TCP中首先要在服务端开启监听，这样才可以从客户端链接
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Collections;
using System.Net; namespace Server
{
class Program
{
static UdpClient server;
static ArrayList mblist;
//保存用户的
static Dictionary<string, IPEndPoint> dic = new Dictionary<string, IPEndPoint>();
static void AddMember(string nickNmae,IPEndPoint rep)//加入组
{
//mblist.Add(rep);
dic.Add(nickNmae,rep);
byte[] data = UDPComm.UDPComm.EncodingASCII(nickNmae+"已连接");
server.Send(data,data.Length,rep);
Console.WriteLine(nickNmae + "[" + rep.ToString() + "]" + "加入了组"); SendUserList();
//当用户更新后发送用户列表给所有用户
}
static void DelMember(IPEndPoint rep)//移除组
{
foreach (KeyValuePair<string, IPEndPoint> user in dic)
{
if (user.Value.Equals(rep))
{
byte[] data = UDPComm.UDPComm.EncodingASCII(user.Key + "退出了");
server.Send(data, data.Length, rep);
Console.WriteLine(user.Key + "[" + rep.ToString() + "]" + "退出了组");
dic.Remove(user.Key);
SendUserList();
break;//否则会报错，因为dic已经被修改
}
}
}
static void SendUserList()
{ string userlist = "UserList";
foreach (KeyValuePair<string, IPEndPoint> ss in dic)//取得所有用户
{
userlist += "|" + ss.Key;
} byte[] data = UDPComm.UDPComm.EncodingASCII(userlist);
foreach (KeyValuePair<string, IPEndPoint> ss in dic)//把用户表发给每个用户
{
server.Send(data, data.Length, ss.Value);
} }
static void SendToMember(IPEndPoint user,string message)//组类转发数据(第一个参数是谁发的，第二个是发的内容)
{
string name="";
foreach (KeyValuePair<string, IPEndPoint> ss in dic)//用来找出这个user的名字
{
if (ss.Value.Equals(user))//不能用"=="因为是两个不同的对象
{
name = ss.Key;//给要发送给各个客户端的信息加上发送人姓名；
//在服务端显示的信息
Console.WriteLine(name + "[" + user.ToString() + "]:" + message);
break;
}
}
foreach (KeyValuePair<string, IPEndPoint> d in dic)//循环给每个人都发送信息
{ byte[] data = UDPComm.UDPComm.EncodingASCII(name+" 说:"+message);
server.Send(data, data.Length, d.Value);
}
}
static void Main(string[] args)
{
IPAddress myIPAddress = (IPAddress)Dns.GetHostAddresses(Dns.GetHostName()).GetValue(2);
System.Console.Write(myIPAddress);
//string hostIP = "210.41.196.213";
string hostIP = myIPAddress.ToString();//
int port = 6666;
byte[] data;
string ReturnData;
IPEndPoint EndPoint;
IPAddress ipS = IPAddress.Parse(hostIP);//初始化本机
EndPoint = new IPEndPoint(ipS, port);
IPEndPoint test=null;//构造远程连接的参数
try
{
mblist = new ArrayList(); //server = new UdpClient(EndPoint);//创建本地连接的UdpClient实例
server = new UdpClient(6666);
Console.WriteLine("已启动,等待连接...");
while (true)
{
data = server.Receive(ref test);//接收数据,当Client端连接主机的时候，test就变成Cilent端的IP了 ReturnData = UDPComm.UDPComm.DecodingASCII(data); if (ReturnData.IndexOf("ADD") > -1)
{
string[] splitString = ReturnData.Split(',');//把从客户端发来的数据分开
string Command = splitString[0].Trim();
string name = splitString[1].ToLower();
AddMember(name,test); }
else if (ReturnData.IndexOf("DEL") > -1)
{
DelMember(test); }
else
{
if (dic.ContainsValue(test))//转发数据
{
SendToMember(test,ReturnData); }
}
}
}
catch (Exception e) { server.Close(); }
}
}
}
客户端
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Net;
using System.Threading; namespace Client
{
class Program
{
static string hostIP = "127.0.0.1";
static int port = 6666;
static UdpClient client;
byte[] data;
string sendData, ReturnData;
static IPEndPoint ipEnd;
IPEndPoint test = null;//用来在接收数据的时候对远程主机的信息存放
static void Main(string[] args)
{ IPAddress ipA = IPAddress.Parse(hostIP);//构造远程连接的参数
ipEnd = new IPEndPoint(ipA, port);
client = new UdpClient();// client = new UdpClient(ipEnd)这样的话就没有创建远程连接
client.Connect(ipEnd);//使用指定的远程主机信息建立默认远程主机连接 Thread threadReceive = new Thread(new ThreadStart(new Program().ReceiveData));
//threadReceive.IsBackground = true;
threadReceive.Start(); Thread threadSend = new Thread(new ThreadStart(new Program().SendData));
threadSend.Start();
}
public void SendData()
{
try
{
string first = string.Empty;
{
Console.WriteLine("请输入用户名");
sendData = "ADD," + Console.ReadLine().Trim();
data = UDPComm.UDPComm.EncodingASCII(sendData);//发送数据
client.Send(data, data.Length);
}
while (true)
{
sendData = Console.ReadLine();
if (sendData.IndexOf("DEL") > -1)
{
sendData = "DEL";
}
else if (sendData.IndexOf("QUIT") > -1)
{
data = UDPComm.UDPComm.EncodingASCII(sendData);//发送最后一次数据
client.Send(data, data.Length);
break;
} data = UDPComm.UDPComm.EncodingASCII(sendData);//发送数据
client.Send(data, data.Length); }
Console.WriteLine("退出");
client.Close(); }
catch (Exception e) { }
}
public void ReceiveData()
{
while (true)
{
data = client.Receive(ref test);//接收数据,
ReturnData = UDPComm.UDPComm.DecodingASCII(data);
Console.WriteLine(ReturnData);
}
}
}
}
上面就能够实现一个简单的聊天程序