本文档展示了如何使用C#编写一个简单的HTTP服务器，该服务器可以处理GET和POST请求。代码包括解析HTTP请求、读取头部信息以及处理GET和POST请求的方法。服务器在本地运行并监听8888端口，当接收到请求时，会返回一个JSON响应。对于POST请求，服务器读取请求体并将数据保存到内存流中。
/*
*
* C#实现了一个最简单的HTTP服务器类，你可以将它嵌入到自己的项目中，或者也可以阅读代码来学习关于HTTP协议的知识。
* 高性能的WEB应用一般都架设在强大的WEB服务器上，例如IIS, Apache, 和Tomcat。然而，HTML是非常灵活的UI标记语言，
* 也就是说任何应用和后端服务都可以提供HTML的生成支持。在这个小小的例子中，像IIS,、Apache这样的服务器消耗的资源太大了，
* 我们需要自己实现一个简单的HTTP服务器，将它嵌入到我们的应用中用来处理WEB请求。我们仅需要一个类就可以实现了，很简单。
*
*
* 如果你编译运行这个项目，你会在浏览器http://localhost:8888/地址下看到页面上生成的示例内容。让我们来简单看一下这个HTTP服务器引擎是怎么实现的。
*/
using System;
using System.Collections;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
namespace SimpleHttpServer
{
public class HttpProcessor
{
public TcpClient socket;
public HttpServer srv;
private Stream inputStream;
public StreamWriter outputStream;
public String http_method;
public String http_url;
public String http_protocol_versionstring;
public Hashtable httpHeaders = new Hashtable();
private static int MAX_POST_SIZE = 10 * 1024 * 1024; // 10MB
public HttpProcessor(TcpClient s, HttpServer srv)
{
this.socket = s;
this.srv = srv;
}
private string streamReadLine(Stream inputStream)
{
int next_char;
string data = "";
while (true)
{
next_char = inputStream.ReadByte();
if (next_char == '\n') { break; }
if (next_char == '\r') { continue; }
if (next_char == -1) { Thread.Sleep(1); continue; };
data += Convert.ToChar(next_char);
}
return data;
}
public void process()
{
// we can't use a StreamReader for input, because it buffers up extra data on us inside it's
// "processed" view of the world, and we want the data raw after the headers
inputStream = new BufferedStream(socket.GetStream());
// we probably shouldn't be using a streamwriter for all output from handlers either
outputStream = new StreamWriter(new BufferedStream(socket.GetStream()));
try
{
parseRequest();
readHeaders();
if (http_method.Equals("GET"))
{
handleGETRequest();
}
else if (http_method.Equals("POST"))
{
handlePOSTRequest();
}
}
catch (Exception e)
{
Console.WriteLine("Exception: " + e.ToString());
writeFailure();
}
outputStream.Flush();
// bs.Flush(); // flush any remaining output
inputStream = null; outputStream = null; // bs = null;
socket.Close();
}
public void parseRequest()
{
String request = streamReadLine(inputStream);
string[] tokens = request.Split(' ');
if (tokens.Length != 3)
{
throw new Exception("invalid http request line");
}
http_method = tokens[0].ToUpper();
http_url = tokens[1];
http_protocol_versionstring = tokens[2];
Console.WriteLine("starting: " + request);
}
public void readHeaders()
{
Console.WriteLine("readHeaders()");
String line;
while ((line = streamReadLine(inputStream)) != null)
{
if (line.Equals(""))
{
Console.WriteLine("got headers");
return;
}
int separator = line.IndexOf(':');
if (separator == -1)
{
throw new Exception("invalid http header line: " + line);
}
String name = line.Substring(0, separator);
int pos = separator + 1;
while ((pos < line.Length) && (line[pos] == ' '))
{
pos++; // strip any spaces
}
string value = line.Substring(pos, line.Length - pos);
Console.WriteLine("header: {0}:{1}", name, value);
httpHeaders[name] = value;
}
}
public void handleGETRequest()
{
srv.handleGETRequest(this);
}
private const int BUF_SIZE = 4096;
public void handlePOSTRequest()
{
// this post data processing just reads everything into a memory stream.
// this is fine for smallish things, but for large stuff we should really
// hand an input stream to the request processor. However, the input stream
// we hand him needs to let him see the "end of the stream" at this content
// length, because otherwise he won't know when he's seen it all!
Console.WriteLine("get post data start");
int content_len = 0;
MemoryStream ms = new MemoryStream();
if (this.httpHeaders.ContainsKey("Content-Length"))
{
content_len = Convert.ToInt32(this.httpHeaders["Content-Length"]);
if (content_len > MAX_POST_SIZE)
{
throw new Exception(
String.Format("POST Content-Length({0}) too big for this simple server",
content_len));
}
byte[] buf = new byte[BUF_SIZE];
int to_read = content_len;
while (to_read > 0)
{
Console.WriteLine("starting Read, to_read={0}", to_read);
int numread = this.inputStream.Read(buf, 0, Math.Min(BUF_SIZE, to_read));
Console.WriteLine("read finished, numread={0}", numread);
if (numread == 0)
{
if (to_read == 0)
{
break;
}
else
{
throw new Exception("client disconnected during post");
}
}
to_read -= numread;
ms.Write(buf, 0, numread);
}
ms.Seek(0, SeekOrigin.Begin);
}
Console.WriteLine("get post data end");
srv.handlePOSTRequest(this, new StreamReader(ms));
}
public void writeSuccess()
{
outputStream.WriteLine("HTTP/1.0 200 OK");
outputStream.WriteLine("Content-Type: text/html;charset=utf-8");
outputStream.WriteLine("Connection: close");
outputStream.WriteLine("");
}
public void writeFailure()
{
outputStream.WriteLine("HTTP/1.0 404 File not found");
outputStream.WriteLine("Connection: close");
outputStream.WriteLine("");
}
}
public abstract class HttpServer
{
protected int port;
TcpListener listener;
bool is_active = true;
public HttpServer(int port)
{
this.port = port;
}
public void listen()
{
listener = new TcpListener(port); //TcpListener(IPAddress localaddr, int port);
listener.Start();
while (is_active)
{
TcpClient s = listener.AcceptTcpClient();
HttpProcessor processor = new HttpProcessor(s, this);
Thread thread = new Thread(new ThreadStart(processor.process));
thread.Start();
Thread.Sleep(1);
}
}
public abstract void handleGETRequest(HttpProcessor p);
public abstract void handlePOSTRequest(HttpProcessor p, StreamReader inputData);
}
public class MyHttpServer : HttpServer
{
public MyHttpServer(int port) : base(port)
{
}
public override void handleGETRequest(HttpProcessor p)
{
Console.WriteLine("request: {0}", p.http_url);
p.writeSuccess();
string jsonstr = "{\"message\":\"ok\",\"nu\":\"367847964498\",\"ischeck\":\"1\",\"com\":\"shunfeng\",\"status\":\"200\",\"condition\":\"F00\",\"state\":\"3\",\"data\":[{\"time\":\"2020-02-18 16:03:48\",\"context\":\"查无结果\",\"ftime\":\"2020-02-18 16:03:48\"}]}";
p.outputStream.WriteLine("这是一个json数据");
p.outputStream.WriteLine(jsonstr);
//p.outputStream.WriteLine("
test server
");//p.outputStream.WriteLine("Current Time: " + DateTime.Now.ToString());
//p.outputStream.WriteLine("url : {0}", p.http_url);
//
//p.outputStream.WriteLine("
");//p.outputStream.WriteLine("");
//p.outputStream.WriteLine("");
//p.outputStream.WriteLine("
");}
public override void handlePOSTRequest(HttpProcessor p, StreamReader inputData)
{
Console.WriteLine("POST request: {0}", p.http_url);
string data = inputData.ReadToEnd();
p.outputStream.WriteLine("
test server
");p.outputStream.WriteLine("return
");
p.outputStream.WriteLine("postbody:
{0}", data);
}
}
class Program
{
static void Main(string[] args)
{
HttpServer httpServer;
if (args.GetLength(0) > 0)
{
httpServer = new MyHttpServer(Convert.ToInt16(args[0]));
}
else
{
httpServer = new MyHttpServer(8888);
}
Thread thread = new Thread(new ThreadStart(httpServer.listen));
thread.Start();
}
}
}
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