C# 使用Socket实现长链接和短连接

风吹花落伊人畔 · 发表于 2023-7-21 18:07:57

直接上代码
服务端：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
namespace SocketServer
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
private Socket _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
private byte[] _result = new byte[1024];
public MainWindow()
{
InitializeComponent();
}
private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
SocketService();
}
public void SocketService()
{
textBlock.Text += ("服务端已启动");
var host = "127.0.0.1";
var port = 5000;
_socket.Bind(new IPEndPoint(IPAddress.Parse(host), port));
_socket.Listen(10); // 设定最多10个排队连接请求
Task.Run(ListenClientConnect);
}
private void ListenClientConnect()
{
while (true)
{
var clientSocket = _socket.Accept();
clientSocket.Send(Encoding.UTF8.GetBytes("我是服务器"));
var receiveThread = new Thread(ReceiveMessage);
receiveThread.Start(clientSocket);
}
}
private void ReceiveMessage(object clientSocket)
{
Socket myClientSocket = (Socket)clientSocket;
while (true)
{
try
{
//通过clientSocket接收数据
int receiveNumber = myClientSocket.Receive(_result);
if (receiveNumber == 0)
return;
Application.Current.Dispatcher.Invoke(() =>
{
textBlock.Text += string.Format("接收客户端{0} 的消息：{1}", myClientSocket.RemoteEndPoint.ToString(), Encoding.UTF8.GetString(_result, 0, receiveNumber));
});
//给Client端返回信息
string sendStr = "已成功接到您发送的消息";
byte[] bs = Encoding.UTF8.GetBytes(sendStr);//Encoding.UTF8.GetBytes()不然中文会乱码
myClientSocket.Send(bs, bs.Length, 0); //返回信息给客户端
//myClientSocket.Close(); //发送完数据关闭Socket并释放资源//长连接的话就不关闭
//Console.ReadLine();
}
catch (Exception ex)
{
Application.Current.Dispatcher.Invoke(() =>
{
textBlock.Text += (ex.Message);
});
myClientSocket.Close();//关闭Socket并释放资源
//myClientSocket.Shutdown(SocketShutdown.Both);//禁止发送和上传
break;
}
}
}
}
}

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客户端：

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows;
namespace SocketClient
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
ShotLink("321");
// LongLink();
}
/// <summary>
/// 短连接，最后调用Close释放资源
/// </summary>
/// <param name="input"></param>
private void ShotLink(string input)
{
//设定服务器IP地址
IPAddress ip = IPAddress.Parse("127.0.0.1");
Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
clientSocket.Connect(new IPEndPoint(ip, 5000)); //配置服务器IP与端口
textBlock.Text += ("连接服务器成功");
}
catch
{
textBlock.Text += ("连接服务器失败！");
return;
}
string sendMessage = "你好";//发送到服务端的内容
clientSocket.Send(Encoding.UTF8.GetBytes(sendMessage));//向服务器发送数据，需要发送中文则需要使用Encoding.UTF8.GetBytes()，否则会乱码
textBlock.Text += ("向服务器发送消息：" + sendMessage);
//接受从服务器返回的信息
string recvStr = "";
byte[] recvBytes = new byte[1024];
int bytes;
bytes = clientSocket.Receive(recvBytes, recvBytes.Length, 0); //从服务器端接受返回信息
recvStr += Encoding.UTF8.GetString(recvBytes, 0, bytes);
textBlock.Text += string.Format("服务端发来消息：{0}", recvStr);//回显服务器的返回信息
//每次完成通信后，关闭连接并释放资源
clientSocket.Close();
Console.ReadLine();
}
/// <summary>
/// 长连接不调用Close释放资源
/// </summary>
private void LongLink()
{
//设定服务器IP地址
IPAddress ip = IPAddress.Parse("127.0.0.1");
Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
clientSocket.Connect(new IPEndPoint(ip, 5000)); //配置服务器IP与端口
textBlock.Text += ("连接服务器成功");
}
catch
{
textBlock.Text += ("连接服务器失败");
return;
}
//循环读取输入数据
while (true)
{
textBlock.Text += ("请输入");
string sentstr = "123";
SentMsg(sentstr, clientSocket);
Thread.Sleep(5000);
}
}
/// <summary>
/// 长连接，不释放资源
/// </summary>
/// <param name="sentstr"></param>
/// <param name="clientSocket"></param>
private void SentMsg(string sentstr, Socket clientSocket)
{
string sendMessage = "你好";//发送到服务端的内容
sendMessage = sentstr;//发送到服务端的内容
//向服务器发送数据，需要发送中文则需要使用Encoding.UTF8.GetBytes()，否则会乱码
clientSocket.Send(Encoding.UTF8.GetBytes(sendMessage));
textBlock.Text += ("向服务器发送消息：" + sendMessage);
//接受从服务器返回的信息
string recvStr = "";
byte[] recvBytes = new byte[1024];
int bytes;
bytes = clientSocket.Receive(recvBytes, recvBytes.Length, 0); //从服务器端接受返回信息
recvStr += Encoding.UTF8.GetString(recvBytes, 0, bytes);
textBlock.Text += string.Format("服务端发来消息：{0}", recvStr); //回显服务器的返回信息
//clientSocket.Close();//关闭连接并释放资源//如果是长连接，注释掉close
}
}
}

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来源:https://www.cnblogs.com/log9527blog/archive/2023/07/21/17572107.html
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