1.将一个excel文件的样式复制到另一个excel

Workbook wb = WorkbookFactory.create(new File("existing.xls"));
CellStyle origStyle = wb.getCellStyleAt(1); // Or from a cell

Workbook newWB = new XSSFWorkbook();
Sheet sheet = newWB.createSheet();
Row r1 = sheet.createRow(0);
Cell c1 = r1.createCell(0);

CellStyle newStyle = newWB.createCellStyle();
newStyle.cloneStyleFrom(origStyle);
c1.setCellStyle(newStyle);

newWB.write(new FileOutpuStream("new.xlsx"));

2.给某一列添加筛选功能

Sheet sheetCreat = wbCreat.createSheet(sheet.getSheetName());
                CellRangeAddress c = CellRangeAddress.valueOf(CELL_RANGE_ADDRESS);
                sheetCreat.setAutoFilter(c);

3.给某一列添加取值的校验（限制某一列只能取某些值）

/**
     * <给某一列添加取值的校验（限制某一列只能取某些值）>
     *
     * @param sheet    sheet
     * @param firstRow firstRow
     * @param firstCol firstCol
     * @param endRow   endRow
     * @param endCol   endCol
     * @param strList  strList
     * @return
     * @throws
     */
    private static HSSFDataValidation getDataValidationList(HSSFSheet sheet, short firstRow,
                                                            short firstCol, short endRow,
                                                            short endCol, List<String> strList)
    {
        String[] dataArray = strList.toArray(new String[0]);
        HSSFDataValidationHelper dvHelper = new HSSFDataValidationHelper(sheet);
        DataValidationConstraint dvConstraint = (DataValidationConstraint)dvHelper
            .createExplicitListConstraint(dataArray);
        CellRangeAddressList addressList = new CellRangeAddressList(firstRow, endRow, firstCol,
            endCol);
        HSSFDataValidation validation = (HSSFDataValidation)dvHelper.createValidation(dvConstraint,
            addressList);
        return validation;
    }

if (!CollectionUtils.isEmpty(dataList))
                {
                    HSSFDataValidation dataValidation4List = getDataValidationList(
                        (HSSFSheet)sheetCreat, (short)0, (short)3, (short)1000, (short)3,
                        dataList);
                    if (null != dataValidation4List)
                    {
                        sheetCreat.addValidationData(dataValidation4List);
                    }
                }

4.数据验证-某列保证唯一性

/**
     * <数据验证-某列保证唯一性>
     *
     * @param sheet    sheet
     * @param firstRow firstRow
     * @param firstCol firstCol
     * @param endRow   endRow
     * @param endCol   endCol
     * @param formula  excel校验规则
     * @return
     * @throws
     */
    private static HSSFDataValidation getDataValidationCustomFormula(HSSFSheet sheet,
                                                                     short firstRow,
                                                                     short firstCol,
                                                                     short endRow, short endCol,
                                                                     String formula)
    {
        HSSFDataValidationHelper dvHelper = new HSSFDataValidationHelper(sheet);
        DataValidationConstraint dvConstraint = (DataValidationConstraint)dvHelper
            .createCustomConstraint(formula);
        CellRangeAddressList addressList = new CellRangeAddressList(firstRow, endRow, firstCol,
            endCol);
        HSSFDataValidation validation = (HSSFDataValidation)dvHelper.createValidation(dvConstraint,
            addressList);

        validation.createErrorBox("错误：", "赋值属性列不允许重复");
        validation.setShowErrorBox(true);
        validation.setEmptyCellAllowed(true);
        validation.setSuppressDropDownArrow(true);
        validation.setShowPromptBox(true);
        validation.setErrorStyle(DataValidation.ErrorStyle.STOP);

        return validation;
    }

HSSFDataValidation dataValidation4Formula = getDataValidationCustomFormula(
                    (HSSFSheet)sheetCreat, (short)0, (short)3, (short)(1000), (short)3,
                    "COUNTIF($D$2:D2,D2)=1");
                if (null != dataValidation4Formula)
                {
                    sheetCreat.addValidationData(dataValidation4Formula);
                }

5.POI设置Excel单元格字体

/**
     * <设置单元格格式>
     *
     * @param wbCreat wbCreat
     * @return style style
     * @throws
     */
    private static CellStyle setCellFormat(HSSFWorkbook wbCreat)
    {
        Font font = wbCreat.createFont();
        font.setFontHeightInPoints((short)11);
        font.setBold(true);

        CellStyle style = wbCreat.createCellStyle();
        style.setFont(font);

        return style;
    }

6.设置单元格规则