教学小例子:简易的webSevrer

HttpListener 流利简单的API

static void Main()
    {
        using (var server = new SimpleWebServer("http://localhost:12345/", @"D:/webroot"))
        {

            Console.WriteLine("http服务开始监听......");

            server.Start();

            while (true)
            {
                var inStr = Console.ReadLine();

                Debug.Assert(inStr != null, "inStr != null");
                if (inStr.Equals("STOP", StringComparison.OrdinalIgnoreCase))
                {
                    break;
                }
                Console.WriteLine("输入 stop  可停止服务！");
            }
        }
    }



public class SimpleWebServer : IDisposable
    {

        private readonly HttpListener _httpListener;

        private readonly string _baseFolder;

        public SimpleWebServer(string uriPrefix, string baseFloder)
        {
            _httpListener = new HttpListener();
            _httpListener.Prefixes.Add(uriPrefix);
            _baseFolder = baseFloder;
        }


        public async void Start()
        {
            _httpListener.Start();

            while (true)
            {
                try
                {
                    var context = await _httpListener.GetContextAsync();
                    #pragma warning disable 4014
                    Task.Factory.StartNew(() =>{
                        PrcessRequestAsync(context);
                    });

                }
                catch (HttpListenerException exception)
                {
                    Console.WriteLine(exception);
                    break;
                }
                catch (InvalidOperationException exception)
                {
                    Console.WriteLine(exception);

                    break;
                }
            }
        }

        private async void PrcessRequestAsync(HttpListenerContext context)
        {
            try
            {
                string filename = Path.GetFileName(context.Request.RawUrl);

                // ReSharper disable once AssignNullToNotNullAttribute
                string path = Path.Combine(_baseFolder, filename);


                byte[] msg = new byte[0];
                if (File.Exists(path))
                {
                    if (context.Request.HttpMethod == "GET")
                    {
                        context.Response.StatusCode = (int) HttpStatusCode.OK;
                        msg = File.ReadAllBytes(path);
                    }
                    else if (context.Request.HttpMethod=="POST")
                    {
                        context.Response.StatusCode = (int)HttpStatusCode.Created;
                     
                    }
                    else
                    {
                        context.Response.StatusCode = (int) HttpStatusCode.HttpVersionNotSupported;
                    }


                }
                else
                {
                    Console.WriteLine($"资源不存在:{path}");

                    context.Response.StatusCode = (int) HttpStatusCode.NotFound;


                    msg = Encoding.Default.GetBytes(" ...你网址打错了... ");
                }

                context.Response.ContentLength64 = msg.Length;


                using (Stream s = context.Response.OutputStream)
                {
                    await s.WriteAsync(msg, 0, msg.Length);

                }
            }
            catch (Exception exception)
            {
                Console.WriteLine($"请求发生了错误:{exception}");
            }
        }

        public void Dispose()
        {
            _httpListener.Stop();
        }
    }

效果：