question: @ SuppressWarnings ( "ResultOfMethodCallIgnored" ) public static void pipeInputToOutputStream ( InputStream in , File fileOut , boolean ignoreErrors ) throws IOException { if ( fileOut == null ) { logger . error ( "The output filename doesn't exist or is invalid" ) ; if ( ! ignoreErrors ) { throw new IOException ( "The output filename doesn't exist or is invalid" ) ; } } else { File parent = fileOut . getParentFile ( ) ; if ( parent != null && ! parent . exists ( ) ) { parent . mkdirs ( ) ; } OutputStream fileStream = null ; try { fileStream = new FileOutputStream ( fileOut ) ; pipeInputToOutputStream ( in , fileStream , true , ignoreErrors ) ; } catch ( IOException e ) { if ( fileStream != null ) { try { fileStream . close ( ) ; } catch ( IOException ex ) { logger . error ( "Cannot close stream - {}" , ex . getMessage ( ) ) ; } } if ( ! ignoreErrors ) { throw e ; } } } }
target:  Convenient way of sending data from an input stream to an output file in the most efficient way possible