Simplest Web Server Case Analysis

In this case, some classes and methods are first listed one by one.
1. The IPAddress class is used to indicate an IP address.
1.1 IPAddress. Parse ("192.168.43.104") converts a string of IP addresses to IP addresses.
1.2 IPAddress. Loopback get the local Loopback address 127.0.0.1
2. The IPEndPoint class (endpoint) is a combination of IP addresses and ports (IP: Point). It uniquely identifies an application of a computer on the network.
IPEndPoint endPoint = new IPEndPoint (IPAddress. Parse ("192.168.43.104"), 8080); // creates a network endPoint whose IP address is 192.168.43.104 with port number 8080

2.1.1 Address: obtain or set the IP Address of the endPoint ex: endPoint. Address // 192.168.43.104
2.1.2 AddressFamily get network protocol ex: endPoint. AddressFamily // http
2.1.3 AddressPoint: Obtain the port number. ex: endPoint. Point // 8080

3. the Socket class is located in the System. Net. Socket namespace and encapsulates Socket operations.
3.1 set the Listen-based socket to enter the listening status and set the length of the waiting queue. Ex: socket. Listen (10) // only 10 clients are allowed to send requests simultaneously
3.2 Accept waits for a new connection. When the new connection arrives, a Socket object for the new connection is returned. That is, each client that establishes a connection has a Socket object on the server. Through this object, the client can communicate with the server. Ex: Socket client = socket. Accept ();
3.3 Receive uses Socket to accept byte data and saves it to one byte data. It returns an int type data (the actual number of bytes received ).
Ex: // create a buffer
Byte [] buffer = new byte [2048];
// Accept data
Int length = client. Receive (buffer, buffer. Length, SocketFlags. None );
3.4 "Send" indicates "send data". "Yes," Send "sends data pre-stored in the byte array through Socket.
The complete example code is as follows:
 
 
// Configure //----------------------------------------------------------------------------------------
IPEndPoint endPoint = new IPEndPoint (IPAddress. Parse ("192.168.43.104"), 8080 );
// Create a socket and use an ipv4 address. The transmission protocol is tcp, Which is bidirectional, reliable, and connection-based byte stream.
Socket socket = new Socket (AddressFamily. InterNetwork, SocketType. Stream, ProtocolType. Tcp );
// Bind it to an endpoint
Socket. Bind (endPoint );
// Set the length of the connection queue
Socket. Listen (10 );
Console. WriteLine ("start listening, Port: {0}", endPoint. Port );
While (true)
{
// Start listening. This method blocks thread execution until it receives connection requests from a client.
Socket client = socket. Accept ();
// Output client address
Console. WriteLine ("client address: {0}", client. RemoteEndPoint );
// Create a buffer
Byte [] buffer = new byte [2048];
// Accept data
Int length = client. Receive (buffer, buffer. Length, SocketFlags. None );
// Convert the request data to UTF-8
// Encoding utf8 = Encoding. UTF8;
String requestString = Encoding. UTF8.GetString (buffer, 0, length );
// Display the Request Message
Console. WriteLine (requestString );

// Response status line
String statusLine = "HTTP/1.1 200 OK \ r \ n ";
Byte [] statusLineBytes = Encoding. UTF8.GetBytes (statusLine );
// Prepare the webpage sent to the client
String responseBody = "Byte [] responseBodyBytes = Encoding. UTF8.GetBytes (responseBody );
// Response Header
String responseHeader = string. Format ("Content-type: text/html; charset = UTF-8 \ r \ nContent-Length: {0} \ r \ n", responseBody. Length );
Byte [] responseHeaderBytes = Encoding. UTF8.GetBytes (responseHeader );
Client. Send (statusLineBytes); // Send status information
Client. Send (responseHeaderBytes); // sends a Response Header
Client. Send (new byte [] {13, 10}); // split the line between the header and content
Client. Send (responseBodyBytes); // sends content

Client. Close (); // disconnect from the client

If (Console. KeyAvailable)
Break; // jump out of the endless loop

}
// Close the server
Socket. Close ();
 
 
Because the http protocol is stateless, the server automatically disconnects from the client every time the server completes one or more requests to keep the server's resources
Running result:
 
 
 
 



Source code http://www.bkjia.com/uploadfile/2012/0425/20120425090640204.rar
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