使用TCP的HelloServer

時間 2019-11-11

原文原文鏈接

HelloServer是一個在1234端口監聽的服務端程序，它接受客戶送來的數據，而且把這些數據解釋爲響應的ASCII字符，再對客戶作出相似「Hello,...!"這樣的響應。如下是HelloServer的代碼。服務器

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

namespace HelloServer
{
    class Program
    {
        static void Main(string[] args)
        {
            string host = "localhost";
            IPAddress ip = Dns.Resolve(host).AddressList[0];
            int port = 1234;
            TcpListener lst = new TcpListener(ip,port);
            //開始監聽
            lst.Start();

            //進入等待客戶的無限循環
            while (true)
            {
                Console.Write("等待鏈接。。。。");
                TcpClient c = lst.AcceptTcpClient();

                Console.WriteLine("客戶已鏈接");
                NetworkStream ns = c.GetStream();
                //獲取客戶發來的數據
                byte [] request = new byte[512];
                int bytesRead = ns.Read(request, 0, request.Length);
                string input = Encoding.ASCII.GetString(request, 0, bytesRead);

                Console.WriteLine("客戶請求：{0}",input);
                
                //構造返回數據
                string output = "Hello, " + input + "!";
                byte[] hello = Encoding.ASCII.GetBytes(output);
                try
                {
                    ns.Write(hello,0,hello.Length);
                    ns.Close();
                    c.Close();
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.ToString());
                }
            }
            lst.Stop();
        }
    }
}

編譯以後運行，程序會顯示以下：spa

輸出結果code

等待鏈接。。。。blog

這時服務程序已經進入了等待鏈接的循環。若是不關閉控制檯端口，這個程序會一直等待。ip

如今編寫客戶端程序HelloClient，客戶端代碼以下input

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

namespace HelloClient
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                string host = "localhost";
                int port = 1234;
                TcpClient c = new TcpClient(host,port);
                NetworkStream ns = c.GetStream();
                //構造請求數據
                string output = "reader";
                byte[] name = Encoding.ASCII.GetBytes(output);
                ns.Write(name,0,name.Length);
                byte [] response = new byte[1024];
                //讀取服務器響應
                int bytesRead = ns.Read(response, 0, response.Length);
                Console.WriteLine(Encoding.ASCII.GetString(response,0,bytesRead));
                c.Close();
            }
            catch (Exception e)
            {
                
                Console.WriteLine(e.ToString());
            }
        }
    }
}