InputStreamReader - skip Characters

Question

Hello!
I'm not to good in Java programming and need a little push.
My problem (the Java one): I have to read a ZIP file and copy/append it to a normal text file. THAT worked with the following code:
try {
   in  = new LineNumberReader(new InputStreamReader(new GZIPInputStream(new FileInputStream(inFile),cBufferSize)));
   out = new BufferedWriter( new FileWriter( p_outFileName ) );
   s   = in.readLine();
   while ( s != null ){
      iline++;
      out.write(p_laufdatum + "|" + s.trim() + "\n");
      s = in.readLine();
} catch ...Now an unwanted Character appeared (Ctrl-M, 0x0d) in some lines and messed the read lies up (broke them up). How can I suppress passing such a character to the readln method? I suspect I have to change the read() method of the InputStreamReader class ... but how?
Joachim

Answer 1

You could include a FilterReader or FilterInputStream. In these classes, you should overwrite the two read-methods such that all CTRL-M characters are skipped. The advantage of using such an Filter would that the reader of your code understands what is going on.
You should also think about where the CTRL-M characters come from. I think this is due to Windows-End-Of-Line marks which consist of a carriage return and a linefeed character. But LineNumberReader should accept this (hava a look at the documentation).