pub.file:readerToFile

fileName	String Fully qualified name of the file to which the data is to be written.
reader	java.io.Reader The reader object from which the data is read.
append	String Optional. Specifies whether to append to or overwrite the file if it already exists. The default behavior is to create a new file if the file does not exist or overwrite an existing file if the file already exists. Set to: true to append if the file already exists. false to overwrite if the file already exists.
encoding	String Optional. Name of a registered, IANA character set (for example, ISO-8859-1). If you specify an unsupported encoding, the system throws an exception. If no value is specified or if the encoding is set to autoDetect, the default operating system encoding is used.

For security reasons, the pub.file:readerToFile service checks the input fileName parameter against the list of allowedWritePaths values specified in the fileAccessControl.cnf file. If the input fileName is not on the allowed list, the service throws an exception. For information about configuring the fileAccessControl.cnf file, refer to File Access Control Configuration for the pub.file Services.