1、新增Maven的依賴

 <!--EasyPoiUtil匯入依賴-->
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-base</artifactId>
            <version>4.1.0</version>
        </dependency>
        <dependency>
            <
 
groupId>cn.afterturn</groupId>
            <artifactId>easypoi-web</artifactId>
            <version>4.1.0</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-annotation</
 
artifactId>
            <version>4.1.0</version>
        </dependency>

2、操作Excl的工具類ExcelUtil

public class ExcelUtils {
    /**
     * excel 匯出
     *
     * @param list     資料列表
     * @param fileName 匯出時的excel名稱
     * @param response
     */
    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws
 
 IOException {
        defaultExport(list, fileName, response);
    }

    /**
     * 預設的 excel 匯出
     *
     * @param list     資料列表
     * @param fileName 匯出時的excel名稱
     * @param response
     */
    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws IOException {
        //把資料新增到excel表格中
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        downLoadExcel(fileName, response, workbook);
    }

    /**
     * excel 匯出
     *
     * @param list         資料列表
     * @param pojoClass    pojo型別
     * @param fileName     匯出時的excel名稱
     * @param response
     * @param exportParams 匯出引數（標題、sheet名稱、是否建立表頭，表格型別）
     */
    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) throws IOException {
        //把資料新增到excel表格中
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        downLoadExcel(fileName, response, workbook);
    }

    /**
     * excel 匯出
     *
     * @param list         資料列表
     * @param pojoClass    pojo型別
     * @param fileName     匯出時的excel名稱
     * @param exportParams 匯出引數（標題、sheet名稱、是否建立表頭，表格型別）
     * @param response
     */
    public static void exportExcel(List<?> list, Class<?> pojoClass, String fileName, ExportParams exportParams, HttpServletResponse response) throws IOException {
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }

    /**
     * excel 匯出
     *
     * @param list      資料列表
     * @param title     表格內資料標題
     * @param sheetName sheet名稱
     * @param pojoClass pojo型別
     * @param fileName  匯出時的excel名稱
     * @param response
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) throws IOException {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName, ExcelType.XSSF));
    }



    /**
     * excel 匯出
     *
     * @param list           資料列表
     * @param title          表格內資料標題
     * @param sheetName      sheet名稱
     * @param pojoClass      pojo型別
     * @param fileName       匯出時的excel名稱
     * @param isCreateHeader 是否建立表頭
     * @param response
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) throws IOException {
        ExportParams exportParams = new ExportParams(title, sheetName, ExcelType.XSSF);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }


    /**
     * excel下載
     *
     * @param fileName 下載時的檔名稱
     * @param response
     * @param workbook excel資料
     */
    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws IOException {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + ".xlsx", "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }



    /**
     * excel 匯入
     *
     * @param file      excel檔案
     * @param pojoClass pojo型別
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(MultipartFile file, Class<T> pojoClass) throws IOException {
        return importExcel(file, 1, 1, pojoClass);
    }

    /**
     * excel 匯入
     *
     * @param filePath   excel檔案路徑
     * @param titleRows  表格內資料標題行
     * @param headerRows 表頭行
     * @param pojoClass  pojo型別
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
//        params.setNeedSave(true); //不儲存
        params.setSaveUrl("/home/server/upload/excel/");
        try {
            return ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new IOException("模板不能為空");
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }


    /**
     * excel 匯入
     *
     * @param file       上傳的檔案
     * @param titleRows  表格內資料標題行
     * @param headerRows 表頭行
     * @param pojoClass  pojo型別
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
        if (file == null) {
            return null;
        }
        try {
            return importExcel(file.getInputStream(), titleRows, headerRows, pojoClass);
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }

    /**
     * excel 匯入
     *
     * @param inputStream 檔案輸入流
     * @param titleRows   表格內資料標題行
     * @param headerRows  表頭行
     * @param pojoClass   pojo型別
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(InputStream inputStream, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
        if (inputStream == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        params.setSaveUrl("/home/server/upload/excel/");
//        params.setNeedSave(true);  //不儲存
        try {
            return ExcelImportUtil.importExcel(inputStream, pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new IOException("excel檔案不能為空");
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }