C# TCP/IP 服务端 和 客户端

服务端
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Net.Sockets;
using System.Net;

namespace TcpIpServer
{
class TcpIpServerEx
{
public EndPoint RemoteEndPoint { get; private set; } //当前客户端的网络结点

Thread threadwatch = null;//负责监听客户端的线程
Socket socket = null;//负责监听客户端的套接字
// Dictionary<ip和端口, Socket> 定义一个集合，存储客户端信息
public Dictionary<EndPoint, Socket> dic = new Dictionary<EndPoint, Socket> { };

private StringBuilder msg = new StringBuilder();
public string Msg
{
get { return msg.ToString(); }
private set
{
msg.AppendLine(value);
Console.WriteLine(value + " ");
}

}

private TcpIpServerEx() { }
public TcpIpServerEx( int port=11000)
{
//定义一个套接字用于监听客户端发来的消息，包含三个参数（IP4寻址协议，流式连接，Tcp协议）
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

//将IP地址和端口号绑定到网络节点point上
IPEndPoint point = new IPEndPoint(IPAddress.Any, port);//设置服务器端口，IP是本程序所在PC的内网IP

//监听绑定的网络节点
socket.Bind(point);

//将套接字的监听队列长度限制为20
socket.Listen(20);

//创建一个监听线程
threadwatch = new Thread(watchconnecting);

//将窗体线程设置为与后台同步，随着主线程结束而结束
threadwatch.IsBackground = true;

//启动线程
threadwatch.Start();

//启动线程后显示相应提示
Msg = ("开始监听客户端传来的信息!" + " ");
}

//监听客户端发来的请求
private void watchconnecting()
{
Socket connection = null;
while (true) //持续不断监听客户端发来的请求
{
try
{
connection = socket.Accept();
}
catch (Exception ex)
{
Msg =(ex.Message); //提示套接字监听异常
break;
}

//让客户显示"连接成功的"的信息
string sendmsg = "连接服务端成功！你的IP是" + connection.RemoteEndPoint;
byte[] arrSendMsg = Encoding.UTF8.GetBytes(sendmsg);
connection.Send(arrSendMsg);


RemoteEndPoint = connection.RemoteEndPoint; //客户端网络结点号
Msg = ("成功与" + RemoteEndPoint + "客户端建立连接！ "); //显示与客户端连接情况
dic.Add(RemoteEndPoint, connection); //添加客户端信息


//创建一个通信线程
ParameterizedThreadStart pts = new ParameterizedThreadStart(recv);
Thread thread = new Thread(pts);
thread.IsBackground = true;//设置为后台线程，随着主线程退出而退出
thread.Start(connection);//启动线程
}
}

///
/// 接收客户端发来的信息
///
///客户端套接字对象
private void recv(object socketclientpara)
{

Socket socketServer = socketclientpara as Socket;
while (true)
{
//创建一个内存缓冲区 其大小为1024*1024字节 即1M
byte[] arrServerRecMsg = new byte[1024 * 1024];
//将接收到的信息存入到内存缓冲区,并返回其字节数组的长度
try
{
int length = socketServer.Receive(arrServerRecMsg);

//将机器接受到的字节数组转换为人可以读懂的字符串
string strSRecMsg = Encoding.UTF8.GetString(arrServerRecMsg, 0, length);

//将发送的字符串信息附加到文本框txtMsg上
Msg = ("客户端:" + GetCurrentTime() + socketServer.RemoteEndPoint +"的消息:"+ strSRecMsg + " ");
}
catch (Exception ex)
{
Msg = ("客户端:" + GetCurrentTime() + socketServer.RemoteEndPoint + "已经中断连接" + " "); //提示套接字监听异常
//listBoxOnlineList.Items.Remove(socketServer.RemoteEndPoint.ToString());//从listbox中移除断开连接的客户端
socketServer.Close();//关闭之前accept出来的和客户端进行通信的套接字
break;
}
}


}


//获取当前系统时间
private string GetCurrentTime()
{
string timeStr = System.DateTime.Now.ToString("yyyy年MM月dd日hh时mm分ss秒fff毫秒。");
return timeStr;
}

/// <summary>
/// 发送信息到客户端
/// </summary>
/// <param name="smallname"></param>
/// <param name="sendMsg">要发送的信息</param>
public void SentMsg(EndPoint endPoint,string sendMsg)
{

byte[] bytes = System.Text.Encoding.UTF8.GetBytes(sendMsg); //将要发送的信息转化为字节数组，因为Socket发送数据时是以字节的形式发送的
dic[endPoint].Send(bytes); //发送数据
Msg = (GetCurrentTime() + endPoint +"的消息:"+ sendMsg + " ");
}
}
}

using System;
namespace TcpIpServer
{
class Program
{
static void Main(string[] args)
{
TcpIpServerEx s =new TcpIpServerEx();
while (true)
{
string strSend = Console.ReadLine();
if (strSend == "exit") break;
Console.WriteLine("s.dic.Count:"+ s.dic.Count);
if (s.dic.Count >0)
{
s.SentMsg(s.RemoteEndPoint,strSend);
}
}
}
}
}
客户端
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Net.Sockets;
using System.Net;

namespace TcpIpClint
{
public class TcpIpClintEx
{
//创建 1个客户端套接字 和1个负责监听服务端请求的线程
Thread threadclient = null;
Socket socket = null;
List<IPEndPoint> mlist = new List<IPEndPoint>();
private StringBuilder msg = new StringBuilder();
public string Msg
{
get { return msg.ToString(); }
private set
{
msg.AppendLine(value);
Console.WriteLine(value + " ");
}
}

public TcpIpClintEx(string ip, int port = 11000)
{
//定义一个套接字监听
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//将获取的IP地址和端口号绑定在网络节点上
IPEndPoint point = new IPEndPoint(IPAddress.Parse(ip), port);
Msg = "正在连接服务器 " + ip + ":" + port;

try
{
//客户端套接字连接到网络节点上，用的是Connect
socket.Connect(point);
}
catch (Exception)
{
Msg = ("连接失败 ");
return;
}

threadclient = new Thread(recv);
threadclient.IsBackground = true;
threadclient.Start();
}

// 接收服务端发来信息的方法
private void recv()//
{
while (true)//持续监听服务端发来的消息
{
try
{
//定义一个1M的内存缓冲区，用于临时性存储接收到的消息
byte[] arrRecvmsg = new byte[1024 * 1024];

//将客户端套接字接收到的数据存入内存缓冲区，并获取长度
int length = socket.Receive(arrRecvmsg);

//将套接字获取到的字符数组转换为人可以看懂的字符串
string strRevMsg = Encoding.UTF8.GetString(arrRecvmsg, 0, length);

Msg = ("服务器:" + GetCurrentTime() + "IP:" + socket.RemoteEndPoint + ",的消息:" + strRevMsg + " ");
}
catch (Exception ex)
{
Msg = ("远程服务器已经中断连接" + " ");
break;
}
}
}

//获取当前系统时间
private string GetCurrentTime()
{
string timeStr = System.DateTime.Now.ToString("yyyy年MM月dd日hh时mm分ss秒fff毫秒。");
return timeStr;
}

//发送字符信息到服务端的方法
public void ClientSendMsg(string sendMsg)
{
//将输入的内容字符串转换为机器可以识别的字节数组
byte[] arrClientSendMsg = Encoding.UTF8.GetBytes(sendMsg);
//调用客户端套接字发送字节数组
socket.Send(arrClientSendMsg);
}
}
}
using System;
using System.Collections.Generic;
using System.Text;

namespace TcpIpClint
{
class Program
{
static void Main(string[] args)
{
TcpIpClintEx tcpIpClintEx =new TcpIpClintEx("122.112.226.109");

while (true)
{
string strSend = Console.ReadLine();
if (strSend == "exit") break;
tcpIpClintEx.ClientSendMsg(strSend);
}
}
}
}
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原文链接：https://blog.csdn.net/u013628121/article/details/82968706