C#
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;

namespace 保持程序最新服务端
{
    internal class Program
    {
        static System.Net.HttpListener httpListener = new HttpListener();
        static void Main(string[] args)
        {
            
            string IpAddress = "";
            string port = "";
            try
            {

                IpAddress= File.ReadAllText("set\\IpAddress.txt");
                port = File.ReadAllText("set\\port.txt");
            }
            catch (Exception ep)
            {
            }
            Console.WriteLine("IpAddress：" + IpAddress + "port：" + port);
            httpListener.AuthenticationSchemes = AuthenticationSchemes.Anonymous;
            httpListener.Prefixes.Add("http://" + IpAddress + ":"+port+"/");
            httpListener.Start();
            Thread thread = new Thread(HttpListen);
            thread.Start();
        }
        static public void HttpListen()
        {
            while (true)
            {
                Console.WriteLine("开始监听");
                HttpListenerContext httpListenerContext = httpListener.GetContext();
                new Thread(new ThreadStart(delegate
                {
                    try
                    {
                        using (StreamWriter writer = new StreamWriter(httpListenerContext.Response.OutputStream, Encoding.GetEncoding("GB2312")))
                        {
                            string urldata = httpListenerContext.Request.RawUrl.ToString();
                            HttpData httpData = new HttpData();
                            httpData.load(urldata);
                            httpListenerContext.Response.StatusCode = 200;
                            
                            if (httpData.cmd.Equals("chaxun"))
                            {
                                string sendtemp = "";
                                try
                                {
                                    string[] filelist = Directory.GetFiles("app\\"+ httpData.message+"\\");
                                    sendtemp = filelist[0];
                                }
                                catch(Exception e)
                                {

                                }
                               
                                send(writer, sendtemp);
                                Console.WriteLine("响应"+ httpData.message+ "的查询命令，结果是"+ sendtemp);
                            }
                            else if (httpData.cmd.Equals("download"))
                            {
                                string[] filelist = Directory.GetFiles("app\\" + httpData.message + "\\");
                                string filename = filelist[0];
                                byte[] sendtemp = File.ReadAllBytes(filename);
                                writer.BaseStream.Write(sendtemp, 0, sendtemp.Length);  
                                writer.Close();
                                // writer.Write(sendtemp);
                                Console.WriteLine("响应" + httpData.message + "的下载命令");
                            }
                            else
                            {
                                string sendtemp = "null";
                                send(writer, sendtemp);
                            }
                            writer.Close();
                        }
                    }
                    catch (Exception spe)
                    {

                    }
                    
                })).Start();
            }
        }
        static private void send(StreamWriter writer, string sendtemp)
        {
            try
            {

                writer.Write(sendtemp);
            }
            catch (Exception e)
            {

            }
        }
        static private void send(StreamWriter writer, byte[] sendtemp)
        {
            try
            {

                writer.Write(sendtemp);
            }
            catch (Exception e)
            {

            }
        }
    }
    class HttpData
    {
        public string cmd = "";
        public string message = "";
        public string date = "";
        public string name = "";

        public void load(string data)
        {
            string[] data_sp = data.Split('/');
            for (int cnt = 0; cnt < data_sp.Count(); cnt++)
            {
                switch (data_sp[cnt].Split('=')[0])
                {
                    case "cmd":
                        cmd = data_sp[cnt].Split('=')[1];
                        break;
                    case "message":
                        message = data_sp[cnt].Split('=')[1];
                        break;
                    case "date":
                        date = data_sp[cnt].Split('=')[1];
                        break;
                    case "name":
                        name = data_sp[cnt].Split('=')[1];
                        break;
                }
            }
        }
    }
}