Re: How: convert byte[] to hex encoded string

gauravs_mailbox@yahoo.com wrote:


Another thought:

     static void loadFile (JFrameFileLoader jfl, File f)
     {
    JTextArea jta = jfl.getTextArea();

         if (f != null)
         {
        jfl.setFilename( f.getName () );
        jta.setText ( "" );
        FileChannel fc;
        try
        {
            fc = new FileInputStream (f).getChannel();
        } catch (FileNotFoundException ex)
        {
            jta.setText ("File not found.");
            return;
        }

        MappedByteBuffer mmf;
        try
        {
            mmf = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
        } catch (IOException ex)
        {
            jta.setText ("Error opening file.");
            return;
        }
        try
        {
        for (long i=0; i < fc.size(); i+=16)
        {
            jta.append ( myToHexString(i,8) );
            jta.append ( ": " );
            long lastBytes = fc.size () - i;
            for (long j=0; j < 16 && j < lastBytes; j++)
            {
            jta.append ( " " );
            jta.append( myToHexString(mmf.get (),2) );
            }
            jta.append ( "\n" );
        }
        } catch (IOException ex)
        {
            jta.setText ("Error reading file.");
            return;
        }
         }
     }

     static String myToHexString ( long n, int c )
     {
    String h= Long.toHexString ( n );
    while( h.length () < c)
    {
        h = "0" + h;
    }
    return h;
     }

     static String myToHexString( byte n, int c )
     {
    int temp = n;
    String h = Integer.toHexString ( 0xFF & temp);
    while(h.length ()<c)
        h = "0"+h;
    return h;
     }