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下面是个简单的例子,实现客户端和服务器在外网情况下通讯
建立通讯过程:
1.下载花生壳,开通内网穿透功能(体验版6元),它会分配一个公网ip和一个端口号,如下图
2.利用花生壳将存在服务器程序机器的内网映射至外网,如下图
3.服务器启动程序,ip为内网,端口为花生壳分配的公网端口。
4.客户端去连接公网ip,端口为公网端口
C#测试代码如下:
服务器:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace Csharp_socket编程_TCP协议
{
class Program
{
private static byte[] result = new byte[1024];
private static int myProt = 38688; //端口
static Socket serverSocket;
static void Main(string[] args)
{
//服务器IP地址
IPAddress ip = IPAddress.Parse("192.168.10.85");
serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
serverSocket.Bind(new IPEndPoint(ip, myProt)); //绑定IP地址:端口
serverSocket.Listen(10); //设定最多10个排队连接请求
Console.WriteLine("启动监听{0}成功", serverSocket.LocalEndPoint.ToString());
//通过Clientsoket发送数据
Thread myThread = new Thread(ListenClientConnect);
myThread.Start();
Console.ReadLine();
}
/// <summary>
/// 监听客户端连接
/// </summary>
private static void ListenClientConnect()
{
while (true)
{
Socket clientSocket = serverSocket.Accept();
clientSocket.Send(Encoding.ASCII.GetBytes("Server Say Hello"));
Thread receiveThread = new Thread(ReceiveMessage);
receiveThread.Start(clientSocket);
}
}
/// <summary>
/// 接收消息
/// </summary>
/// <param name="clientSocket"></param>
private static void ReceiveMessage(object clientSocket)
{
Socket myClientSocket = (Socket)clientSocket;
while (true)
{
try
{
//通过clientSocket接收数据
int receiveNumber = myClientSocket.Receive(result);
Console.WriteLine("接收客户端{0}消息{1}", myClientSocket.RemoteEndPoint.ToString(), Encoding.ASCII.GetString(result, 0, receiveNumber));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
myClientSocket.Shutdown(SocketShutdown.Both);
myClientSocket.Close();
break;
}
}
}
}
}
客户端:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace Csharp_socket编程_TCP协议_客户端
{
class Program
{
private static byte[] result = new byte[1024];
static void Main(string[] args)
{
//设定服务器IP地址
IPAddress ip = IPAddress.Parse("103.46.128.45");
Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
clientSocket.Connect(new IPEndPoint(ip, 38688)); //配置服务器IP与端口
Console.WriteLine("连接服务器成功");
}
catch
{
Console.WriteLine("连接服务器失败,请按回车键退出!");
return;
}
//通过clientSocket接收数据
int receiveLength = clientSocket.Receive(result);
Console.WriteLine("接收服务器消息:{0}", Encoding.ASCII.GetString(result, 0, receiveLength));
//通过 clientSocket 发送数据
try
{
Thread.Sleep(1000); //等待1秒钟
string sendMessage = "client send Message Hellp" + DateTime.Now;
clientSocket.Send(Encoding.ASCII.GetBytes(sendMessage));
Console.WriteLine("向服务器发送消息:{0}" + sendMessage);
}
catch
{
clientSocket.Shutdown(SocketShutdown.Both);
clientSocket.Close();
}
Console.WriteLine("发送完毕,按回车键退出");
Console.ReadLine();
}
}
}
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