I am using XLSX2CSV example to parse large sheets from a workbook. Since I only need to output the data for specific sheets I added an if statement in the process method to test for the specific sheets. When the condition is met I continue with the process.

   public void process()
            throws IOException, OpenXML4JException, ParserConfigurationException, SAXException {

        ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(this.xlsxPackage);
        XSSFReader xssfReader = new XSSFReader(this.xlsxPackage);
        StylesTable styles = xssfReader.getStylesTable();
        XSSFReader.SheetIterator iter = (XSSFReader.SheetIterator) xssfReader.getSheetsData();

        while (iter.hasNext()) {
            InputStream stream = iter.next();
            String sheetName = iter.getSheetName();

            if (sheetName.equals("SHEET1")||sheetName.equals("SHEET2")||sheetName.equals("SHEET3")||sheetName.equals("SHEET4")||sheetName.equals("SHEET5")){           

            processSheet(styles, strings, stream);

            try {

                System.setOut(new PrintStream(
                        new FileOutputStream("C:\\Users\\edennis.AD\\Desktop\\test\\"+sheetName+".txt")));

            } catch (Exception e) {
                 e.printStackTrace();
            }


           stream.close();


            }
         }
    }

But I need to output text file and not sure how to do it. I tried to use the System.set() method to output everything from system.out to text but that's not working I just get blank files.