Socket通信原理

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//添加Socket類
using System.Net;
using System.Net.Sockets;
namespace SockeConsoleServer
{
    class Program
    {
        static void Main(string[] args)
        {
            int port = 2000;
            string host = "127.0.0.1";
            //創建終結點 EndPoint
            IPAddress ip = IPAddress.Parse(host);
            IPEndPoint ipe = new IPEndPoint(ip,port);
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//創建一個socket對象，如果用UDP協議，則要用SocketTyype.Dgarm類型套接字
            s.Bind(ipe);  //綁定EndPoint對象（2000端口和ip地址）
            s.Listen(0);  //開始監聽
            Console.WriteLine("等待客戶端連接"); //打印輸出
            //接受Client連接，爲此連接建立新的Socket，並接受消息
            Socket temp = s.Accept(); //爲新建立的連接創建新的Socket
            Console.WriteLine("建立連接");
            string recvStr = "";
            byte[] recvBytes = new byte[1024];
            int bytes;
            bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//從客戶端接受消息
            recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
            //給Client端返回消息
            Console.WriteLine("server get message:{0}", recvStr); //把客戶端傳來的消息顯示出來
            string sendStr = "ok!Client send message successful!";
            byte[] bs = Encoding.ASCII.GetBytes(sendStr);
            temp.Send(bs, bs.Length, 0); //返回信息給客戶端
            temp.Close();
            s.Close();
            Console.ReadLine();
            //用netstat偵聽下端口的使用情況
        }
    }
}





using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
//添加用於socket的類
using System.Net;
using System.Net.Sockets;
namespace SocketConsoleClient
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                int port = 2000;
                string host = "127.0.0.1";
                //創建終結點 EndPoint
                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint ipe = new IPEndPoint(ip, port); //把ip和端口轉化爲IPEndPoint的實例
                //創建Socket並連接到服務器
                Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);  //創建socket
                Console.WriteLine("Connecting...");
                c.Connect(ipe); //連接到服務器
                //向服務器發送消息
                string sendStr = "Hello,this is a socket test";
                byte[] bs = Encoding.ASCII.GetBytes(sendStr); //把字符串編寫爲字節
                Console.WriteLine("Send message"); //打印輸出
                c.Send(bs, bs.Length, 0); //發送消息
                //接受從服務器返回的信息
                string recvStr = "";
                byte[] recvBytes = new byte[1024];
                int bytes;
                bytes = c.Receive(recvBytes, recvBytes.Length, 0);  //從服務器端接受返回信息
                recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
                Console.WriteLine("client get message:{0}", recvStr); //回顯服務器的返回信息
                Console.ReadLine();
                //一定記着用完Socket後要關閉
                c.Close();
            }
            catch (ArgumentException e)
            {
                Console.WriteLine("argumentNullException:{0}",e);//打印輸出
            }
            catch(SocketException e)
            {
                Console.WriteLine("SocketException:{0}",e);//打印輸出
            }           
        }
    }
}