c# HttpListener 使用

與 IIS 上發布網站相比，使用 HttpListener 編程的程序更加輕量化，易於發布和更新。配合 Thread 或 Task 類也可滿足一定的並發。

https://docs.microsoft.com/zh-cn/dotnet/api/system.net.httplistener?view=netframework-4.7.2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Threading;
using System.IO;
//https://docs.microsoft.com/zh-cn/dotnet/api/system.net.httplistener?view=netframework-4.7.2

namespace WebServer
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                using (HttpListener listener = new HttpListener())
                {
                    listener.Prefixes.Add("http://localhost:8888/");
                    listener.Start();
                    Console.WriteLine("開始監聽");
                    while (true)
                    {
                        try
                        {
                            HttpListenerContext context = listener.GetContext();//阻塞
                            HttpListenerRequest request = context.Request;
                            string postData = new StreamReader(request.InputStream).ReadToEnd();
                            Console.WriteLine("收到請求：" + postData);
                            HttpListenerResponse response = context.Response;//響應
                            string responseBody = "響應";
                            response.ContentLength64 = System.Text.Encoding.UTF8.GetByteCount(responseBody);
                            response.ContentType = "text/html; Charset=UTF-8";
                            //輸出響應內容
                            Stream output = response.OutputStream;
                            using (StreamWriter sw = new StreamWriter(output))
                            {
                                sw.Write(responseBody);
                            }
                            Console.WriteLine("響應結束");
                        }
                        catch (Exception err)
                        {
                            Console.WriteLine(err.Message);
                        }
                    }
                }
            }
            catch (Exception err)
            {
                Console.WriteLine("程序異常，請重新打開程序：" + err.Message);
            }
        }
    }
}