jexcelapi导出excel

WritableWorkbook book = Workbook.createWorkbook(new File(inputFile));
        
        WritableSheet sheet = book.createSheet(inputFile, 0);
        
        sheet.setName(fileName);
        
//        WritableFont tf = new WritableFont(WritableFont.TIMES, 16, WritableFont.BOLD);
//        WritableCellFormat cf = new WritableCellFormat(tf);
//        cf.setBackground(Colour.GRAY_25);
////        cf.setAlignment(Alignment.CENTRE);
////        cf.setVerticalAlignment(VerticalAlignment.CENTRE);
//        Label label = new Label(0, 0, fileName, cf);
////        label.setCellFormat(cf);
//        sheet.addCell(label);
//        sheet.mergeCells(0, 0, 40, 0);
//        sheet.setRowView(0, 400);
        
        
        
//        WritableCell newCell = new
        
        book.write();
        book.close();

//生成excel文件
    public FileTransfer downloadExcel(String fileName) throws Exception {
        
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        WritableWorkbook book = Workbook.createWorkbook(buffer);
//        WritableWorkbook book = Workbook.createWorkbook(new File(reportCode));
        WritableSheet sheet = book.createSheet(fileName, 0);
        sheet.setName(fileName);
//        book.write();
//        book.g
//        book.close();
        return new FileTransfer(fileName + ".xls", "application/vnd.ms-excel", buffer.toByteArray());
    }