Socket通信原理

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 EndPoint
IPAddress ip = IPAddress.Parse(host);
IPEndPoint ipe = new IPEndPoint(ip,port);
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.Dgarm类型套接字
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"); //打印输出
//接受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端返回消息
Console.WriteLine("server get message:{0}", recvStr); //把客户端传来的消息显示出来
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();
//用netstat侦听下端口的使用情况
}
}
}

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
//向服务器发送消息
string sendStr = "Hello,this is a socket test";
byte[] bs = Encoding.ASCII.GetBytes(sendStr); //把字符串编写为字节
Console.WriteLine("Send message"); //打印输出
c.Send(bs, bs.Length, 0); //发送消息
//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);//打印输出
}
catch(SocketException e)
{
Console.WriteLine("SocketException:{0}",e);//打印输出
}
}
}
}