HTTP Server - Socket Program - Program and Tech

import java.net.*;
import java.io.*;
import java.util.*;
import java.lang.*;

class HttpRequest
{
    private Socket ClientConn;
    public HttpRequest(Socket ClientConn) throws Exception
    {
        this.ClientConn=ClientConn;
        
    }
    publicvoid process() throws Exception
    {
        DataInputStream din=new DataInputStream(ClientConn.getInputStream());
        
        OutputStream ot=ClientConn.getOutputStream();
        BufferedOutputStream out=new BufferedOutputStream(ot);

        String request=din.readLine().trim();
        System.out.println(request);
        StringTokenizer st=new StringTokenizer(request);
        
        String header=st.nextToken();
        
        if(header.equals("GET"))
        {
            String fileName=st.nextToken();
            FileInputStream fin=null;
            boolean fileExist=true;
            try
            {
                fin=new FileInputStream(fileName);
            }
            catch(Exception ex)
            {
                fileExist=false;
            }
            
            String ServerLine="Simple HTTP Server";
            String StatusLine=null;
            String ContentTypeLine=null;
            String ContentLengthLine=null;
            String ContentBody=null;
            
            if(fileExist)
            {
                StatusLine="HTTP/1.0 200 OK";
                ContentTypeLine="Content-type: text/html";
                ContentLengthLine="Content-Length: "+ (new Integer(fin.available()).toString());                
            }
            else
            {
                StatusLine = "HTTP/1.0 200 OK";
                ContentTypeLine="Content-type: text/html";
                ContentBody = "<HTML>" + 
                                "<HEAD><TITLE>404 Not Found</TITLE></HEAD>" +
                            "<BODY>404 Not Found" +                                               
                                "</BODY></HTML>" ;
                ContentLengthLine=(new Integer(ContentBody.length()).toString());
            }
            
            out.write(StatusLine.getBytes());
            out.write( ServerLine.getBytes());
            out.write(ContentTypeLine.getBytes());
            out.write( ContentLengthLine.getBytes());

            if(fileExist)    
            {

                byte[] buffer = newbyte[1024] ;
                int bytes = 0 ;
                while ((bytes = fin.read(buffer)) != -1 ) 
                    {
                    out.write(buffer, 0, bytes);
                    for(int iCount=0;iCount<bytes;iCount++)
                    {
                        int temp=buffer[iCount];
                        System.out.print((char)temp);
                    }
                }    
                
                fin.close();
            }
            else
            {
                out.write(ContentBody.getBytes());
            }

                            out.close();
                                ClientConn.close();

            
        }
        
    }
}
class HttpServer
{
    publicstaticvoid main(String args[]) throws Exception
    {
        ServerSocket soc=new ServerSocket(5217);
        while(true)
        {
            Socket inSoc=soc.accept();
            HttpRequest request=new HttpRequest(inSoc);
            request.process();
        }
        
        
    }
}
HTTP Server - Socket Program

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