HTTP服务器开发教程

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概述

最近因为项目需要，必须自己实现一个HTTP服务器的部分功能。

需求大概是这样的，winform里使用webrowser控件显示一个本地的html页面，同时winform启动http服务，本地html页面里通过javascript使用XMLHttpRequest对象向winform进行http通信，交互数据。

现在，该项目功能基本实现了，把HTTP服务器部分提取出来分享一下，并提供相关源码下载。

HTTP服务器开发教程

启动HTTP服务器代码，创建Socket侦听端口

        public void Start(string ip = "127.0.0.1", int port = 80)

        {

            _IP = ip;

            _Port = port;

            Stop();

            _Listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            IPAddress ipaddress = IPAddress.Parse(_IP);

            IPEndPoint endpoint = new IPEndPoint(ipaddress, _Port);

            _Listener.Bind(endpoint);

            _Listener.Listen(int.MaxValue);

            _Thread = new Thread(new ThreadStart(ThreadHandler));

            _Thread.Start();

        }

开启一个线程，接收请求的Socket，并且用HttpRequest对象封装处理请求的Socket

        private void ThreadHandler()

        {

            while (true)

            {

                Socket s = _Listener.Accept();

                HttpRequest request = new HttpRequest(this, s);

                request.Start();

            }

        }

每个HttpRequest开启一个新线程处理Socket的发送和接收

        public void Start()

        {

            _Thread = new Thread(new ThreadStart(ThreadHandler));

            _Thread.Start();

        }

 

        private void ThreadHandler()

        {

            if (_Server.TraceInConsole)

                Console.WriteLine("Begin HttpRequest...");

            try

            {

                while (true)

                {

                    string receive = Receive();

                    if (!string.IsNullOrEmpty(receive))

                    {

                        _Server.ReadRequest(this, receive);

 

                        string response = _Server.GetResponse(this);

                        int write = Send(response);

 

                        _Server.ResponseFinished(this);

 

                        while (true)

                        {

                            Thread.Sleep(3000);

                            write = Send(HttpServer.BYTES_CRLF);

                            if (_Client == null)

                                break;

                        }

                    }

                    if (_Client == null)

                        break;

                    Thread.Sleep(1000);

                }

            }

            catch (Exception ex)

            {

                if (_Server.TraceInConsole)

                    Console.WriteLine(ex.Message);

            }

            if (_Server.TraceInConsole)

                Console.WriteLine("End HttpRequest...");

        }

处理HTTP请求，默认是返回http404错误，在GetResponse添加自定义http处理

        public virtual string GetResponse(HttpRequest request)

        {

 

            return ResponeNotFound(request.Version);

        }

        public string ResponeNotFound(string version)

        {

            return version + @" 404 Not Found

Content-Length: 0

Content-Type: text/plain

Server: Hunk's http server

Date: Fri, 06 Aug 2010 14:00:23 GMT

 

";

        }

处理Socket关闭，TIME_WAIT状态

如果服务端的Socket比客户端的Socket先关闭，会导致客户端出现TIME_WAIT状态，占用系统资源。

服务端尝试发送数据，利用SocketExeception判断客户端Socket是否已关闭连接，然后关闭服务端Socket。

…

            while (true)

            {

                Thread.Sleep(3000);

                write = Send(HttpServer.BYTES_CRLF); //如果发送失败，_Client会被关闭并且设置为null

                if (_Server.TraceInConsole)

                    Console.WriteLine("Try To End HttpRequest...");

                if (_Client == null)

                    break;

            }

…

注：只提点主要的位置，详细请下载源码。

HTTP服务器和客户端的效果图

源码下载地址

http://download.youkuaiyun.com/source/2602863

 

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