Parsing out HTTP headers

Question

I'm writing a simple HTTP client and server. I'm looking for an efficent way to parse out the HTTP headers that the server sends. The code below is working for me at the moment but i don't think it's the correct way of going about it.
import java.io.*;
import java.net.*;
import java.util.*;
public final class RequestTEST {
    public static void main(String args[]) throws Exception
           final String CRLF ="\r\n";
           try {
               Socket mySocket = new Socket ("127.0.0.1", 5306 );
               DataOutputStream out = new DataOutputStream(mySocket.getOutputStream());
               InputStream in = mySocket.getInputStream();
               System.out.println("Enter a file name to request");
               String filename = Console.readString();
               String request = "GET /"+filename;
               System.out.println("Sending "+request);
               out.writeUTF( request );
               int bytes = 0;
               boolean header = true;
               while((bytes = in.read()) != -1 && header)
                    if(bytes==10) //Line Feed LF
                         bytes = in.read();
                         if (bytes==13) //Carriage return CR
                         header=false;
               System.out.println(bytes);
               in = mySocket.getInputStream();
               byte[] buffer = new byte[1024];
               FileOutputStream oStream = new FileOutputStream(filename);
               while((bytes = in.read(buffer)) != -1 )
               System.out.println(bytes);
            oStream.write(buffer, 0, bytes);
            oStream.close();
               mySocket.close ();
           catch (Exception exp ){
               exp.printStackTrace();
}I know the code is a little rough but i'm just developing the idea. Only started it today.
Any suggestions or tips on the overall approach to this would be much appreciated.

Answer 1

Maybe use the HttpURLConnection and then getHeaderFields().
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.HttpURLConnection;
public class URLTester
     private final static String PROTOCOL = "http://";
     public static void main(String args[])
          if ( args.length != 1 )
               System.out.println("Usage: java URLTester <url>");
               System.exit(-1);
          String urlString = args[0];
          try
               //  Create URL object from the URL string
               URL url = new URL(PROTOCOL + urlString);
               //  The connection object has information that may be
               //  retrieved without parsing the data returned
               HttpURLConnection conn = (HttpURLConnection)url.openConnection();
               conn.connect();
               //  Get an input stream from the URLConnection object
               InputStreamReader isr = new InputStreamReader( conn.getInputStream() );
               BufferedReader in = new BufferedReader( isr );
               System.out.println( conn.getHeaderField(0) );
               int headers = conn.getHeaderFields().size();
               for (int i = 1; i < headers; i++)
                    System.out.println(conn.getHeaderFieldKey(i)
                         + " : " + conn.getHeaderField(i));
               String line;
               while ( (line = in.readLine() ) != null )
                    System.out.println( line );
               in.close();
          catch(IOException e)
               System.out.println( e );
}