c# HttpServer 的使用

 

在很多的時候，我們寫的應用程序需要提供一個信息說明或者告示功能，希望借助於HttpServer來發布一個簡單的網站功能，但是又不想架一個臃腫的Http服務器功能，

這時候，標准框架提供的HttpServer功能或許是我們的選擇。

一引入using System.Net;

二開始服務

 1  public class ServerHelper
 2     {
 3         HttpListener httpListener = new HttpListener();
 4         public void Setup(int port=8080)
 5         {            
 6             httpListener.AuthenticationSchemes = AuthenticationSchemes.Anonymous;
 7             httpListener.Prefixes.Add(string.Format("http://*:{0}/",port));//如果發送到8080 端口沒有被處理，則這里全部受理，+是全部接收
 8             httpListener.Start();//開啟服務
 9 
10             Receive();//異步接收請求
11         }
12 
13         private void Receive()
14         {
15             httpListener.BeginGetContext(new AsyncCallback(EndReceive), null);
16         }
17 
18         void EndReceive(IAsyncResult ar)
19         {
20             var context = httpListener.EndGetContext(ar);
21             Dispather(context);//解析請求
22             Receive();
23         }
24 
25         RequestHelper RequestHelper;
26         ResponseHelper ResponseHelper;
27         void Dispather(HttpListenerContext context)
28         {
29             HttpListenerRequest request= context.Request;
30             HttpListenerResponse response = context.Response;
31             RequestHelper = new RequestHelper(request);
32             ResponseHelper = new ResponseHelper(response);
33             RequestHelper.DispatchResources(fs => {
34                 ResponseHelper.WriteToClient(fs);// 對相應的請求做出回應
35             });
36         }
37     }

三解析請求

 1 public class RequestHelper
 2     {
 3         private HttpListenerRequest request;
 4         public RequestHelper(HttpListenerRequest request)
 5         {
 6             this.request = request;
 7         }
 8         public Stream RequestStream { get; set; }
 9         public void ExtracHeader()
10         {
11             RequestStream= request.InputStream;
12         }
13 
14         public delegate void ExecutingDispatch(FileStream fs);
15         public void DispatchResources(ExecutingDispatch action)
16         {
17             var rawUrl = request.RawUrl;//資源默認放在執行程序的wwwroot文件下，默認文檔為index.html
18             string filePath = string.Format(@"{0}/wwwroot{1}", Environment.CurrentDirectory, rawUrl);//這里對應請求其他類型資源，如圖片，文本等
19             if (rawUrl.Length==1)
20                filePath = string.Format(@"{0}/wwwroot/index.html", Environment.CurrentDirectory);//默認訪問文件
21             try {
22             if (File.Exists(filePath))
23             {
24                     FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);
25                 
26                     action?.Invoke(fs);
27                 
28             }
29             }
30             catch { return; }
31         }
32         public void ResponseQuerys()
33         {
34             var querys = request.QueryString;
35             foreach (string key in querys.AllKeys)
36             {
37                 VarityQuerys(key,querys[key]);
38             }
39         }
40 
41         private void VarityQuerys(string key,string value)
42         {
43             switch(key)
44             {
45                 case "pic":Pictures(value); break;
46                 case "text":Texts(value); break;
47                 default:Defaults(value); break;
48             }
49         }
50 
51         private void Pictures(string id)
52         {
53 
54         }
55 
56         private void Texts(string id)
57         {
58 
59         }
60 
61         private void Defaults(string id)
62         {
63 
64         }
65 
66     }

四回應請求

public class ResponseHelper
    {
        private HttpListenerResponse response;
        public ResponseHelper(HttpListenerResponse response)
        {
            this.response = response;
            OutputStream = response.OutputStream;
           
        }
        public Stream OutputStream { get; set; }
        public class FileObject
        {
            public FileStream fs;
            public byte[] buffer;
        }
        public void WriteToClient(FileStream fs)
        {
            response.StatusCode = 200;
            byte[] buffer = new byte[1024];
            FileObject obj = new FileObject() { fs = fs, buffer = buffer };      
            fs.BeginRead(buffer, 0, buffer.Length, new AsyncCallback(EndWrite), obj);
        }       
        void EndWrite(IAsyncResult ar)
        {
            var obj = ar.AsyncState as FileObject;
            var num= obj.fs.EndRead(ar);
            OutputStream.Write(obj.buffer,0,num);
            if (num < 1) { 
　　　　　　　　　　obj.fs.Close(); //關閉文件流
　　　　　　　　　　OutputStream.Close();//關閉輸出流，如果不關閉，瀏覽器將一直在等待狀態
 　　　　　　　　　　return; 
　　　　　　　　}
            obj.fs.BeginRead(obj.buffer, 0, obj.buffer.Length, new AsyncCallback(EndWrite), obj);
        }
    }

測試結果：

准備的index.html,里面包含了圖片和普通html

資源目錄：

 

 

 瀏覽器進行訪問測試：

總結：

本文只是對httpserver進行簡單的測試，簡單的進行請求和回應的梳理，對於想要復雜的瀏覽器功能，需要詳細的研究下其他瀏覽器的工作原理