C-Sharp网络编程案例解析（Socket类的使用）

Server端：

using System;

using System.Collections.Generic;

using System.Text;

using System.Net;

using System.Net.Sockets;

namespace Server

{

class Program

{

static void Main(string[] args)

{

//用于表示客户端发送的信息的长度

int recvLenth;

//用于缓存客户端所发送的信息，通过socket传递的信息必须为字节数组

byte[] data=new byte[1024];

//本机预使用的IP和端口

IPEndPoint iend = new IPEndPoint(IPAddress.Any,9999);

Socket newsock = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

newsock.Bind(iend);

newsock.Listen(10);

Console.WriteLine("waiting for a client !");

Socket client = newsock.Accept();

//当有可用的客户端连接尝试时执行，并返回一个新的socket，用于与客户端之间的通信

IPEndPoint clientAdd = (IPEndPoint)client.RemoteEndPoint;//获取远程终结点

Console.WriteLine("连接："+clientAdd.Address+"端口："+clientAdd.Port);//获取或设置终结点端口号

string welcome = "welcome here !";

data = Encoding.ASCII.GetBytes(welcome);

client.Send(data,data.Length,SocketFlags.None);//指定套接字的发送和接收行为

while(true)

{

data=new byte[1024];

recvLenth = client.Receive(data);

if(recvLenth==0)//信息长度为0，说明客户端连接断开

{

break;

}

Console.WriteLine(Encoding.ASCII.GetString(data,0,recvLenth));

client.Send(data,recvLenth,SocketFlags.None);

}

Console.WriteLine("断开连接"+clientAdd.Address);

client.Close();

newsock.Close();

}

}

}

Client端：

using System;

using System.Collections.Generic;

using System.Text;

using System.Net.Sockets;

using System.Net;

namespace Client

{

class Program

{

static void Main(string[] args)

{

byte[] data=new byte[1024];

Socket newclient = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

Console.WriteLine("输入服务器地址：");

string ipadd = Console.ReadLine();

Console.WriteLine();

Console.Write("输入服务器端口：");

int port = Convert.ToInt32(Console.ReadLine());

IPEndPoint ie = new IPEndPoint(IPAddress.Parse(ipadd),port);//服务器的ip和端口

try

{

//因为客户端只是用来向特定的服务器发送信息，所以不需要绑定本机的ip和端口，也不需要监听

newclient.Connect(ie);

}

catch(SocketException ex)

{

Console.WriteLine("不能连接");

Console.WriteLine(ex.ToString());

return;

}

int recv = newclient.Receive(data);

string stringdata = Encoding.ASCII.GetString(data,0,recv);

Console.WriteLine(stringdata);

while(true)

{

string input = Console.ReadLine();

if(input=="exit")

{

break;

}

newclient.Send(Encoding.Default.GetBytes(input));

data=new byte[1024];

recv = newclient.Receive(data);

stringdata = Encoding.Default.GetString(data,0,recv);

Console.WriteLine(stringdata);

}

Console.WriteLine("断开连接");

newclient.Shutdown(SocketShutdown.Both);

newclient.Close();

}

}

}