch (Exception ex)
				{
					Console.WriteLine("Error:" + ex.Message);
				}
			}
		}

客户端发送信息服务端接受

Server:

static void Main(string[] args)
		{
			int BufferSize = 8192;

			Console.WriteLine("Server is running ...");
			IPAddress ip = IPAddress.Parse("127.0.0.1");
			int port = 8500;

			TcpListener listener = new TcpListener(ip, port);
			listener.Start();
			Console.WriteLine("Start Listening ...");

			//目的获取多个客户端信息
			while(true)
			{
				try
				{
					//获取一个连接，中断方法(等待客户端的链接)
					TcpClient remoteClient = listener.AcceptTcpClient();
					//打印链接到的客户端信息
					Console.WriteLine("Client Connected!{0}<-{1}", remoteClient.Client.LocalEndPoint, remoteClient.Client.RemoteEndPoint);

					//获得流并写入buffer中
					NetworkStream streamToClient = remoteClient.GetStream();
					byte[] buffer = new byte[BufferSize];
					int bytesRead = streamToClient.Read(buffer, 0, buffer.Length);
					Console.WriteLine("Reading data,{0}bytes",bytesRead);

					//获得请求的字符串
					string msg = Encoding.Unicode.GetString(buffer, 0, bytesRead);
					Console.WriteLine("Received:{0}",msg);
				}
				catch (Exception ex)
				{
					Console.WriteLine("Error:" + ex.Message);
				}
			}
		}

Client:

static void Main(string[] args)
		{
			Console.WriteLine("Client Running");

			TcpClient client = new TcpClient();

			IPAddress serverIp = IPAddress.Parse("127.0.0.1");
			int serverPort = 8500;

			try
			{
				client.Connect(serverIp, serverPort);
			}
			catch (Exception ex)
			{
				Console.WriteLine(ex.Message);
				return;
			}

			Console.WriteLine("Server Connected!{0} --> {1}", client.Client.LocalEndPoint, client.Client.RemoteEndPoint);

			string msg = "\"Welcome To TraceFact.Net\"";
			NetworkStream streamToServer = client.GetStream();

			byte[] buffer = Encoding.Unicode.GetBytes(msg);
			streamToServer.Write(buffer, 0, buffer.Length);
			Console.WriteLine("Sent:{0}",msg);
			Console.WriteLine("\n\n Enter \"Q\" exit.");
			ConsoleKey key;
			do
			{
				key = Console.ReadKey(true).Key;
			} while (key != ConsoleKey.Q);
		}