C# Socket 通信

client 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Net.Sockets;
using System.Net;
using System.Diagnostics;

namespace CsocketClient
{
public partial class Main : Form
{
//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 socketclient = null;
public Main()
{
InitializeComponent();
StartPosition = FormStartPosition.CenterScreen;
//关闭对文本框的非法线程操作检查
TextBox.CheckForIllegalCrossThreadCalls = false;

this.btnSendMessage.Enabled = false;
this.btnSendMessage.Visible = false;

// this.txtDebugInfo.Visible = false;
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void btnConnection_Click(object sender, EventArgs e)
{
this.btnConnection.Enabled = false;
//定义一个套接字监听
socketclient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

//获取文本框中的IP地址
IPAddress address = IPAddress.Parse("127.0.0.1");

//将获取的IP地址和端口号绑定在网络节点上
IPEndPoint point = new IPEndPoint(address, 8098);

try
{
//客户端套接字连接到网络节点上，用的是Connect
socketclient.Connect(point);
this.btnSendMessage.Enabled = true;
this.btnSendMessage.Visible = true;
this.txtMessage.Visible = true;
}
catch (Exception)
{
Debug.WriteLine("连接失败\r\n");

this.txtDebugInfo.AppendText("连接失败\r\n");
return;
}

threadclient = new Thread(recv);
threadclient.IsBackground = true;
threadclient.Start();
}
// 接收服务端发来信息的方法
void recv()
{
int x = 0;
//持续监听服务端发来的消息
while (true)
{
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 = socketclient.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);
if (x == 1)
{
this.txtDebugInfo.AppendText("服务器:" + GetCurrentTime() + "\r\n" + strRevMsg + "\r\n\n");
Debug.WriteLine("服务器:" + GetCurrentTime() + "\r\n" + strRevMsg + "\r\n\n");
}
else
{
this.txtDebugInfo.AppendText(strRevMsg + "\r\n\n");
Debug.WriteLine(strRevMsg + "\r\n\n");
x = 1;
}
}
catch (Exception ex)
{
Debug.WriteLine("远程服务器已经中断连接" + "\r\n\n");
Debug.WriteLine("远程服务器已经中断连接" + "\r\n");
break;
}
}
}

//获取当前系统时间
DateTime GetCurrentTime()
{
DateTime currentTime = new DateTime();
currentTime = DateTime.Now;
return currentTime;
}

//发送字符信息到服务端的方法
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
socketclient.Send(arrClientSendMsg);
//将发送的信息追加到聊天内容文本框中
Debug.WriteLine("hello...." + ": " + GetCurrentTime() + "\r\n" + sendMsg + "\r\n\n");
this.txtDebugInfo.AppendText("hello...." + ": " + GetCurrentTime() + "\r\n" + sendMsg + "\r\n\n");
}

private void btnSendMessage_Click_1(object sender, EventArgs e)
{
//调用ClientSendMsg方法 将文本框中输入的信息发送给服务端
ClientSendMsg(this.txtMessage.Text.Trim());
this.txtMessage.Clear();
}
}
}

server

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.Net;
using System.Threading;

namespace Csocket
{
public class Program
{
// 创建一个和客户端通信的套接字
static Socket socketwatch = null;
//定义一个集合，存储客户端信息
static Dictionary<string, Socket> clientConnectionItems = new Dictionary<string, Socket> { };

public static void Main(string[] args)
{
//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）
socketwatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//服务端发送信息需要一个IP地址和端口号
IPAddress address = IPAddress.Parse("127.0.0.1");
//将IP地址和端口号绑定到网络节点point上
IPEndPoint point = new IPEndPoint(address, 8098);
//此端口专门用来监听的

//监听绑定的网络节点
socketwatch.Bind(point);

//将套接字的监听队列长度限制为20
socketwatch.Listen(20);

//负责监听客户端的线程:创建一个监听线程
Thread 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();

Console.WriteLine("开启监听。。。");
Console.WriteLine("点击输入任意数据回车退出程序。。。");
Console.ReadKey();
Console.WriteLine("退出监听，并关闭程序。");
}

//监听客户端发来的请求
static void watchconnecting()
{
Socket connection = null;

//持续不断监听客户端发来的请求
while (true)
{
try
{
connection = socketwatch.Accept();
}
catch (Exception ex)
{
//提示套接字监听异常
Console.WriteLine(ex.Message);
break;
}

//获取客户端的IP和端口号
IPAddress clientIP = (connection.RemoteEndPoint as IPEndPoint).Address;
int clientPort = (connection.RemoteEndPoint as IPEndPoint).Port;

//让客户显示"连接成功的"的信息
string sendmsg = "连接服务端成功！\r\n" + "本地IP:" + clientIP + "，本地端口" + clientPort.ToString();
byte[] arrSendMsg = Encoding.UTF8.GetBytes(sendmsg);
connection.Send(arrSendMsg);

//客户端网络结点号
string remoteEndPoint = connection.RemoteEndPoint.ToString();
//显示与客户端连接情况
Console.WriteLine("成功与" + remoteEndPoint + "客户端建立连接！\t\n");
//添加客户端信息
clientConnectionItems.Add(remoteEndPoint, connection);

//IPEndPoint netpoint = new IPEndPoint(clientIP,clientPort);
IPEndPoint netpoint = connection.RemoteEndPoint as IPEndPoint;

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

/// <summary>
/// 接收客户端发来的信息，客户端套接字对象
/// </summary>
/// <param name="socketclientpara"></param>
static 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
Console.WriteLine("客户端:" + socketServer.RemoteEndPoint + ",time:" + GetCurrentTime() + "\r\n" + strSRecMsg + "\r\n\n");

socketServer.Send(Encoding.UTF8.GetBytes("测试server 是否可以发送数据给client "));
}
catch (Exception ex)
{
clientConnectionItems.Remove(socketServer.RemoteEndPoint.ToString());

Console.WriteLine("Client Count:" + clientConnectionItems.Count);

//提示套接字监听异常
Console.WriteLine("客户端" + socketServer.RemoteEndPoint + "已经中断连接" + "\r\n" + ex.Message + "\r\n" + ex.StackTrace + "\r\n");
//关闭之前accept出来的和客户端进行通信的套接字
socketServer.Close();
break;
}
}
}

static DateTime GetCurrentTime()
{
DateTime currentTime = new DateTime();
currentTime = DateTime.Now;
return currentTime;
}
}
}