C#中使用Socket实现简单Web服务器

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

namespace socket_webServer
{
    class Program
    {
        static Socket _socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);  //侦听socket
        static string webRoot = @"C:\Users\jack\Desktop\";
        static string defaultPage = "index.html,home.html";

        static void Main(string[] args)
        {
            webRoot = @"C:\_jack\DevCode";
            _socket.Bind(new IPEndPoint(IPAddress.Any, 8080));
            _socket.Listen(100);
            _socket.BeginAccept(new AsyncCallback(OnAccept), _socket);  //开始接收来自浏览器的http请求（其实是socket连接请求）
            writeLog("Socket Web Server 已启动监听！" + Environment.NewLine + "  监听端口：" + ((IPEndPoint)_socket.LocalEndPoint).Port);
            Console.ReadKey();
        }

        /// 

        /// 接受处理http的请求
        /// 
        /// 
        static void OnAccept(IAsyncResult ar)
        {
            try
            {
                Socket socket = ar.AsyncState as Socket;
                Socket web_client = socket.EndAccept(ar);  //接收到来自浏览器的代理socket
                //NO.1  并行处理http请求
                socket.BeginAccept(new AsyncCallback(OnAccept), socket); //开始下一次http请求接收   （此行代码放在NO.2处时，就是串行处理http请求，前一次处理过程会阻塞下一次请求处理）

                byte[] recv_Buffer = new byte[1024 * 640];
                int recv_Count = web_client.Receive(recv_Buffer);  //接收浏览器的请求数据
                string recv_request = Encoding.UTF8.GetString(recv_Buffer, 0, recv_Count);
                writeLog("Data Request : " + recv_request);  //将请求显示到界面

                //Resolve(recv_request, web_client);  //解析、路由、处理

                byte[] cont = pageHandle(RouteHandle(recv_request));
                sendPageContent(cont, web_client);


                //NO.2  串行处理http请求
            }
            catch (Exception ex)
            {
                writeLog("处理http请求时出现异常！" + Environment.NewLine + "\t" + ex.Message);
            }
        }



        static void sendPageContent(byte[] pageContent, Socket response)
        {

            string statusline = "HTTP/1.1 200 OK\r\n";   //状态行
            byte[] statusline_to_bytes = Encoding.UTF8.GetBytes(statusline);

            string content =
            "" +
                "" +
                    "" +
                "" +
                "" +
                   "

" +
                       "欢迎您！" + "" + ",今天是 " + DateTime.Now.ToLongDateString() +
                   "
" +
                "" +
            "";  //内容


            byte[] content_to_bytes = pageContent;

            string header = string.Format("Content-Type:text/html;charset=UTF-8\r\nContent-Length:{0}\r\n", content_to_bytes.Length);
            byte[] header_to_bytes = Encoding.UTF8.GetBytes(header);  //应答头
            

            response.Send(statusline_to_bytes);  //发送状态行
            response.Send(header_to_bytes);  //发送应答头
            response.Send(new byte[] { (byte)‘\r‘, (byte)‘\n‘ });  //发送空行
            response.Send(content_to_bytes);  //发送正文（html）

            response.Close();

        }

        /// 

        /// 
        /// 
        /// 
        /// 
        static string RouteHandle(string request)
        {
            string retRoute = "";
            string[] strs = request.Split(new string[] { "\r\n" }, StringSplitOptions.None);  //以“换行”作为切分标志
            if (strs.Length > 0)  //解析出请求路径、post传递的参数(get方式传递参数直接从url中解析)
            {
                string[] items = strs[0].Split(‘ ‘);  //items[1]表示请求url中的路径部分（不含主机部分）
                string pageName = items[1];
                string post_data = strs[strs.Length - 1]; //最后一项
                //Dictionary dict = ParameterHandle(strs);

                retRoute = pageName + (post_data.Length > 0 ? "?" + post_data : "");
            }

            return retRoute;

        }


        /// 

        /// 按照HTTP协议格式,解析浏览器发送的请求字符串
        /// 
        /// 
        /// 
        static Dictionarystring, string> ParameterHandle(string[] strs)
        {
            Dictionarystring, string> param = new Dictionarystring, string>();

            if (strs.Length > 0)  //解析出请求路径、post传递的参数(get方式传递参数直接从url中解析)
            {
                if (strs.Contains(""))  //包含空行  说明存在post数据
                {
                    string post_data = strs[strs.Length - 1]; //最后一项
                    if (post_data != "")
                    {
                        string[] post_datas = post_data.Split(‘&‘);
                        foreach (string s in post_datas)
                        {
                            param.Add(s.Split(‘=‘)[0], s.Split(‘=‘)[1]);
                        }
                    }
                }
            }
            return param;
        }

        static byte[] pageHandle(string pagePath)
        {
            byte[] pageContent = null;
            webRoot = webRoot.TrimEnd(‘/‘, ‘\\‘);
            pagePath = pagePath.TrimEnd(‘/‘, ‘\\‘);
            if (pagePath.Length==0)
            {
                foreach (string page in defaultPage.Split(‘,‘))
                {
                    if (System.IO.File.Exists(webRoot + page))
                    {
                        pagePath = page;
                        break;
                    }
                }
            }
            if (System.IO.File.Exists(webRoot + pagePath))
                pageContent = System.IO.File.ReadAllBytes(webRoot + pagePath);
            if (pageContent == null)
            {

                string content = notExistPage();
                pageContent = Encoding.UTF8.GetBytes(content);

            }
            return pageContent;
        }


        static void writeLog(string msg)
        {
            Console.WriteLine("  " + msg);
        }


        static string notExistPage()
        {
            string cont = @"


    




            
This page can’t be displayed
            

                

Make sure the web address is correct.
                    
Look for the page with your search engine.
                    
Refresh the page in a few minutes.
                

Check that all network cables are plugged in.
                    
Verify that airplane mode is turned off.
                    
Make sure your wireless switch is turned on.
                    
See if you can connect to mobile broadband.
                    
Restart your router.
                

            
Fix connection problems
        
    
";

            return cont;
        }

    }
}