我如何能够读取和写入不同扩展名 c# 的文件并显示它们

Question

我目前正在使用流读取器和写入器来读取文件并将其写入网页。目前 .html 文件正在工作，但 .jpg 和任何类型的图像都不会发布。

我如何能够提供像 mimetype 映射这样的文件？

namespace wdd_assign_07_github
{
    class Program
    {
     static void Main(string[] args)
        {
            //TcpListener server = null;

            if (args == null)
            {
                Console.WriteLine("args is null");

            }
            else if (args.Length != 3)
            {
                Console.WriteLine("Not enough arguments");
            }
            else
            {
                //do nothing
            }

            string webRoot = args[0].Substring(args[0].LastIndexOf("=") + 1);
            string webIP = args[1].Substring(args[1].LastIndexOf("=") + 1);
            string webPort = args[2].Substring(args[2].LastIndexOf("=") + 1);
            int numWebPort = Int32.Parse(webPort);
            Int32 port = numWebPort;

            TcpListener listener = new TcpListener(port);
            listener.Start();

            while (true)
            {
                //performing a blocking vall to accept requests
                Console.WriteLine("Waiting for a connection");
                TcpClient client = listener.AcceptTcpClient();

                StreamReader sr = new StreamReader(client.GetStream());
                StreamWriter sw = new StreamWriter(client.GetStream());

                try
                {
                    //client makes a request
                    //lets handle that request
                    string request = sr.ReadLine();

                    //lets print that out on our server console
                    Console.WriteLine(request);

                    //lets split that request
                    //[0]GET [1]PAGE [2]HTTPstring
                    string[] tokens = request.Split(' ');
                    string page = tokens[1];

                    //lets check if they requested the dedault page or not
                    if (page == "/")
                    {
                        page = "<H1>This is the default page</H1>";
                    }

                    //lets find the file now
                    StreamReader file = new StreamReader(webRoot + page);
                    sw.WriteLine("HTTP/1.0 200 OK\n");

                    //lets send the file
                    string data = file.ReadLine();

                    //while data doesnt equal null
                    while (data != null)
                    {
                        sw.WriteLine(data);
                        sw.Flush();
                        data = file.ReadLine();
                    }

                }
                catch (Exception e)
                {
                    //error
                    sw.WriteLine("HTTP/1.0 404 OK\n");
                    sw.WriteLine("<H1>SORRY! We couldnt find your file</H1>");
                    sw.Flush();
                }

                client.Close();
            }

        }
    }
}

Answer 1

您应该考虑多件事情：

• 包括Content-Type 和 Content-Length 标题。
• 使用字典定义内容类型

var mappings = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase) {
    {".jpg", "image/jpeg"},
    {".html", "text/html"},
    {".js", "application/javascript"},
    // ...
};

// later in your method
var ext = Path.GetExtension(page);
var contentType = mappings[ext]; // may throw if mapping is missing

• 使用FileStream 而不是StreamReader（至少对于像jpg和png这样的二进制文件）