Opens file list writer via this requestor.
@param compress if compress the file list
@return the file list
@throws IOException if failed to open the file list
@see #discardWriter()
The {@code Writer} returned will throw a {@link java.nio.charset.UnmappableCharacterException} if unmappable characters(ie: characters that do not exist in the specified encoding) are written to it.
Gets a Writer for this file object.
@return a Writer
@throws IllegalStateException if this file object wasopened for reading and does not support writing
@throws UnsupportedOperationException if this kind offile object does not support character access
@throws IOException if an I/O error occurred
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