Confirmation

///////    FileServer.java    ///////
import java.io.*;
import java.net.*;
import java.util.StringTokenizer;

public class FileSaver
{
   public static void main (String[] args)
                throws IOException
   {
       String filename, rw, dir = "/tmp/";
       if ( args.length != 2 ) return;
       filename = args[0];
       rw = args[1];
       if ( rw.equals("r") )
       {    readBack(dir + filename); return; }
       else
       {    writeTo(dir + filename); return;  }
   }

   static void readBack(String file)
              throws IOException
   {   int c;
       FileInputStream infile = new FileInputStream(file);
       // Sending a stream of bytes
       System.out.println("Content-Type: application/octet-stream");
       System.out.println();  // empty line
       while (  (c = infile.read() ) > -1 )
             System.out.write(c);
   }
   

   static void writeTo(String file)
              throws IOException
   {   int c;
       FileOutputStream ofile = new FileOutputStream(file);
       while (  (c = System.in.read() ) > -1 )
             ofile.write(c);
       // confirmation
       System.out.println("Content-Type: text/html");  // 1st line
       System.out.println();                           // empty line
       System.out.println("<html><H1> Confirmation </H1>");
       System.out.println("<P>Your" +file+ " has been saved </P></html>");
   }
}