Java导出Excel模版多级联动下拉及导入

话不多说 看码

import com.zjy.platform.supplier.param.device.DeviceTemplateImportDTO;
import lombok.Data;
import org.apache.commons.collections.CollectionUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.usermodel.*;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.*;
 
/**
 * <a> 代码千万行 注释第一行 编程不规范 同事两行泪 </a>
 *
 * @author Enzo
 * @date 2024-05-15 15:33
 * @description excel导出工具类
 */
@Data
public class ExcelExportUtil {
 
    /**
     * 导出数据最大行数
     */
    private static final int MAX_ROWS = 3000;
    /**
     * 数据页sheet名称
     */
    private static final String DATA_SHEET_NAME = "dataSheet";
 
    /**
     * 标头
     */
    private List<String> headersList;
 
    /**
     * 单选下拉框数据源
     */
    private List<String> selectDropdownList;
 
    /**
     * 单选下拉框列 开始下标 从0开始
     */
    private int singleChoiceColumnIndex;
 
    /**
     * 多级联动下拉数据源
     */
    private Map<String, List<String>> multilevelDropDownDataSource;
 
    /**
     * 多级联动下拉框列 开始下标 从0开始
     */
    private int multilevelDropDownStartColumn;
 
    /**
     * 多级联动数据源
     */
    private int multilevelDropDownLevel;
 
    public ExcelExportUtil() {
    }
 
    /**
     * 生成只有标头的模板
     *
     * @param headersList 标头
     */
    public ExcelExportUtil(List<String> headersList) {
        this.headersList = headersList;
    }
 
    /**
     * 生成标头 单选 模板
     *
     * @param headersList             标头
     * @param selectDropdownList      单选数据源
     * @param singleChoiceColumnIndex 单选开始列 从0计算
     */
    public ExcelExportUtil(List<String> headersList, List<String> selectDropdownList, int singleChoiceColumnIndex) {
        this.headersList = headersList;
        this.selectDropdownList = selectDropdownList;
        this.singleChoiceColumnIndex = singleChoiceColumnIndex;
    }
 
    /**
     * 生成标头 多级联动下拉 模板
     *
     * @param headersList                   标头
     * @param multilevelDropDownDataSource  多级联动下拉 数据源
     * @param multilevelDropDownStartColumn 多级联动下拉 开始列 从0计算
     * @param multilevelDropDownLevel       多级联动下拉  层级
     */
    public ExcelExportUtil(List<String> headersList, Map<String, List<String>> multilevelDropDownDataSource, int multilevelDropDownStartColumn,
                           int multilevelDropDownLevel) {
        this.headersList = headersList;
        this.multilevelDropDownDataSource = multilevelDropDownDataSource;
        this.multilevelDropDownStartColumn = multilevelDropDownStartColumn;
        this.multilevelDropDownLevel = multilevelDropDownLevel;
    }
 
    /**
     * 生成标头 单选及多级联动下拉 模板
     *
     * @param headersList                   标头
     * @param selectDropdownList            单选数据源
     * @param singleChoiceColumnIndex       单选开始列 从0计算
     * @param multilevelDropDownDataSource  多级联动下拉 数据源
     * @param multilevelDropDownStartColumn 多级联动下拉 开始列 从0计算
     * @param multilevelDropDownLevel       多级联动下拉  层级
     */
    public ExcelExportUtil(List<String> headersList, List<String> selectDropdownList, int singleChoiceColumnIndex,
                           Map<String, List<String>> multilevelDropDownDataSource, int multilevelDropDownStartColumn, int multilevelDropDownLevel) {
        this.headersList = headersList;
        this.selectDropdownList = selectDropdownList;
        this.singleChoiceColumnIndex = singleChoiceColumnIndex;
        this.multilevelDropDownDataSource = multilevelDropDownDataSource;
        this.multilevelDropDownStartColumn = multilevelDropDownStartColumn;
        this.multilevelDropDownLevel = multilevelDropDownLevel;
    }
 
 
    public XSSFWorkbook exportExcel() {
        XSSFWorkbook xssfWorkBook = new XSSFWorkbook();
        XSSFSheet mainSheet = xssfWorkBook.createSheet(DATA_SHEET_NAME);
        //初始化标头
        if (CollectionUtils.isNotEmpty(headersList)) {
            initHeaders(xssfWorkBook, mainSheet, headersList);
        }
        //单选框
        if (CollectionUtils.isNotEmpty(selectDropdownList)) {
            generateDropDownBox(xssfWorkBook, mainSheet, selectDropdownList, singleChoiceColumnIndex);
        }
        //多级联动
        if (!multilevelDropDownDataSource.isEmpty()) {
            generateMultilevelDropDownBox(xssfWorkBook, mainSheet, multilevelDropDownDataSource, multilevelDropDownStartColumn,
                    multilevelDropDownLevel);
        }
        return xssfWorkBook;
    }
 
 
    /**
     * 生成单层下拉框
     *
     * @param xssfWorkBook 工作簿
     * @param mainSheet    主sheet
     * @param dataList     下拉数据
     */
    public void generateDropDownBox(XSSFWorkbook xssfWorkBook, XSSFSheet mainSheet, List<String> dataList, int columnIndex) {
        String sheetName = "singleChoiceSheet";
        XSSFSheet deviceTypeSheet = xssfWorkBook.createSheet(sheetName);
        // 设置sheet是否隐藏
        xssfWorkBook.setSheetHidden(xssfWorkBook.getSheetIndex(deviceTypeSheet), true);
        writeDropDownData(xssfWorkBook, deviceTypeSheet, dataList, sheetName);
        //设置属性下拉
        XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(mainSheet);
        DataValidationConstraint deviceTypeConstraint = dvHelper.createFormulaListConstraint(sheetName);
        // 四个参数分别是：起始行、终止行、起始列、终止列  1 (下拉框代表从excel第1+1行开始) 10(下拉框代表从excel第1+10行结束) 5(代表第几列开始，0是第一列，1是第二列) 5(代表第几列结束，0是第一列，1是第二列)
        CellRangeAddressList deviceTypeRangeAddressList = new CellRangeAddressList(1, MAX_ROWS, columnIndex, columnIndex);
        XSSFDataValidation deviceTypeDataValidation = (XSSFDataValidation) dvHelper.createValidation(deviceTypeConstraint,
                deviceTypeRangeAddressList);
        deviceTypeDataValidation.setShowErrorBox(true);
        deviceTypeDataValidation.createPromptBox("Error", "请选择或输入有效的选项！");
        mainSheet.addValidationData(deviceTypeDataValidation);
    }
 
    /**
     * 生成多级联动下拉框
     *
     * @param xssfWorkBook       工作簿
     * @param assetSheet         主sheet
     * @param dropDownDataSource 数据源 Map 父名称 子名称集合
     * @param columnStep         开始列
     * @param totalLevel         总层级
     */
    public static void generateMultilevelDropDownBox(XSSFWorkbook xssfWorkBook, XSSFSheet assetSheet, Map<String, List<String>> dropDownDataSource,
                                                     int columnStep, int totalLevel) {
        String sheetName = "multilevelSheet";
        XSSFSheet dataSourceSheet = xssfWorkBook.createSheet(sheetName);
        xssfWorkBook.setSheetHidden(xssfWorkBook.getSheetIndex(sheetName), true);
        XSSFRow headerRow = dataSourceSheet.createRow(0);
        String[] firstValidationArray = null;
        boolean firstTime = true;
        int columnIndex = 0;
        // 构造名称管理器数据源
        for (String key : dropDownDataSource.keySet()) {
            Cell cell = headerRow.createCell(columnIndex);
            cell.setCellValue(key);
            if (dropDownDataSource.get(key) == null || dropDownDataSource.get(key).size() == 0) {
                continue;
            }
            ArrayList<String> values = (ArrayList<String>) dropDownDataSource.get(key);
            if (firstTime) {
                firstValidationArray = values.toArray(new String[0]);
            }
            int dataRowIndex = 1;
            for (String value : values) {
                Row row = firstTime ? dataSourceSheet.createRow(dataRowIndex) : dataSourceSheet.getRow(dataRowIndex);
                if (row == null) {
                    row = dataSourceSheet.createRow(dataRowIndex);
                }
                row.createCell(columnIndex).setCellValue(value);
                dataRowIndex++;
            }
            // 构造名称管理器
            char start = (char) ('A' + columnIndex);
            int startRow = 2;
            String range = "$" + start + "$" + startRow + ":$" + start + "$" + (startRow + values.size() - 1);
            Name name = xssfWorkBook.createName();
            name.setNameName(key);
            String formula = sheetName + "!" + range;
            name.setRefersToFormula(formula);
            columnIndex++;
            firstTime = false;
        }
        // 第一级设置DataValidation
        XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(assetSheet);
        DataValidationConstraint firstConstraint = dvHelper.createExplicitListConstraint(firstValidationArray);
        CellRangeAddressList firstRangeAddressList = new CellRangeAddressList(1, MAX_ROWS, columnStep, columnStep);
        DataValidation firstDataValidation = dvHelper.createValidation(firstConstraint, firstRangeAddressList);
        firstDataValidation.setShowErrorBox(true);
        firstDataValidation.createPromptBox("Error", "请选择有效的选项！");
        assetSheet.addValidationData(firstDataValidation);
        // 剩下的层级设置DataValidation
        for (int i = 1; i < totalLevel; i++) {
            char[] offset = new char[1];
            offset[0] = (char) ('A' + columnStep + i - 1);
            int rowNum = 2;
            String formulaString = "INDIRECT($" + new String(offset) + (rowNum) + ")";
            XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper.createFormulaListConstraint(formulaString);
            CellRangeAddressList regions = new CellRangeAddressList(1, MAX_ROWS, columnStep + i, columnStep + i);
            XSSFDataValidation dataValidationList = (XSSFDataValidation) dvHelper.createValidation(dvConstraint, regions);
            dataValidationList.setShowErrorBox(true);
            dataValidationList.createPromptBox("Error", "请选择有效的选项！");
            assetSheet.addValidationData(dataValidationList);
        }
    }
 
    /**
     * 初始化标头
     *
     * @param xssfWorkbook 工作簿
     * @param mainSheet    sheet
     * @param headers      标头数据
     */
    private void initHeaders(XSSFWorkbook xssfWorkbook, XSSFSheet mainSheet, List<String> headers) {
        //表头样式
        XSSFCellStyle style = xssfWorkbook.createCellStyle();
        // 创建一个居中格式
        style.setAlignment(HorizontalAlignment.CENTER);
        //字体样式
        XSSFFont fontStyle = xssfWorkbook.createFont();
        fontStyle.setFontName("微软雅黑");
        fontStyle.setFontHeightInPoints((short) 12);
        fontStyle.setBold(true);
        style.setFont(fontStyle);
        //生成主内容
        //第一个sheet的第一行为标题
        XSSFRow rowFirst = mainSheet.createRow(0);
        //冻结第一行
        mainSheet.createFreezePane(0, 1, 0, 1);
        //写标题
        for (int i = 0; i < headers.size(); i++) {
            //获取第一行的每个单元格
            XSSFCell cell = rowFirst.createCell(i);
            //设置每列的列宽
            mainSheet.setColumnWidth(i, 4000);
            //加样式
            cell.setCellStyle(style);
            //往单元格里写数据
            cell.setCellValue(headers.get(i));
        }
    }
 
    /**
     * 循环单个下拉框的数据写入sheet的第A列中
     *
     * @param xssfWorkBook 工作簿
     * @param sheet        主sheet
     * @param list         数据源
     * @param name         sheet名称
     */
    private void writeDropDownData(XSSFWorkbook xssfWorkBook, XSSFSheet sheet, List<String> list, String name) {
        //循环单个下拉框的数据写入sheet的第A列中
        for (int i = 0; i < list.size(); i++) {
            XSSFRow genderRow = sheet.createRow(i);
            genderRow.createCell(0).setCellValue(list.get(i));
        }
        // 创建数据规则
        Name genderName = xssfWorkBook.createName();
        genderName.setNameName(name);
        genderName.setRefersToFormula(sheet.getSheetName() + "!$A$1:$A$" + list.size());
    }
 
    /**
     * 输出到硬盘
     *
     * @param filePath     路径
     * @param xssfWorkBook 工作簿
     */
    public static void writeToFile(String filePath, XSSFWorkbook xssfWorkBook) {
        FileOutputStream os = null;
        try {
            String existName = filePath.substring(0, filePath.lastIndexOf("/"));
            File f = new File(existName);
            if (!f.exists()) {
                f.mkdirs();
            }
            // 创建可写入的Excel工作簿
            File file = new File(filePath);
            if (!file.exists()) {
                file.createNewFile();
            } else {
                file.delete();
                file.createNewFile();
            }
            os = new FileOutputStream(filePath);
            xssfWorkBook.write(os);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            IOUtils.closeQuietly(os);
        }
    }
 
    /**
     * excel 导入 读取数据
     *
     * @param inputStream 文件输入流
     * @param beanType    实体类
     * @param <T>         实体类泛型
     * @return 实体类列表
     * @throws Exception io 异常
     */
    public <T> List<T> importExcel(InputStream inputStream, Class<T> beanType) throws Exception {
        Workbook workbook = new XSSFWorkbook(inputStream);
        Sheet sheet = workbook.getSheet(DATA_SHEET_NAME);
        List<T> result = new ArrayList<>();
        for (Row row : sheet) {
            if (row.getRowNum() == 0) {
                continue;
            }
            T beanClass = beanType.newInstance();
            Field[] fields = beanType.getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                Field field = fields[i];
                Cell cell = row.getCell(i, Row.MissingCellPolicy.RETURN_BLANK_AS_NULL);
                if (cell != null) {
                    DataFormatter dataFormatter = new DataFormatter();
                    String stringCellValue = dataFormatter.formatCellValue(cell);
                    String filedName = field.getName();
                    String methodName = "set" + filedName.substring(0, 1).toUpperCase() + filedName.substring(1);
                    Method method = beanType.getDeclaredMethod(methodName, String.class);
                    method.invoke(beanClass, stringCellValue);
                    field.setAccessible(true);
                }
            }
            result.add(beanClass);
        }
        return result;
    }
 
    public static void testExportTemplate() {
        String filePath = "D://mnt//设备批量导入模板.xlsx";
        //标头
        List<String> headers = Arrays.asList("*设备名称", "*设备类型", "*设备编号", "*所属街道", "*所属社区", "*所属小区", "*设备经度", "*设备纬度", "设备型号", "设备安装位置");
        //多选下拉
        Map<String, List<String>> dropDownDataSource = new LinkedHashMap<>();
        List<String> firstAreaNames = new ArrayList<>();
        firstAreaNames.add("街道1");
        firstAreaNames.add("街道2");
        dropDownDataSource.put("一级区域", firstAreaNames);
        List<String> secondLevel = new ArrayList<>();
        secondLevel.add("社区11");
        secondLevel.add("社区12");
        dropDownDataSource.put("街道1", secondLevel);
        List<String> jiedao2 = new ArrayList<>();
        jiedao2.add("社区21");
        jiedao2.add("社区22");
        dropDownDataSource.put("街道2", jiedao2);
        List<String> shequ11 = new ArrayList<>();
        shequ11.add("小区111");
        shequ11.add("小区112");
        dropDownDataSource.put("社区11", shequ11);
        List<String> shequ22 = new ArrayList<>();
        shequ22.add("小区221");
        shequ22.add("小区222");
        dropDownDataSource.put("社区22", shequ22);
        int multilevelDropDownStartColumn = 3;
        int multilevelDropDownLevel = 3;
        //单选下拉数据列表
        List<String> selectDropdownList = new ArrayList<>();
        selectDropdownList.add("视频摄像头");
        int singleChoiceColumnIndex = 1;
        ExcelExportUtil excelExportUtil = new ExcelExportUtil(headers, selectDropdownList, singleChoiceColumnIndex, dropDownDataSource,
                multilevelDropDownStartColumn, multilevelDropDownLevel);
        XSSFWorkbook xssfWorkBook = excelExportUtil.exportExcel();
        //写入本地磁盘
        writeToFile(filePath, xssfWorkBook);
    }
 
    private static void testImportExcel() {
        ExcelExportUtil excelExportUtil = new ExcelExportUtil();
        String filePath = "D://mnt//设备批量导入模板.xlsx";
        try {
            InputStream inputStream = Files.newInputStream(Paths.get(filePath));
            List<DeviceTemplateImportDTO> deviceTemplateImportDTOS = excelExportUtil.importExcel(inputStream, DeviceTemplateImportDTO.class);
            System.out.println(deviceTemplateImportDTOS);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
 
    public static void main(String[] args) {
//        testExportTemplate();
        testImportExcel();
    }
 
 
}