c# socket控制台程序
服务端
cs
using System;
using System.Text;
using System.Net.Sockets;
using System.Net;
namespace SocketMultiplayerGameServer
{
class Program
{
private static Socket listenSocket; // 重命名：明确是监听套接字
private static byte[] buffer = new byte[1024];
static void Main(string[] args)
{
try
{
// 初始化监听套接字
listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// 绑定任意IP + 6666端口，允许重复绑定（避免端口占用报错）
listenSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
listenSocket.Bind(new IPEndPoint(IPAddress.Any, 6666));
listenSocket.Listen(10); // 监听队列长度设为10（0不限制但不推荐）
Console.WriteLine("服务器启动，监听端口 6666...");
StartAccept(); // 开始接受客户端连接
Console.WriteLine("按任意键退出...");
Console.ReadKey();
// 程序退出时关闭监听套接字
listenSocket?.Close();
}
catch (Exception ex)
{
Console.WriteLine("服务器初始化失败：" + ex.Message);
}
}
// 异步接受客户端连接
static void StartAccept()
{
if (listenSocket == null || !listenSocket.IsBound) return;
try
{
listenSocket.BeginAccept(AcceptCallback, null);
}
catch (Exception ex)
{
Console.WriteLine("接受连接异常：" + ex.Message);
}
}
// 连接接受回调
static void AcceptCallback(IAsyncResult iar)
{
try
{
// 完成客户端连接接受
Socket client = listenSocket.EndAccept(iar);
if (client == null) return;
// 打印客户端信息
IPEndPoint clientEP = client.RemoteEndPoint as IPEndPoint;
Console.WriteLine($"客户端 {clientEP.Address}:{clientEP.Port} 连接成功");
// 开始接收该客户端的消息
StartReceive(client);
// 继续接受新的客户端连接
StartAccept();
}
catch (Exception ex)
{
Console.WriteLine("接受客户端连接异常：" + ex.Message);
// 异常后重新尝试监听
StartAccept();
}
}
// 异步接收客户端消息（关键修复：使用client而非listenSocket）
static void StartReceive(Socket client)
{
if (client == null || !client.Connected) return;
try
{
// 核心修复：调用客户端套接字的BeginReceive，而非监听套接字
client.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, ReceiveCallback, client);
}
catch (Exception ex)
{
Console.WriteLine("开始接收消息异常：" + ex.Message);
// 清理无效客户端连接
CloseClient(client);
}
}
// 接收消息回调
static void ReceiveCallback(IAsyncResult iar)
{
Socket client = iar.AsyncState as Socket;
if (client == null) return;
try
{
// 完成消息接收
int len = client.EndReceive(iar);
// len=0 表示客户端正常断开连接
if (len == 0)
{
IPEndPoint clientEP = client.RemoteEndPoint as IPEndPoint;
Console.WriteLine($"客户端 {clientEP.Address}:{clientEP.Port} 正常断开");
CloseClient(client);
return;
}
// 解析并打印客户端消息
string str = Encoding.UTF8.GetString(buffer, 0, len);
IPEndPoint clientIp = client.RemoteEndPoint as IPEndPoint;
Console.WriteLine($"收到 {clientIp.Address}:{clientIp.Port} 消息：{str}");
// 可选：回复客户端（测试用）
string replyMsg = "服务器已收到：" + str;
client.Send(Encoding.UTF8.GetBytes(replyMsg));
// 继续监听该客户端的下一条消息
StartReceive(client);
}
catch (SocketException ex)
{
// 捕获套接字异常（客户端异常断开、网络错误等）
IPEndPoint clientEP = client.RemoteEndPoint as IPEndPoint;
Console.WriteLine($"客户端 {clientEP?.Address}:{clientEP?.Port} 异常断开：{ex.Message}");
CloseClient(client);
}
catch (Exception ex)
{
Console.WriteLine("接收消息异常：" + ex.Message);
CloseClient(client);
}
}
// 关闭客户端连接（统一资源清理）
static void CloseClient(Socket client)
{
if (client == null) return;
try
{
if (client.Connected)
{
client.Shutdown(SocketShutdown.Both); // 关闭发送/接收
}
}
catch { }
finally
{
client.Close(); // 释放套接字资源
}
}
}
}客户端
cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Net.Sockets;
using System.Net;
using System;
using System.Text;
public class Client : MonoBehaviour
{
private Socket socket;//声明一个socket
private byte[] buffer = new byte[1024];
void Start()
{
try
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Connect("127.0.0.1", 6666);//连接服务端
StartReceive();
Send();
}
catch (Exception ex)
{
Debug.LogError("连接/发送失败：" + ex.Message);
}
}
void StartReceive()
{
// 增加空引用判断，避免异常
if (socket == null || !socket.Connected) return;
socket.BeginReceive(buffer, 0, buffer.Length, SocketFlags.None, ReceiveCallback, null);
}
void ReceiveCallback(IAsyncResult iar)
{
try
{
int len = socket.EndReceive(iar);
if (len == 0)
{
Debug.Log("服务端断开连接");
socket.Close();
return;
}
string str = Encoding.UTF8.GetString(buffer, 0, len);
Debug.Log("收到服务端消息：" + str);
StartReceive(); // 继续监听接收
}
catch (Exception ex)
{
Debug.LogError("接收消息异常：" + ex.Message);
}
}
void Send()
{
if (socket == null || !socket.Connected) return;
socket.Send(Encoding.UTF8.GetBytes("你好"));
}
void Update()
{
}
// 销毁时关闭Socket，避免资源泄漏
void OnDestroy()
{
socket?.Close();
socket = null;
}
}
