HTTP Server

import java.net.*;
import java.io.*;

public class WebServe
{
   static String getPath(String msg)
   {
      if (msg.length() == 0 || msg.substring(0,3) == "GET") return null;
      String path = msg.substring(msg.indexOf(' ')+1);
      path = path.substring(0, path.indexOf(' '));
      if (path.equals("")) return "index.html";
      if (path.charAt(path.length()-1) == '/') path += "index.html";
      return path;
   }

   static void fileFoundHeader(PrintStream os, int filelength)
   {
      os.print("HTTP:/1.0 200 OK\n");
      os.print("Content-type: text/html\n");
      os.print("Content-length: "+filelength+"\n");
      os.print("\n");
   }

   static void sendReply(PrintStream os, DataInputStream in, int flen)
   {
      try
      {
         byte buffer[] = new byte[flen];
         in.readFully(buffer);
         os.write(buffer, 0, flen);
         in.close();
      }
      catch (Exception e) { System.out.println(e);  }
   }

   static void errorHeader(PrintStream os, String err_message)
   {
      os.print("HTTP:/1.0 404 Not Found\n");
      os.print("Content-type: text/html\n");
      os.print("Content-length: "+err_message.length()+"\n");
      os.print("\n");
      os.print(err_message+"\n");
   }

   static File OpenFile(String filename)
   {
      File file = new File(filename);
      if (file.exists()) return file;
      if (filename.charAt(0) != '/') return file;
      return new File(filename.substring(1));
   }

   public static void main(String arg[])
   {
      String path, a;  DataInputStream in, is;  PrintStream os;
      try
      {
         ServerSocket server = new ServerSocket(8080);
         while (true)
         {
            Socket client = server.accept();
            String destname = client.getInetAddress().getHostName();
            System.out.println("Connect:"+client.getInetAddress());
            os = new PrintStream(client.getOutputStream());
            is = new DataInputStream(client.getInputStream());
            String il = is.readLine();
            System.out.println("Got:\t"+il);
            while (true)
            {
               a = is.readLine();
               if (a.equals("")) break;
               System.out.println("\t"+a);
            }
            System.out.println("----------------------------");
            if ((path = getPath(il)) != null)
            {
               File file = OpenFile(path);
               if (file.exists())
               {
                  try
                  {
                     in = new DataInputStream(new FileInputStream(file));
                     fileFoundHeader(os, (int)file.length());
                     sendReply(os, in, (int)file.length());
                  }
                  catch (Exception e) {
                     errorHeader(os, "< h2>Can't Read "+path+"< /h2>");
                  }
                  os.flush();
               }
               else
                  errorHeader(os, "< h2>Not Found "+path+"< /h2>");
            }
            client.close();
         }
      }
      catch (IOException e) { System.out.println(e); }
   }
}