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FileDownload Component using from code

Hi experts! Is it possible to download file into client PC without using FileDownload UI component?

here inputstream code but how can I use ByteArrayInputStream to transfer to client?

 Reports reportItem = new Reports();
	          Map<String, Reports> map = new HashMap<String, Reports>();
	          map.put("report", reportItem);
	          XLSTransformer transformer = new XLSTransformer();
	          Workbook workbook = transformer.transformXLS(new FileInputStream(templateFile), map);
	          ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
	          return new ByteArrayInputStream(outputStream.toByteArray());
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