Quick excel export according to customized excel Title Template

According to custom excel Title Template quick excel export

try (InputStream fis = this.getClass().getResourceAsStream("/templates/ Templates .xlsx");
				XSSFWorkbook book = new XSSFWorkbook(fis);)
		{
    
			XSSFSheet sheet = book.getSheetAt(0);
			CellStyle style = createStyle(book);
			//  Build the data content of each row 
			int rowNum = 2;
			for (Iterator<Map<String, Object>> it = resultList.iterator(); it.hasNext();)
			{
    
				Map<String, Object> data = it.next();
				if (data == null) continue;
				//  Output row data 
				Row row = sheet.createRow(rowNum++);
				convertDataToRow(data, row, style);
			}
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			book.write(out);

			DownloadUtils.downLoadFile("excel.xlsx", response, out.toByteArray());
		}

/** *  Style centered  */
private CellStyle createStyle(XSSFWorkbook book)
	{
    
		CellStyle cellStyle = book.createCellStyle();

		cellStyle.setAlignment(HorizontalAlignment.CENTER);
		cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);

		cellStyle.setBorderBottom(BorderStyle.THIN);
		cellStyle.setBottomBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());

		cellStyle.setBorderTop(BorderStyle.THIN);
		cellStyle.setTopBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());

		cellStyle.setBorderLeft(BorderStyle.THIN);
		cellStyle.setLeftBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());

		cellStyle.setBorderRight(BorderStyle.THIN);
		cellStyle.setRightBorderColor(HSSFColor.HSSFColorPredefined.BLACK.getIndex());

		return cellStyle;
	}

/** *  Fill in the data  */
private void convertDataToRow(Map<String, Object> data, Row row, CellStyle style)
	{
    

		int cellNum = 0;
		Cell cell;
		// 
		cell = row.createCell(cellNum++);
		cell.setCellStyle(style);
		cell.setCellValue(null == data.get("username") ? "" : CommonFunc.parseStr(data.get("username")));
		// 
		cell = row.createCell(cellNum++);
		cell.setCellStyle(style);
		cell.setCellValue(null == data.get("age") ? "" : CommonFunc.parseStr(data.get("age")));		
	}



public class DownloadUtils {
    
    /** *  Download the file  * @param fileName * @param response * @param data * @throws IOException */
    public static void downLoadFile(String fileName, HttpServletResponse response, byte[] data) throws IOException {
    
        response.setContentType("application/vnd.ms-excel;charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        response.getOutputStream().write(data);
    }
}