C#:Socket通信

C#:Socket通信

建立项目：C# 控制台应用程序

Server代码

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
//添加Socket类 
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"; 
  
            //创建终结点 
            IPAddress ip = IPAddress.Parse(host); 
            IPEndPoint ipe = new IPEndPoint(ip,port);  
  
            //创建Socket并开始监听 
  
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); //创建一个Socket对象，如果用UDP协议，则要用SocketTyype.Dgram类型的套接字 
            s.Bind(ipe);    //绑定EndPoint对象(2000端口和ip地址) 
            s.Listen(0);    //开始监听 
  
            Console.WriteLine("等待客户端连接"); 
  
            //接受到Client连接，为此连接建立新的Socket，并接受消息 
            Socket temp = s.Accept();   //为新建立的连接创建新的Socket 
            Console.WriteLine("建立连接"); 
            string recvStr = ""; 
            byte[] recvBytes = new byte[1024]; 
            int bytes; 
            bytes = temp.Receive(recvBytes,recvBytes.Length,0); //从客户端接受消息 
            recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes); 
  
            //给Client端返回信息 
            Console.WriteLine("server get message:{0}",recvStr);    //把客户端传来的信息显示出来 
            string sendStr = "ok!Client send message successful!"; 
            byte[] bs = Encoding.ASCII.GetBytes(sendStr); 
            temp.Send(bs,bs.Length,0);  //返回信息给客户端 
            temp.Close(); 
            s.Close(); 
            Console.ReadLine(); 
  
        } 
    } 
}

Client代码：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
//添加用于Socket的类 
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"; 
                //创建终结点EndPoint 
                IPAddress ip = IPAddress.Parse(host); 
                IPEndPoint ipe = new IPEndPoint(ip, port);   //把ip和端口转化为IPEndPoint的实例 
  
                //创建Socket并连接到服务器 
                Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);   //  创建Socket 
                Console.WriteLine("Connecting..."); 
                c.Connect(ipe); //连接到服务器 
  
                //向服务器发送信息 
                string sendStr = "Hello,this is a socket test"; 
                byte[] bs = Encoding.ASCII.GetBytes(sendStr);   //把字符串编码为字节 
  
                Console.WriteLine("Send message"); 
                c.Send(bs, bs.Length, 0); //发送信息 
  
                //接受从服务器返回的信息 
                string recvStr = ""; 
                byte[] recvBytes = new byte[1024]; 
                int bytes; 
                bytes = c.Receive(recvBytes, recvBytes.Length, 0);    //从服务器端接受返回信息 
                recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes); 
                Console.WriteLine("client get message:{0}", recvStr);    //回显服务器的返回信息 
  
                Console.ReadLine(); 
                //一定记着用完Socket后要关闭 
                c.Close(); 
            } 
            catch (ArgumentException e) 
            { 
                Console.WriteLine("argumentNullException:{0}", e); 
            } 
            catch (SocketException e) 
            { 
                Console.WriteLine("SocketException:{0}",e); 
            } 
        } 
    } 
}

代码敲完之后，先跑下服务器，用netstat侦听下端口的使用情况

运行客户端(客户端的控制台及服务器控制台界面显示)

再用netstat侦听下端口状态

此时端口已连接正常，服务器已经与客户端正常通信