使用 easypoi 导出带三级下拉联动的 excel

其他 2023-07-01 04:39:06 阅读次数: 0

关键方法：

    public static void insertThreeCascadeSelectData( Workbook workbook,
                                                     TreeMap<String, TreeMap<String,List<String>>> selectTree,
                                                     Integer colIndex_firstSelect,
                                                     Integer colIndex_secondSelect,
                                                     Integer colIndex_thirdSelect ) {
        if( selectTree == null ||
            selectTree.size() == 0 ||
            colIndex_firstSelect == null ||
            colIndex_secondSelect == null ||
            colIndex_thirdSelect == null ){
            return;
        }
        Sheet sheet = workbook.getSheetAt(0);
        if( sheet == null ){
            return;
        }
        String hiddenSheetName = "hiddensheet";
        Sheet hiddenSheet = workbook.createSheet( hiddenSheetName );
        // 将 selectTree 数据写到 隐藏 sheet 中
        Set<String> firstSelectNames = selectTree.keySet();
        // 都写到第一列，每列最多可以写65535行，写满了再写到第二列，以此类推...

        // 插入一级下拉框名称数据
        int rowIndex = 0;
        int colIndex = 0;
        Row row = getOrCreateRow(hiddenSheet, rowIndex++);
        int beginRowIndex = rowIndex + 1;
        int endRowIndex = 0;
        String formulaName = "total" + firstSelectNames.size() + "firstSelect";
        String formulaName_firstSelect = formulaName;
        row.createCell( colIndex ).setCellValue( formulaName );
        for( String firstSelectName:firstSelectNames ){
            row = getOrCreateRow(hiddenSheet, rowIndex++);
            row.createCell( colIndex ).setCellValue( firstSelectName );
        }
        endRowIndex = rowIndex;
        String colName = getColNameByColIndex(colIndex);
        String formula = hiddenSheetName + "!$" + colName + "$" + beginRowIndex + ":$" + colName + "$" + endRowIndex;
        bindFormula( workbook,formulaName,formula );

        // 插入二级下拉框名称数据
        for( String firstSelectName:firstSelectNames ){
            TreeMap<String, List<String>> map_secondSelectName_thirdSelectNames = selectTree.get( firstSelectName );
            Set<String> secondSelectNames = map_secondSelectName_thirdSelectNames.keySet();
            row = getOrCreateRow(hiddenSheet, rowIndex++);
            formulaName = firstSelectName;
            row.createCell( colIndex ).setCellValue( formulaName );
            beginRowIndex = rowIndex + 1;
            for( String secondSelectName:secondSelectNames ){
                row = getOrCreateRow( hiddenSheet,rowIndex++ );
                row.createCell( colIndex ).setCellValue( secondSelectName );
            }
            endRowIndex = rowIndex;
            colName = getColNameByColIndex( colIndex );
            formula = hiddenSheetName + "!$" + colName + "$" + beginRowIndex + ":$" + colName + "$" + endRowIndex;
            bindFormula( workbook,formulaName,formula );
        }

        // 插入三级下拉框名称数据
        for( String firstSelectName:firstSelectNames ){
            TreeMap<String, List<String>> map_secondSelectName_thirdSelectNames = selectTree.get( firstSelectName );
            Set<String> secondSelectNames = map_secondSelectName_thirdSelectNames.keySet();
            for( String secondSelectName:secondSelectNames ){
                List<String> thirdSelectNames = map_secondSelectName_thirdSelectNames.get( secondSelectName );
                if( rowIndex >= XLSX_MAX_ROW_NUM ){
                    rowIndex = 0;
                    colIndex++;
                }
                row = getOrCreateRow( hiddenSheet, rowIndex++ );
                formulaName =  secondSelectName;
                row.createCell( colIndex ).setCellValue( formulaName );
                beginRowIndex = rowIndex + 1;
                for( String thirdSelectName:thirdSelectNames ){
                    row = getOrCreateRow( hiddenSheet, rowIndex++ );
                    row.createCell( colIndex ).setCellValue( thirdSelectName );
                }
                endRowIndex = rowIndex;
                colName = getColNameByColIndex( colIndex );
                formula = hiddenSheetName + "!$" + colName + "$" + beginRowIndex + ":$" + colName + "$" + endRowIndex;
                bindFormula( workbook,formulaName,formula );
            }
        }

        XSSFDataValidationHelper helper = new XSSFDataValidationHelper( ( XSSFSheet ) sheet );

        // 设置第1个下拉框
        XSSFDataValidationConstraint constraint_firstSelect = new XSSFDataValidationConstraint( DataValidationConstraint.ValidationType.LIST, formulaName_firstSelect );
        CellRangeAddressList region_firstSelect = new CellRangeAddressList( 2, XLSX_MAX_ROW_NUM, colIndex_firstSelect, colIndex_firstSelect );
        XSSFDataValidation validation_firstSelect = (XSSFDataValidation) helper.createValidation( constraint_firstSelect, region_firstSelect );
        validation_firstSelect.setShowErrorBox( true );
        sheet.addValidationData( validation_firstSelect );

        // 设置第2个下拉框
        colName = getColNameByColIndex( colIndex_firstSelect );
        String indirect = "INDIRECT($" + colName + "2)";
        System.out.println( indirect );
        XSSFDataValidationConstraint constraint_secondSelect = (XSSFDataValidationConstraint) helper.createFormulaListConstraint( indirect );
        // XSSFDataValidationConstraint constraint_secondSelect = new XSSFDataValidationConstraint( DataValidationConstraint.ValidationType.LIST,indirect  );
        CellRangeAddressList region_secondSelect = new CellRangeAddressList( 1, XLSX_MAX_ROW_NUM, colIndex_secondSelect, colIndex_secondSelect );
        XSSFDataValidation validation_secondSelect = (XSSFDataValidation) helper.createValidation( constraint_secondSelect, region_secondSelect );
        validation_secondSelect.setShowErrorBox( true );
        sheet.addValidationData( validation_secondSelect );


        // 设置第3个下拉框
        colName = getColNameByColIndex( colIndex_secondSelect );
        indirect = "INDIRECT($" + colName + "2)";
        System.out.println( indirect );
        XSSFDataValidationConstraint constraint_thirdSelect = (XSSFDataValidationConstraint) helper.createFormulaListConstraint( indirect );
        // XSSFDataValidationConstraint constraint_thirdSelect = new XSSFDataValidationConstraint( DataValidationConstraint.ValidationType.LIST,indirect  );
        CellRangeAddressList region_thirdSelect = new CellRangeAddressList( 1, XLSX_MAX_ROW_NUM, colIndex_thirdSelect, colIndex_thirdSelect );
        XSSFDataValidation validation_thirdSelect = (XSSFDataValidation) helper.createValidation( constraint_thirdSelect, region_thirdSelect );
        validation_thirdSelect.setShowErrorBox( true );
        sheet.addValidationData( validation_thirdSelect );

        // 隐藏临时数据sheet
        int sheetCount = workbook.getNumberOfSheets();
        for (int i = 0; i < sheetCount; i++) {
            Sheet currSheet = workbook.getSheetAt(i);
            if( currSheet.getSheetName().equals( hiddenSheetName ) ){
                workbook.setSheetHidden(i, true);
            }
        }
    }

完成的 Excel工具类：

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import com.alibaba.fastjson.JSONObject;
import com.goldwind.ipark.common.util.TimeNodeUtil;
import com.pumch.ipark.pojo.model.ExcelCellRange;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.DVConstraint;
import org.apache.poi.hssf.usermodel.HSSFDataValidation;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.xssf.usermodel.XSSFDataValidation;
import org.apache.poi.xssf.usermodel.XSSFDataValidationConstraint;
import org.apache.poi.xssf.usermodel.XSSFDataValidationHelper;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTDataValidation;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.text.ParseException;
import java.util.*;

//Excel导入导出工具类
public class ExcelUtils {

    private static final Integer XLSX_MAX_ROW_NUM = 60000;

    /**
     * 功能描述：复杂导出Excel，包括文件名以及表名。创建表头
     * @param list 导出的实体类
     * @param title 表头名称
     * @param sheetName sheet表名
     * @param pojoClass 映射的实体类
     * @param isCreateHeader 是否创建表头
     * @param fileName
     * @param response
     * @return
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName, ExcelType.HSSF);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, null,response, exportParams);
    }


    /**
     * 功能描述：复杂导出Excel，包括文件名以及表名,不创建表头
     * @param list 导出的实体类
     * @param title 表头名称
     * @param sheetName sheet表名
     * @param pojoClass 映射的实体类
     * @param fileName
     * @param response
     * @return
     */
    public static void exportExcel(List<?> list,
                                   String title,
                                   String sheetName,
                                   Class<?> pojoClass,
                                   String fileName,
                                   Map<ExcelCellRange,List<String>> selectMap,
                                   HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, selectMap,response, new ExportParams(title, sheetName, ExcelType.XSSF));
    }

    /**
     * @param modles
     * @param title
     * @param sheetName
     * @param modleClass
     * @param saveFilePath
     * @param colIndex_firstSelect 第一列是0
     * @param colIndex_secondSelect 第一列是0
     * @param colIndex_thirdSelect 第一列是0
     * @param selectTree
     */
    public static void exportExcelWithThreeCascadeSelect( List<?> modles,
                                                           String title,
                                                           String sheetName,
                                                           Class<?> modleClass,
                                                           String fileName,
                                                           Integer colIndex_firstSelect,
                                                           Integer colIndex_secondSelect,
                                                           Integer colIndex_thirdSelect,
                                                           TreeMap<String,TreeMap<String,List<String>>> selectTree,
                                                           HttpServletResponse response ) {
        ExportParams exportParams = new ExportParams(title, sheetName, ExcelType.XSSF);
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, modleClass, modles);

        // 添加三级联动下拉框
        ExcelUtils.insertThreeCascadeSelectData( workbook,selectTree,colIndex_firstSelect,colIndex_secondSelect,colIndex_thirdSelect );

        // 下载内存中的 workbook 到输出流
        downLoadExcel( fileName,response,workbook );
    }

    public static void exportExcelWithSelect(List<?> list,
                                             String title,
                                             String sheetName,
                                             Class<?> pojoClass,
                                             String fileName,
                                             Map<Integer,List<String>> selectMap,
                                             HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, null,response, new ExportParams(title, sheetName, ExcelType.XSSF));
    }

    /**
     * 功能描述：Map 集合导出
     *
     * @param list 实体集合
     * @param fileName 导出的文件名称
     * @param response
     * @return
     */
    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }

    /**
     * 功能描述：默认导出方法
     * @param list 导出的实体集合
     * @param fileName 导出的文件名
     * @param pojoClass pojo实体
     * @param exportParams ExportParams封装实体
     * @param response
     * @return
     */
    private static void defaultExport(List<?> list,
                                      Class<?> pojoClass,
                                      String fileName,
                                      Map<ExcelCellRange,List<String>> selectMap,
                                      HttpServletResponse response,
                                      ExportParams exportParams) {
        long t1 = System.currentTimeMillis();
        System.out.println( "开始导出excel..." );
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        long t2 = System.currentTimeMillis();
        System.out.println( "导出excel完毕...导出耗时：" + ( t2 - t1 ) + "毫秒" );
//        //添加自定义样式
//        exportParams.setStyle(ExcelExportStylerUtil.class);

        // 添加下拉框
        // ExcelUtils.insertSelectList( workbook,selectMap );
        ExcelUtils.insertSelectListForLargeSelect( workbook,selectMap );

        if (workbook != null) {
            long t3 = System.currentTimeMillis();
            System.out.println( "开始下载excel..." );
            downLoadExcel(fileName, response, workbook);
            long t4 = System.currentTimeMillis();
            System.out.println( "下载excel完毕...下载耗时：" + ( t4 - t3 ) + "毫秒" );
        }
    }

    public static void insertSelectListForLargeSelect( Workbook workbook,Map<ExcelCellRange, List<String>> selectMap) {
        if( selectMap == null || selectMap.size() == 0 ){
            return;
        }
        Sheet sheet = workbook.getSheetAt(0);
        if( sheet == null ){
            return;
        }
        Set<ExcelCellRange> excelCellRanges = selectMap.keySet();
        for( ExcelCellRange excelCellRange:excelCellRanges ){
            Integer beginRow = excelCellRange.getBeginRow();
            Integer endRow = excelCellRange.getEndRow();
            Integer beginCol = excelCellRange.getBeginCol();
            Integer endCol = excelCellRange.getEndCol();
            String hiddenSheetName = "hiddensheet" + System.currentTimeMillis();
            Sheet hiddenSheet = workbook.createSheet( hiddenSheetName );
            List<String> selectList = selectMap.get(excelCellRange);
            int selctSize = selectList.size();
            for (int i = 0; i < selctSize; i++) {
                String selectValue = selectList.get(i);
                hiddenSheet.createRow( i )
                           .createCell( 0 )
                           .setCellValue( selectValue );
            }
            // 添加名称管理器
            // Name name = workbook.createName();
            // name.setNameName(hiddenSheetName);
            // String formulaText = "formulaText_beginRow" + beginRow + "_endRow" + endRow + "_beginCol" + beginCol + "_endCol" + endCol;
            String formula = hiddenSheetName + "!$A$1:$A$" + selctSize;
            // name.setRefersToFormula( formulaText );
            //设置下拉不受限制
            XSSFDataValidationConstraint constraint = new XSSFDataValidationConstraint( DataValidationConstraint.ValidationType.LIST, formula );
            // 设置区域边界
            CellRangeAddressList region = new CellRangeAddressList(beginRow, endRow, beginCol, endCol);
            XSSFDataValidationHelper helper = new XSSFDataValidationHelper((XSSFSheet) sheet);
            XSSFDataValidation validation = (XSSFDataValidation) helper.createValidation(constraint, region);
            // 输入非法数据时，弹窗警告框
            validation.setShowErrorBox(true);
            sheet.addValidationData(validation);
            int sheetCount = workbook.getNumberOfSheets();
            for (int i = 0; i < sheetCount; i++) {
                Sheet currSheet = workbook.getSheetAt(i);
                if( currSheet.getSheetName().equals( hiddenSheetName ) ){
                    workbook.setSheetHidden(i, true);
                }
            }
        }
    }

    public static void insertThreeCascadeSelectData( Workbook workbook,
                                                     TreeMap<String, TreeMap<String,List<String>>> selectTree,
                                                     Integer colIndex_firstSelect,
                                                     Integer colIndex_secondSelect,
                                                     Integer colIndex_thirdSelect ) {
        if( selectTree == null ||
            selectTree.size() == 0 ||
            colIndex_firstSelect == null ||
            colIndex_secondSelect == null ||
            colIndex_thirdSelect == null ){
            return;
        }
        Sheet sheet = workbook.getSheetAt(0);
        if( sheet == null ){
            return;
        }
        String hiddenSheetName = "hiddensheet";
        Sheet hiddenSheet = workbook.createSheet( hiddenSheetName );
        // 将 selectTree 数据写到 隐藏 sheet 中
        Set<String> firstSelectNames = selectTree.keySet();
        // 都写到第一列，每列最多可以写65535行，写满了再写到第二列，以此类推...

        // 插入一级下拉框名称数据
        int rowIndex = 0;
        int colIndex = 0;
        Row row = getOrCreateRow(hiddenSheet, rowIndex++);
        int beginRowIndex = rowIndex + 1;
        int endRowIndex = 0;
        String formulaName = "total" + firstSelectNames.size() + "firstSelect";
        String formulaName_firstSelect = formulaName;
        row.createCell( colIndex ).setCellValue( formulaName );
        for( String firstSelectName:firstSelectNames ){
            row = getOrCreateRow(hiddenSheet, rowIndex++);
            row.createCell( colIndex ).setCellValue( firstSelectName );
        }
        endRowIndex = rowIndex;
        String colName = getColNameByColIndex(colIndex);
        String formula = hiddenSheetName + "!$" + colName + "$" + beginRowIndex + ":$" + colName + "$" + endRowIndex;
        bindFormula( workbook,formulaName,formula );

        // 插入二级下拉框名称数据
        for( String firstSelectName:firstSelectNames ){
            TreeMap<String, List<String>> map_secondSelectName_thirdSelectNames = selectTree.get( firstSelectName );
            Set<String> secondSelectNames = map_secondSelectName_thirdSelectNames.keySet();
            row = getOrCreateRow(hiddenSheet, rowIndex++);
            formulaName = firstSelectName;
            row.createCell( colIndex ).setCellValue( formulaName );
            beginRowIndex = rowIndex + 1;
            for( String secondSelectName:secondSelectNames ){
                row = getOrCreateRow( hiddenSheet,rowIndex++ );
                row.createCell( colIndex ).setCellValue( secondSelectName );
            }
            endRowIndex = rowIndex;
            colName = getColNameByColIndex( colIndex );
            formula = hiddenSheetName + "!$" + colName + "$" + beginRowIndex + ":$" + colName + "$" + endRowIndex;
            bindFormula( workbook,formulaName,formula );
        }

        // 插入三级下拉框名称数据
        for( String firstSelectName:firstSelectNames ){
            TreeMap<String, List<String>> map_secondSelectName_thirdSelectNames = selectTree.get( firstSelectName );
            Set<String> secondSelectNames = map_secondSelectName_thirdSelectNames.keySet();
            for( String secondSelectName:secondSelectNames ){
                List<String> thirdSelectNames = map_secondSelectName_thirdSelectNames.get( secondSelectName );
                if( rowIndex >= XLSX_MAX_ROW_NUM ){
                    rowIndex = 0;
                    colIndex++;
                }
                row = getOrCreateRow( hiddenSheet, rowIndex++ );
                formulaName =  secondSelectName;
                row.createCell( colIndex ).setCellValue( formulaName );
                beginRowIndex = rowIndex + 1;
                for( String thirdSelectName:thirdSelectNames ){
                    row = getOrCreateRow( hiddenSheet, rowIndex++ );
                    row.createCell( colIndex ).setCellValue( thirdSelectName );
                }
                endRowIndex = rowIndex;
                colName = getColNameByColIndex( colIndex );
                formula = hiddenSheetName + "!$" + colName + "$" + beginRowIndex + ":$" + colName + "$" + endRowIndex;
                bindFormula( workbook,formulaName,formula );
            }
        }

        XSSFDataValidationHelper helper = new XSSFDataValidationHelper( ( XSSFSheet ) sheet );

        // 设置第1个下拉框
        XSSFDataValidationConstraint constraint_firstSelect = new XSSFDataValidationConstraint( DataValidationConstraint.ValidationType.LIST, formulaName_firstSelect );
        CellRangeAddressList region_firstSelect = new CellRangeAddressList( 2, XLSX_MAX_ROW_NUM, colIndex_firstSelect, colIndex_firstSelect );
        XSSFDataValidation validation_firstSelect = (XSSFDataValidation) helper.createValidation( constraint_firstSelect, region_firstSelect );
        validation_firstSelect.setShowErrorBox( true );
        sheet.addValidationData( validation_firstSelect );

        // 设置第2个下拉框
        colName = getColNameByColIndex( colIndex_firstSelect );
        String indirect = "INDIRECT($" + colName + "2)";
        System.out.println( indirect );
        XSSFDataValidationConstraint constraint_secondSelect = (XSSFDataValidationConstraint) helper.createFormulaListConstraint( indirect );
        // XSSFDataValidationConstraint constraint_secondSelect = new XSSFDataValidationConstraint( DataValidationConstraint.ValidationType.LIST,indirect  );
        CellRangeAddressList region_secondSelect = new CellRangeAddressList( 1, XLSX_MAX_ROW_NUM, colIndex_secondSelect, colIndex_secondSelect );
        XSSFDataValidation validation_secondSelect = (XSSFDataValidation) helper.createValidation( constraint_secondSelect, region_secondSelect );
        validation_secondSelect.setShowErrorBox( true );
        sheet.addValidationData( validation_secondSelect );


        // 设置第3个下拉框
        colName = getColNameByColIndex( colIndex_secondSelect );
        indirect = "INDIRECT($" + colName + "2)";
        System.out.println( indirect );
        XSSFDataValidationConstraint constraint_thirdSelect = (XSSFDataValidationConstraint) helper.createFormulaListConstraint( indirect );
        // XSSFDataValidationConstraint constraint_thirdSelect = new XSSFDataValidationConstraint( DataValidationConstraint.ValidationType.LIST,indirect  );
        CellRangeAddressList region_thirdSelect = new CellRangeAddressList( 1, XLSX_MAX_ROW_NUM, colIndex_thirdSelect, colIndex_thirdSelect );
        XSSFDataValidation validation_thirdSelect = (XSSFDataValidation) helper.createValidation( constraint_thirdSelect, region_thirdSelect );
        validation_thirdSelect.setShowErrorBox( true );
        sheet.addValidationData( validation_thirdSelect );

        // 隐藏临时数据sheet
        int sheetCount = workbook.getNumberOfSheets();
        for (int i = 0; i < sheetCount; i++) {
            Sheet currSheet = workbook.getSheetAt(i);
            if( currSheet.getSheetName().equals( hiddenSheetName ) ){
                workbook.setSheetHidden(i, true);
            }
        }
    }

    /**
     *
     * @param colIndex 0 表示第 1 列
     * @return
     */
    private static String getColNameByColIndex( int colIndex ) {
        StringBuilder s = new StringBuilder();
        while ( colIndex >= 26 ) {
            s.insert(0, ( char ) ( 'A' + colIndex % 26 ) );
            colIndex = colIndex / 26 - 1;
        }
        s.insert(0, ( char ) ( 'A' + colIndex ) );
        return s.toString();
    }

    private static void bindFormula( Workbook workbook,String formulaName, String formula ) {
        Name name = workbook.createName();
        name.setNameName( formulaName );
        name.setRefersToFormula( formula );
        System.out.println( "bind \"" + formulaName + "\" for formula \"" + formula + "\"" );
    }

    private static Row getOrCreateRow( Sheet sheet,int rowIndex ){
        Row row = sheet.getRow(rowIndex);
        if( row != null ){
            return row;
        }
        return sheet.createRow( rowIndex );
    }

    private static void insertSelectList( Workbook workbook,Map<ExcelCellRange, List<String>> selectMap) {
        if( selectMap == null || selectMap.size() == 0 ){
            return;
        }
        Sheet sheet = workbook.getSheetAt(0);
        if( sheet == null ){
            return;
        }
        Set<ExcelCellRange> excelCellRanges = selectMap.keySet();
        for( ExcelCellRange excelCellRange:excelCellRanges ){
            List<String> selectList = selectMap.get( excelCellRange );
            // 生成下拉框范围
            CellRangeAddressList cellRangeAddressList = new CellRangeAddressList(excelCellRange.getBeginRow(),
                    excelCellRange.getEndRow(),
                    excelCellRange.getBeginCol(),
                    excelCellRange.getEndCol());
            // 生成下拉框内容
            int size = selectList.size();
            String[] selectArray = new String[ size ];
            for( int i=0;i<size;i++ ){
                selectArray[ i ] = selectList.get( i );
            }
            XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper((XSSFSheet) sheet);
            XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper.createExplicitListConstraint( selectArray );
            XSSFDataValidation xssfDataValidation = (XSSFDataValidation) dvHelper.createValidation( dvConstraint, cellRangeAddressList );
            sheet.addValidationData( xssfDataValidation );
        }
    }

    /**
     * 功能描述：Excel导出
     * @param fileName 文件名称
     * @param response
     * @param workbook Excel对象
     * @return
     */
    public static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
        ServletOutputStream outputStream = null;
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/octet-stream");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            outputStream = response.getOutputStream();
            workbook.write( outputStream );
        } catch (IOException e) {
            throw new  RuntimeException(e);
        }finally {
            if( workbook != null ){
                try {
                    workbook.close();
                }catch ( Exception e ){
                    e.printStackTrace();
                }
            }
            if( outputStream != null ){
                try {
                    outputStream.close();
                }catch ( Exception e ){
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 功能描述：默认导出方法
     * @param list 导出的实体集合
     * @param fileName 导出的文件名
     * @param response
     * @return
     */
    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null) ;
        downLoadExcel(fileName, response, workbook);
    }


    /**
     * 功能描述：根据文件路径来导入Excel
     * @param filePath 文件路径
     * @param titleRows 表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass Excel实体类
     * @return
     */
    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        //判断文件是否存在
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new RuntimeException("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();

        }
        return list;
    }

    /**
     * 功能描述：根据接收的Excel文件来导入Excel,并封装成实体类
     * @param file 上传的文件
     * @param titleRows 表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass Excel实体类
     * @return
     */
    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new RuntimeException("excel文件不能为空");
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
        return list;
    }

    public static String jointExcelTitleName(String startTime,String endTime, String outType,String titleName){
        Date startDate = new Date();
        Date endDate = new Date();
        try {
            startDate = TimeNodeUtil.shortSdf.parse(startTime);
            endDate = TimeNodeUtil.shortSdf.parse(endTime);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        String startString = TimeNodeUtil.ymdSdf.format(startDate) ;
        String endString =  TimeNodeUtil.ymdSdf.format(endDate) ;
        String titleString = "";
        titleString = titleName+startString+"-"+endString;
        return titleString;
    }


}

 使用示例：

TreeMap<String, TreeMap<String,List<String>>> selectTree ==null; // todo 自己的三级联动业务数据
ExcelUtils.exportExcelWithThreeCascadeSelect( ${models},${tittle},${sheetName}, XxxModel.class,${fileName},4,5,6,selectTree, response);

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