自己实现简单Web服务器,支持GET POST请求

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

namespace WebConsole
{
    class Program
    {
        static HttpListener sSocket;
        static void Main(string[] args)
        {
            sSocket = new HttpListener();
            sSocket.Prefixes.Add("http://127.0.0.1:8080/");
            sSocket.Start();
            sSocket.BeginGetContext(new AsyncCallback(GetContextCallBack), sSocket);
            Console.WriteLine("已启动监听，访问http://127.0.0.1:8080/");
            Console.ReadKey();
        }
        
        static void GetContextCallBack(IAsyncResult ar)
        {
            try
            {
                sSocket = ar.AsyncState as HttpListener;
                HttpListenerContext context = sSocket.EndGetContext(ar);
                //再次监听请求
                sSocket.BeginGetContext(new AsyncCallback(GetContextCallBack), sSocket);
                //处理请求
                string a = Request(context.Request);
                //输出请求
                Response(context.Response, a);
            }
            catch { }
        }

        /// <summary>
        /// 处理输入参数
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        static string Request(HttpListenerRequest request)
        {
            string temp = "welcome to linezero!";
            if (request.HttpMethod.ToLower().Equals("get")) 
            {
                //GET请求处理
                if (!string.IsNullOrEmpty(request.QueryString["linezero"]))
                    temp = request.QueryString["linezero"];
            }
            else if (request.HttpMethod.ToLower().Equals("post")) 
            {
                //这是在POST请求时必须传参的判断默认注释掉
                //if (!request.HasEntityBody) 
                //{
                //    temp = "请传入参数";
                //    return temp;
                //}
                //POST请求处理
                Stream SourceStream = request.InputStream;
                byte[] currentChunk = ReadLineAsBytes(SourceStream);
                //获取数据中有空白符需要去掉，输出的就是post请求的参数字符串 如：username=linezero
                temp = Encoding.Default.GetString(currentChunk).Replace("", "");
            }            
            return temp;
        }

        static byte[] ReadLineAsBytes(Stream SourceStream)
        {
            var resultStream = new MemoryStream();
            while (true)
            {
                int data = SourceStream.ReadByte();
                resultStream.WriteByte((byte)data);
                if (data <= 10)
                    break;
            }
            resultStream.Position = 0;
            byte[] dataBytes = new byte[resultStream.Length];
            resultStream.Read(dataBytes, 0, dataBytes.Length);
            return dataBytes;
        }


        /// <summary>
        /// 输出方法
        /// </summary>
        /// <param name="response">response对象</param>
        /// <param name="responseString">输出值</param>
        /// <param name="contenttype">输出类型默认为json</param>
        static void Response(HttpListenerResponse response, string responsestring, string contenttype = "application/json")
        {
            response.StatusCode = 200;
            response.ContentType = contenttype;
            response.ContentEncoding = Encoding.UTF8;
            byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responsestring);
            //对客户端输出相应信息.
            response.ContentLength64 = buffer.Length;
            System.IO.Stream output = response.OutputStream;
            output.Write(buffer, 0, buffer.Length);
            //关闭输出流，释放相应资源
            output.Close();
        }
    }
}