我是Telnet和C#的新手,我正在尝试创建一个简单的控制台程序.我需要一个启动的TCP侦听器,侦听传入的网络连接并发回响应.我并不真正关心传入的消息,但我需要接受它,以便客户认为连接成功.此TCP侦听器将以“Hello”响应.
我只需要确保它干净地启动并正常关闭TCP侦听器而不会抛出任何异常.我需要使用“Telnet localhost 9090”连接到端口9090上笔记本电脑上的TCP侦听器.
我只需要确保它干净地启动并正常关闭TCP侦听器而不会抛出任何异常.我需要使用“Telnet localhost 9090”连接到端口9090上笔记本电脑上的TCP侦听器.
你能帮我吗？
解决方法
使用
TCPListener类.该示例回应从第二组代码中提供的客户端发送给它的字符串,因此它发送响应Howdy.您可以在运行下面的客户端代码时对此进行测试,该代码调用Socket.Receive从服务器返回字符串：
using System;
using System.IO;
using System.Net;
using System.Net.sockets;
using System.Text;
namespace tcplistener
{
class Program
{
static void Main(string[] args)
{
TcpListener server = null;
try
{
Int32 port = 9090;
IPAddress localAddr = IPAddress.Parse("127.0.0.1");
server = new TcpListener(localAddr,port);
// Start listening for client requests.
server.Start();
// Buffer for reading data
Byte[] bytes = new Byte[256];
String data = null;
// Enter the listening loop.
while (true)
{
Console.Write("Waiting for a connection... ");
// Perform a blocking call to accept requests.
// You Could also user server.AcceptSocket() here.
TcpClient client = server.AcceptTcpClient();
Console.WriteLine("Hello!");
data = null;
// Get a stream object for reading and writing
NetworkStream stream = client.GetStream();
int i;
// Loop to receive all the data sent by the client.
while ((i = stream.Read(bytes,bytes.Length)) != 0)
{
// Translate data bytes to a ASCII string.
data = System.Text.Encoding.ASCII.GetString(bytes,i);
Console.WriteLine("Received: {0}",data);
// Process the data sent by the client.
data = data.toupper();
byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);
// Send back a response.
stream.Write(msg,msg.Length);
Console.WriteLine("Sent: {0}",data);
}
// Shutdown and end connection
client.Close();
}
}
catch (SocketException e)
{
Console.WriteLine("SocketException: {0}",e);
}
finally
{
// Stop listening for new clients.
server.Stop();
}
Console.WriteLine("\nHit enter to continue...");
Console.Read();
}
}
}
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.sockets;
using System.Text;
using System.Threading.Tasks;
namespace tcpconnect
{
class Program
{
static void Main(string[] args)
{
Connect1("127.0.0.1",9090);
Console.Read();
}
// Synchronous connect using IPAddress to resolve the
// host name.
public static void Connect1(string host,int port)
{
IPAddress[] IPs = Dns.GetHostAddresses(host);
Socket s = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
Console.WriteLine("Establishing Connection to {0}",host);
s.Connect(IPs[0],port);
byte[] howdyBytes = Encoding.ASCII.GetBytes("Howdy");
s.Send(howdyBytes);
byte[] buffer = new byte[50];
s.Receive(buffer);
Console.Write(Encoding.ASCII.GetString(buffer));
Console.WriteLine("Connection established");
}
}
}