Java Socket Programming (v)

Programming a simple Web server





a simple Web server will be built from listing 9.2. Of course, the method and response events must also be improved. A simple server does not parse and store the request headers. The new Web server will analyze and store requests for future processing. In order to achieve this goal, You must have a class that contains HTTP requests.





HttpRequest class





Listing 9.5 Lists a complete HttpRequest class. This class must include all the information required by a request header.





list 9.5.HTTPrequest class.





import java.io.*;


import java.util.*;


import java.net.*;


import Namevalue;


/**


* This class has all the information for an HTTP request


*/


public class HttpRequest


{


public String version;


public String method;


public String file;


public Socket Clientsocket;


public DataInputStream Inbound;


public Namevalue headerpairs[];


/**


* Create an instance of this class


*/


public HttpRequest ()


{


version = NULL;


method = null;


file = null;


clientsocket = null;


inbound = null;


inbound = null;


headerpairs = new Namevalue[0];


}


/**


* Add a name/value pair to the core array


*/


public void Addnamevalue (string name, string value)


{


Try


{


namevalue temp[] = new namevalue[headerpairs.length + 1];


system.arraycopy (headerpairs, 0, temp, 0, headerpairs.length);


temp[Headerpairs.length] = new Namevalue (name, value);


headerpairs = temp;


}


catch (nullpointerexception NPE)


{


System.out.println ("nullpointerexception while adding Name-value:


"+ NPE);


}


}


/**


* returns this class in string form


*/


Public String toString ()


{


String s = method + "" + file + "" + version + \ n;


for (int x = 0; x < Headerpairs.length + +)


s + = headerpairs[x] + "\ n";


return s;


}


}




The
Namevalue class simply stores two strings: name and value. When a new pair is to be added, a new array is assigned. The new array accepts the old array and new members. The old array is then overwritten by a newly created object.