Java EE (i)--Developing a simple Web server

I. Introduction ofWeb development

Web Connection process ( b/s): The client uses the browser to send an HTTP request to the Web server and the server responds. Browser/server

HTTP request content:

The get/http/1.1 description is a GET request, using the http1.1 protocol.

Accept:image/gif ..... Description I can receive the image format has the following ...

ACCEPT-LANGUAGE:ZH-CN. It means that the language I can receive is Chinese.

User-agent:xxx shows that I can support the browser has XXX.

Host:www.baidu.com indicates that the host I want to access is www.baidu.com

Web Connection process ( c/s): The client (the client writes its own program) uses the TCP/IP protocol to send the request to the server and the server responds. Client/server

TCP/IP requests: In fact, the HTTP request is a wrapped TCP/IP request.

Ii. simulating the development of a Web server

1. First write an HTML file for display (placed in e:\\webtest/hello.html)

2. Write a mywebserver.java as follows:

import Java.io.BufferedReader;

import Java.io.FileReader;

import Java.io.OutputStream;

import Java.net.ServerSocket;

import Java.net.Socket;

Public class MyWebServer {

Public Static void Main (string[] args) throws exception{

TODO Auto-generated method stubs

ServerSocket ss=New serversocket (9999); Set port number 9999

System. out. println ("Wait for connection on port 9999 ..."); Wait for a request to send over

Socket s=ss.accept ();

System. out. println ("Successfully connected on port 9999 ...");

OutputStream Os=s.getoutputstream ();

BufferedReader br=New BufferedReader (new FileReader ("e:\\webtest/hello.html"));

String bfstring= "";

while ((Bfstring=br.readline ()) =null) {

Os.write (Bfstring.getbytes ());

}

Br.close ();

Os.close ();

S.close ();

}

}

3. After compiling and running this Java file, the browser enters http://localhost:9999/to display the page that was first written.

4. It is worth mentioning that if Mywebserver.java writes 80 ports, it can be accessed directly http://localhost.

5. Also, if you want multiple people to access this page at the same time, you need to change the code to

import Java.io.BufferedReader;

import Java.io.FileReader;

import Java.io.OutputStream;

import Java.net.ServerSocket;

import Java.net.Socket;

Public class MyWebServer {

Public Static void Main (string[] args) throws exception{

TODO Auto-generated method stubs

ServerSocket ss=New serversocket (9999); Set port number 9999

while (true) {

System. out. println ("Wait for connection on port 9999 ..."); Wait for a request to send over

Socket s=ss.accept ();

System. out. println ("Successfully connected on port 9999 ...");

OutputStream Os=s.getoutputstream ();

BufferedReader br=New BufferedReader (new FileReader ("e:\\webtest/hello.html"));

String bfstring= "";

while ((Bfstring=br.readline ()) =null) {

Os.write (Bfstring.getbytes ());

}

}

Br.close ();

Os.close ();

S.close ();

}

}

Java EE (i)--Developing a simple Web server