poi导出excel下拉框联动--示例：学年学期

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/**
     * 导出课程excel
     *
     * @return
     */
    @AutoLog(value = "课程-导出课程excel")
    @ApiOperation(value = "课程-导出课程excel", notes = "导出课程excel")
    @GetMapping(value = "/export/courseExcel")
    public void export(HttpServletResponse res) throws Exception {
        // 创建一个excel
        @SuppressWarnings("resource")
        XSSFWorkbook book = new XSSFWorkbook();

        // 创建需要用户填写的sheet
        XSSFSheet sheetPro = (XSSFSheet) book.createSheet("课程导入模板");
        Row row0 = sheetPro.createRow(0);

        //设置单元格宽
        sheetPro.setColumnWidth(0,256*15);
        sheetPro.setColumnWidth(1,256*20);
        sheetPro.setColumnWidth(2,256*20);
        sheetPro.setColumnWidth(3,256*15);
        sheetPro.setColumnWidth(4,256*15);
        sheetPro.setColumnWidth(5,256*15);
        sheetPro.setColumnWidth(6,256*15);
        sheetPro.setColumnWidth(7,256*15);
        sheetPro.setColumnWidth(8,256*15);
        sheetPro.setColumnWidth(9,256*15);

        CellStyle style = CatalogExcelUtil.getHeadStyle(book);
　　　　　
　　　　　//设置第一行标题
        CatalogExcelUtil.initCell(row0.createCell(0), style, "编号");
        CatalogExcelUtil.initCell(row0.createCell(1), style, "课程代码");
        CatalogExcelUtil.initCell(row0.createCell(2), style, "全称");
        CatalogExcelUtil.initCell(row0.createCell(3), style, "英文名称");
        CatalogExcelUtil.initCell(row0.createCell(4), style, "学分");
        CatalogExcelUtil.initCell(row0.createCell(5), style, "学时");
        CatalogExcelUtil.initCell(row0.createCell(6), style, "学年");
        CatalogExcelUtil.initCell(row0.createCell(7), style, "学期");
        CatalogExcelUtil.initCell(row0.createCell(8), style, "状态");
        CatalogExcelUtil.initCell(row0.createCell(9), style, "开课来源");

        //得到学年名称，放在列表里
        List<SchoolYear> schoolYearList = schoolYearService.list();

        ArrayList<String> schoolYearSelectList = new ArrayList<>();
        for(int i=0; i < schoolYearList.size(); i++){
            String schoolYearName = schoolYearList.get(i).getName().replace(‘~‘,‘_‘);
            schoolYearSelectList.add("学年_"+schoolYearName);
        }
        //设置学年
        String[] yearList = new String[schoolYearSelectList.size()];
        schoolYearSelectList.toArray(yearList);

        //将有子区域的父区域放到一个数组中
        String[] areaFatherNameArr1 = yearList;
        Map<String,String[]> schoolYearMap = new HashMap<String, String[]>();

        for(SchoolYear sysDepart : schoolYearList){
            List<Semester> semesterList = semesterService.list(Wrappers.<Semester>query().lambda().eq(Semester::getSchoolYearId, sysDepart.getId()));
            ArrayList<String> semesterSelectList = new ArrayList<>();
            for(int i=0; i < semesterList.size(); i++){
                semesterSelectList.add(semesterList.get(i).getName());
            }
            //设置专业
            String[] semesters = new String[semesterSelectList.size()];
            semesterSelectList.toArray(semesters);
            String schoolYearName = sysDepart.getName().replace(‘~‘,‘_‘);  //将学年名称中的~替换成_(poi导出联动中，~和-符号无法识别，无法进行联动)
            schoolYearMap.put("学年_"+schoolYearName, semesters);    //设置父级对应的子级，下拉框联动父级不能以数字来头，必须为字母或者_符号
        }

        //创建一个专门用来存放学院专业信息的隐藏sheet页
        //因此也不能在现实页之前创建，否则无法隐藏。
        Sheet hideSheet1 = book.createSheet("area1");
        //这一行作用是将此sheet隐藏，功能未完成时注释此行,可以查看隐藏sheet中信息是否正确
        book.setSheetHidden(book.getSheetIndex(hideSheet1), true);

        int rowId1 = 0;
        // 设置第一行，存学院的信息
        Row provinceRow1 = hideSheet1.createRow(rowId1++);
        provinceRow1.createCell(0).setCellValue("学年学期");
        for(int i = 0; i < yearList.length; i ++){
            Cell provinceCell = provinceRow1.createCell(i + 1);
            provinceCell.setCellValue(yearList[i]);
        }
        // 将具体的数据写入到每一行中，行开头为父级区域，后面是子区域。
        for(int i = 0;i < areaFatherNameArr1.length;i++){
            String key = areaFatherNameArr1[i];
            String[] son = schoolYearMap.get(key);
            Row row = hideSheet1.createRow(rowId1++);
            row.createCell(0).setCellValue(key);
            for(int j = 0; j < son.length; j ++){
                Cell cell = row.createCell(j + 1);
                cell.setCellValue(son[j]);
            }

            // 添加名称管理器
            String range = getRange(1, rowId1, son.length);
            Name name = book.createName();
            //key不可重复
            name.setNameName(key);
            String formula = "area1!" + range;
            name.setRefersToFormula(formula);
        }

        XSSFDataValidationHelper dvHelper1 = new XSSFDataValidationHelper((XSSFSheet)sheetPro);
        // 学院规则
        DataValidationConstraint provConstraint1 = dvHelper1.createExplicitListConstraint(yearList);
        // 四个参数分别是：起始行、终止行、起始列、终止列
        CellRangeAddressList provRangeAddressList1 = new CellRangeAddressList(1, 2000, 8, 8);
        DataValidation provinceDataValidation1 = dvHelper1.createValidation(provConstraint1, provRangeAddressList1);
        //验证
        provinceDataValidation1.createErrorBox("error", "请选择正确的学年");
        provinceDataValidation1.setShowErrorBox(true);
        provinceDataValidation1.setSuppressDropDownArrow(true);
        sheetPro.addValidationData(provinceDataValidation1);

        //对前2000行设置有效性,G为学年对应的列，学期对应的为第8列
        for(int i = 2;i < 2000;i++){
            setDataValidation("G" ,sheetPro,i,8);
        }

        //设置状态
        String[] statusCourse = new String[]{"开课", "未开课"};
        DataValidation dataValidationStatusCourse = dropDownList(book, sheetPro, statusCourse, 1, 2000, 10, 10, "statusCourse", 3);

        // 作用在目标sheet上
        sheetPro.addValidationData(dataValidationStatusCourse);
        // 设置hiddenSheet隐藏
//        workbook.setSheetHidden(1, true);
//        workbook.setSheetHidden(2, true);

        // 第二行
        Row row2 = sheetPro.createRow(1);
        row2.setHeightInPoints(20);

        CatalogExcelUtil.initCell(row2.createCell(0), style, "1");
        CatalogExcelUtil.initCell(row2.createCell(1), style, "test123456");
        CatalogExcelUtil.initCell(row2.createCell(2), style, "测试课程");
        CatalogExcelUtil.initCell(row2.createCell(3), style, "testCourse");
        CatalogExcelUtil.initCell(row2.createCell(4), style, "3");
        CatalogExcelUtil.initCell(row2.createCell(5), style, "64");
        CatalogExcelUtil.initCell(row2.createCell(6), style, "2016-2017");
        CatalogExcelUtil.initCell(row2.createCell(7), style, "第一学期");
        CatalogExcelUtil.initCell(row2.createCell(8), style, "开课");
        CatalogExcelUtil.initCell(row2.createCell(9), style, "线下");

//
        //将excel的数据写入文件
        ByteArrayOutputStream fos = null;
        byte[] retArr = null;
        try {
            fos = new ByteArrayOutputStream();
            book.write(fos);
            retArr = fos.toByteArray();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            try {
                fos.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        OutputStream os = res.getOutputStream();
        try {
            String fileName = "课程模板.xlsx";//创建文件名
            fileName = URLEncoder.encode(fileName, "UTF-8");
            res.reset();
            res.setHeader("Content-disposition", "attachment;filename=" + fileName);
//        res.setHeader("Content-Disposition", "attachment; filename=课程模板.xls");//要保存的文件名
            res.setContentType("application/octet-stream; charset=utf-8");
            os.write(retArr);
            os.flush();
        } finally {
            if (os != null) {
                os.close();
            }
        }

    }

/**
 * 设置有效性
 * @param offset 主影响单元格所在列，即此单元格由哪个单元格影响联动
 * @param sheet
 * @param rowNum 行数
 * @param colNum 列数
 */
public static void setDataValidation(String offset,XSSFSheet sheet, int rowNum,int colNum) {
    XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
    DataValidation data_validation_list;
    data_validation_list = getDataValidationByFormula(
            "INDIRECT($" + offset + (rowNum) + ")", rowNum, colNum,dvHelper);
    sheet.addValidationData(data_validation_list);
}

/**
 * 加载下拉列表内容
 * @param formulaString
 * @param naturalRowIndex
 * @param naturalColumnIndex
 * @param dvHelper
 * @return
 */
private static  DataValidation getDataValidationByFormula(
        String formulaString, int naturalRowIndex, int naturalColumnIndex,XSSFDataValidationHelper dvHelper) {
    // 加载下拉列表内容
    // 举例：若formulaString = "INDIRECT($A$2)" 表示规则数据会从名称管理器中获取key与单元格 A2 值相同的数据，
    XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper.createFormulaListConstraint(formulaString);
    // 设置数据有效性加载在哪个单元格上。
    // 四个参数分别是：起始行、终止行、起始列、终止列
    int firstRow = naturalRowIndex -1;
    int lastRow = naturalRowIndex - 1;
    int firstCol = naturalColumnIndex - 1;
    int lastCol = naturalColumnIndex - 1;
    CellRangeAddressList regions = new CellRangeAddressList(firstRow,
            lastRow, firstCol, lastCol);
    // 数据有效性对象
    // 绑定
    XSSFDataValidation data_validation_list = (XSSFDataValidation) dvHelper.createValidation(dvConstraint, regions);
    data_validation_list.setEmptyCellAllowed(false);
    if (data_validation_list instanceof XSSFDataValidation) {
        data_validation_list.setSuppressDropDownArrow(true);
        data_validation_list.setShowErrorBox(true);
    } else {
        data_validation_list.setSuppressDropDownArrow(false);
    }
    // 设置输入信息提示信息
    data_validation_list.createPromptBox("下拉选择提示", "请使用下拉方式选择合适的值！");
    // 设置输入错误提示信息
    //data_validation_list.createErrorBox("选择错误提示", "你输入的值未在备选列表中，请下拉选择合适的值！");
    return data_validation_list;
}

private String getRange(int offset, int rowId, int colCount) {
    char start = (char)(‘A‘ + offset);
    if (colCount <= 25) {
        char end = (char)(start + colCount - 1);
        return "$" + start + "$" + rowId + ":$" + end + "$" + rowId;
    } else {
        char endPrefix = ‘A‘;
        char endSuffix = ‘A‘;
        if ((colCount - 25) / 26 == 0 || colCount == 51) {// 26-51之间，包括边界（仅两次字母表计算）
            if ((colCount - 25) % 26 == 0) {// 边界值
                endSuffix = (char)(‘A‘ + 25);
            } else {
                endSuffix = (char)(‘A‘ + (colCount - 25) % 26 - 1);
            }
        } else {// 51以上
            if ((colCount - 25) % 26 == 0) {
                endSuffix = (char)(‘A‘ + 25);
                endPrefix = (char)(endPrefix + (colCount - 25) / 26 - 1);
            } else {
                endSuffix = (char)(‘A‘ + (colCount - 25) % 26 - 1);
                endPrefix = (char)(endPrefix + (colCount - 25) / 26);
            }
        }
        return "$" + start + "$" + rowId + ":$" + endPrefix + endSuffix + "$" + rowId;
    }
}


public static DataValidation dropDownList(XSSFWorkbook wb, XSSFSheet sheet, String[] datas, int startRow, int endRow,
                                          int startCol, int endCol, String hidden, int num)
        throws Exception{

    XSSFWorkbook workbook = (XSSFWorkbook) wb;
    Sheet hideSheet1 = workbook.createSheet(hidden);

    for (int i = 0; i < datas.length; i++) {
        hideSheet1.createRow(i).createCell(0).setCellValue(datas[i]);
    }

    // 创建名称，可被其他单元格引用
    Name categoryName = workbook.createName();
    categoryName.setNameName(hidden);
    categoryName.setRefersToFormula(hidden + "!$A$1:$A$" + datas.length);
    DataValidationHelper helper = sheet.getDataValidationHelper();
    DataValidationConstraint constraint = helper.createFormulaListConstraint(hidden);

    // 设置下拉框位置
    CellRangeAddressList addressList = new CellRangeAddressList(startRow, endRow, startCol, endCol);
    DataValidation dataValidation = helper.createValidation(constraint, addressList);
    // 处理Excel兼容性问题
    if (dataValidation instanceof XSSFDataValidation) {
        // 数据校验
        dataValidation.setSuppressDropDownArrow(true);
        dataValidation.setShowErrorBox(true);
    } else {
        dataValidation.setSuppressDropDownArrow(false);
    }
    //隐藏工作表，num为传进来的第几个，0开始
    workbook.setSheetHidden(num, true);
    return dataValidation;
}

poi导出excel下拉框联动--示例：学年学期

标签：head   识别   边界值   star   api   ast   代码   erro   eva   

原文地址：https://www.cnblogs.com/jlov/p/14462164.html