Flushes this output stream and forces any buffered output bytes
to be written out to the stream.
<p>
The <code>flush</code> method of <code>FilterOutputStream</code>
calls the <code>flush</code> method of its underlying output stream.
@exception IOException if an I/O error occurs.
@see java.io.FilterOutputStream#outputStream
Flushes this output stream and forces any buffered output bytes to be written out to the stream. <p> The <code>flush</code> method of <code>FilterOutputStream</code> calls the <code>flush</code> method of its underlying output stream.
@exception IOException if an I/O error occurs. @see java.io.FilterOutputStream#outputStream