workbook.loadFromFile(inputFile);
//Fit to page
workbook.getConverterSetting().setSheetFitToPage(true);
//Set the maximum number of pages to convert
workbook.getConverterSetting().setMaxConvertPages();
//Save to PDF file
workbook.saveToFile(outputFile, FileFormat.PDF);
workbook.dispose(); 

//Create a Workbook object
Workbook workbook = new Workbook();
//Load a sample Excel file
workbook.loadFromFile("in.xlsx");
//Get the first worksheet
Worksheet sheet = workbook.getWorksheets().get(0);
//Create a CellStyle object
CellStyle fontStyle = workbook.getStyles().addStyle("headerFontStyle");
//Set the font color, size and style
fontStyle.getFont().setColor(Color.white);
fontStyle.getFont().isBold(true);
fontStyle.getFont().setSize(12);
fontStyle.setHorizontalAlignment(HorizontalAlignType.Center);
CellStyleFlag flag = new CellStyleFlag();
flag.setFontColor(true);
flag.setFontBold(true);
flag.setFontSize(true);
flag.setHorizontalAlignment(true);
//Apply style
sheet.getRange().get(1, 1, 1, 8).applyStyle(fontStyle, flag);
workbook.saveToFile("out.xlsx", ExcelVersion.Version2016);