关于EasyExcel 的一些生成模板,导入导出的使用心得

1 根据实体类生成对应的模板

/**
 *
 * excel 模板demo    还可以加一些属性的格式化注解   比如时间
 * @author: kuangql@fadada.com
 * @date: 2020/11/25 15:16
 * @description: TODO
 */
@Data
public class DemoExcelEntity {

    public static final String bigTitle= "填写须知: \n" +
            "1.第1、2行为固定结构,不可更改;以下示例行,导入前请先删除\n" +
            "2.请严格按照填写规则输入数据,不合规的数据无法成功导入";

    @ExcelProperty(value = {bigTitle,"姓名(必填)"}, index = 0)
    private String userName;

    @ExcelProperty(value = {bigTitle,"性别(必填)"}, index = 1)
    private String userSexName;

    @ExcelProperty(value = {bigTitle,"手机号码(必填)"}, index = 2)
    private String userMobile;

    @ExcelProperty(value = {bigTitle,"出生年月(必填)"}, index = 3)
    private String userBirthday;

    @ExcelProperty(value = {bigTitle,"工作单位(必填)"}, index = 4)
    private String deptName;

    @ExcelProperty(value = {bigTitle,"职务(必填)"}, index = 5)
    private String unitPosition;

    @ExcelProperty(value = {bigTitle,"干部类别(必填)"}, index = 6)
    private String leaderTypeName;

    @ExcelProperty(value = {bigTitle,"用户状态(必填)"}, index = 7)
    private String userStatusName;




    /**
     * 每个模板的首行高度, 换行数目+2 乘以15
     */
    public   static int getHeadHeight(){
        return  (StringUtils.getCharCounts(bigTitle,"\n")+2)*15;
    }
}

2 根据该实体类生成的excel模板样式如下:

 

 

3  解释下@ExcelProperty这个注解

 3.1 在实体属性上增加这个注解。表示这个属性是会输出到excel单元格里,怎么输出呢,就是由 value 和index 来控制。

 3.2 value 存放的值是一个数组。数组元素几个,表示占用几行作为表头。index表示该实体类的属性在单元格的那一列。

 3.3  结合我的demo看,我的value 存放的元素大小为2,所以我的表头为2行。如果需要出现占据多行的样式,就在对应的元素位置放相同的内容,就会形成合并单元格。

 

4

excelUtil 工具类:

    /**
     * 生成excel模板
     *
     * @param response
     * @param fileName    下载的文件名,
     * @param sheetName   sheet名
     * @param data        导出的数据
     * @param model       导出的头
     * @param heardHeight 头行高
     */
    public static void createTemplate(HttpServletResponse response, String fileName,
                                      String sheetName, List<? extends Object> data,
                                      Class<?> model, int heardHeight)  {

        HorizontalCellStyleStrategy horizontalCellStyleStrategy = setMyCellStyle();
        EasyExcel.write(getOutputStream(fileName, response, ExcelTypeEnum.XLSX), model).
                excelType(ExcelTypeEnum.XLSX).sheet(sheetName)
                .registerWriteHandler(new TemplateCellWriteHandler(heardHeight))
                .registerWriteHandler(horizontalCellStyleStrategy)
                .doWrite(data);
    }


    /**
     * 创建我的cell  策略
     *
     * @return
     */
    public static HorizontalCellStyleStrategy setMyCellStyle() {

        // 头的策略
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        // 设置表头居中对齐
        headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        // 颜色
        headWriteCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        WriteFont headWriteFont = new WriteFont();
        headWriteFont.setFontHeightInPoints((short) 10);
        // 字体
        headWriteCellStyle.setWriteFont(headWriteFont);
        headWriteCellStyle.setWrapped(true);

        // 内容的策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        // 设置内容靠中对齐
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        // 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
        // 这里 需要指定写用哪个class去写,然后写到第一个sheet,名字为模板 然后文件流会自动关闭

        return horizontalCellStyleStrategy;
    }

  

4.1 controller相关代码:

 

    @ApiOperation(value = "下载模板文件测试-----该方法是测试使用")
    @GetMapping("/template2/{type}")
    public void template2(@PathVariable("type") String type, HttpServletResponse response) {
        String fileName = "导入模板";
        String sheetName = "模板";
        try {

            //   List<DemoExcelEntity> sysUserImportExcelList = getSysUserImportExcel();
            //输出文件流

            //后期根据传参处理获取对应的模板实体类     如果需要导出数据,将nul改为对应List<DemoExcelEntity> 传进去
           ExcelUtils.createTemplate(response, fileName, sheetName, null,
                    DemoExcelEntity.class, DemoExcelEntity.getHeadHeight());

        } catch (Exception e) {
            e.printStackTrace();

        }
    }


  

   4.3 读取文件数据:

    1 我的文件数据截图:

 

2 表头占据了2行,所以读取数据的时候需要跳过2行表头。 2行表头等于@ExcelProperty里的value 元素个数

代码如下:

 

    /**
     * 读取 Excel(第一个 sheet)  指定行开始读取
     * @param excel  文件
     * @param rowType  模板实体类
     * @param header   指定不读取的表头行数,
     * @param <T>
     * @return   集合数据
     * @throws ExcelException
     */
    public static <T> List<T> readFirstSheetExcel(MultipartFile excel, Class<T> rowType,int header) throws ExcelException {
        ExcelReader reader = getReader(excel, header);
        if (reader == null) {
            return new ArrayList<>();
        }
        return readExcel(reader, rowType, 0);
    }

 

 

3 如果在导入数据的时候,需要将导入的数据的错误信息追加到后一列,可以新建一个实体类

 

/**
 * 用于输出 导入的时候,错误信息输出
 * @author: kuangql@fadada.com
 * @date: 2020/11/27 13:37
 * @description: TODO
 */
@Data
public class DemoExcelEntityError extends DemoExcelEntity {


    /**
     * 说明:  该对象只针对导入的时候,在用户上传的文件后面追加一列错误信息描述
     */


    @ExcelProperty(value = {bigTitle,"错误描述"}, index = 8)
    private String errorMessage;


}

 

    //  该方法是测试使用
    @ApiOperation(value = "上传文件数据------测试使用   返回错误信息  ")
    @PostMapping("/upload")
    public void template2(MultipartFile multipartFile, HttpServletResponse response) {


        List<DemoExcelEntity> demoExcelEntities = ExcelUtils.readFirstSheetExcel(multipartFile, DemoExcelEntity.class, 2);
        List<DemoExcelEntityError> demoExcelEntityErrorList = new ArrayList<>();
        demoExcelEntities.forEach(
                demoExcelEntity -> {
                    System.out.println(demoExcelEntity.toString());
                    DemoExcelEntityError demoExcelEntityError = new DemoExcelEntityError();
                    BeanUtils.copyProperties(demoExcelEntity, demoExcelEntityError);
                    demoExcelEntityError.setErrorMessage("我的错误信息描述");
                    demoExcelEntityErrorList.add(demoExcelEntityError);
                }
        );
        ExcelUtils.writeExcel(response, demoExcelEntityErrorList, "demo", "1", ExcelTypeEnum.XLSX);

    }

 

效果如下:

 

 

 

好了,基本描述完毕。如下是所有相关的代码:


 

/**
 * excel导入导出工具类
 * BeanCopy ExcelException 属于自定义数据,属于可自定义依赖
 *
 * @version 2.0.0
 * @author: 
 * @date: 2020/10/27
 */
@NoArgsConstructor
public class ExcelUtils {




    /**
     * 读取 Excel(多个 sheet)
     * @param reader  读取的excel
     * @param rowModel excel模板实体类
     * @param sheetCount sheet
     * @param <T>
     * @return
     */
    public static <T> List<T> readExcel(ExcelReader reader, Class<T> rowModel, int sheetCount) {
        if (reader == null) {
            return new ArrayList<>();
        }
        List<ReadSheet> readSheetList = new ArrayList<>();
        ExcelListener<T> excelListener = new ExcelListener<>();
        ReadSheet readSheet = EasyExcel.readSheet(sheetCount)
                .head(rowModel)
                .registerReadListener(excelListener)
                .build();
        readSheetList.add(readSheet);
        reader.read(readSheetList);
        return getExtendsBeanList(excelListener.getDataList(), rowModel);
    }


    /**

     * 读取 Excel(多个 sheet)
     * 将多sheet合并成一个list数据集,通过自定义ExcelReader继承AnalysisEventListener
     * 重写invoke doAfterAllAnalysed方法
     * getExtendsBeanList 主要是做Bean的属性拷贝 ,可以通过ExcelReader中添加的数据集直接获取
     *
     * @param excel 文件
     * @param header 不读取表头数目(表头2行,读取数据时候从第三行开始,读取几行看对应的模板实体类)
     * @param sheetNo
     * @param rowModel  excel模板实体类
     * @return
     * @throws ExcelException
     */
    private static List[] readExcel(MultipartFile excel,int header, Integer sheetNo, Class<?>[] rowModel) throws ExcelException {
        ExcelReader reader = getReader(excel,header);
        if (reader == null) {
            return new ArrayList[rowModel.length];
        }
        List[] result = new ArrayList[rowModel.length];
        for (int sheetCount = 0; sheetCount < rowModel.length; sheetCount++) {
            if (sheetNo != null && sheetNo != sheetCount) {
                continue;
            }
            result[sheetCount].addAll(readExcel(reader, rowModel[sheetCount], sheetCount));
        }
        return result;
    }



    /**
     * 读取 Excel(多个 sheet)
     * 将多sheet合并成一个list数据集,通过自定义ExcelReader继承AnalysisEventListener
     * 重写invoke doAfterAllAnalysed方法
     * getExtendsBeanList 主要是做Bean的属性拷贝 ,可以通过ExcelReader中添加的数据集直接获取
     * @param excel
     * @param header 不读取表头数目(表头2行,读取数据时候从第三行开始,读取几行看对应的模板实体类)
     * @param rowModel
     * @return
     * @throws ExcelException
     */
    public static List[] readExcel(MultipartFile excel, int header ,Class<?>... rowModel) throws ExcelException {
        ExcelReader reader = getReader(excel,header);
        if (reader == null) {
            return new ArrayList[rowModel.length];
        }
        List[] result = new ArrayList[rowModel.length];
        for (int sheetCount = 0; sheetCount < rowModel.length; sheetCount++) {
            result[sheetCount] = new ArrayList<>(readExcel(reader, rowModel[sheetCount], sheetCount));
        }
        return result;
    }



    /**
     * 读取 Excel(单个 sheet)
     * 将多sheet合并成一个list数据集,通过自定义ExcelReader继承AnalysisEventListener
     * 重写invoke doAfterAllAnalysed方法
     * getExtendsBeanList 主要是做Bean的属性拷贝 ,可以通过ExcelReader中添加的数据集直接获取
     */
     /*
    public static <T> List<T> readFirstSheetExcel(MultipartFile excel, Class<T> rowType) throws ExcelException {
        ExcelReader reader = getReader(excel);
        if (reader == null) {
            return new ArrayList<>();
        }
        return readExcel(reader, rowType, 0);
    }


    */



    /**
     * 读取某个 sheet 的 Excel
     *
     * @param excel    文件
     * @param rowModel 实体类映射
     * @param sheetNo  sheet 的序号 从1开始
     * @return Excel 数据 list
     */
    public static <T> List readExcel(MultipartFile excel, Class<T> rowModel, int sheetNo) throws ExcelException {
        Class[] classes = {rowModel};
        return ExcelUtils.readExcel(excel, sheetNo, classes)[0];
    }

    /**
     * 导出 Excel :一个 sheet,带表头
     * 自定义WriterHandler 可以定制行列数据进行灵活化操作
     *
     * @param response  HttpServletResponse
     * @param list      数据 list
     * @param fileName  导出的文件名
     * @param sheetName 导入文件的 sheet 名
     */
    public static <T> void writeExcel(HttpServletResponse response, List<T> list,
                                      String fileName, String sheetName, ExcelTypeEnum excelTypeEnum) throws ExcelException {
        if (sheetName == null || "".equals(sheetName)) {
            sheetName = "sheet1";
        }
        if (CollectionUtils.isEmpty(list)) {
            return;
        }
        EasyExcel.write(getOutputStream(fileName, response, excelTypeEnum), list.get(0).getClass()).sheet(sheetName).doWrite(list);
    }

    /**
     * 导出 Excel :一个 sheet,带表头
     * 自定义WriterHandler 可以定制行列数据进行灵活化操作
     *
     * @param response HttpServletResponse
     * @param list     数据 list
     * @param fileName 导出的文件名
     */
    public static <T> void writeExcel(HttpServletResponse response, List<T> list,
                                      String fileName, ExcelTypeEnum excelTypeEnum) throws ExcelException {
        if (CollectionUtils.isEmpty(list)) {
            return;
        }
        String sheetName = list.get(0).getClass().getAnnotation(SheetName.class).value();
        sheetName = StrUtil.isNotBlank(sheetName) ? sheetName : "sheet1";
        EasyExcel.write(getOutputStream(fileName, response, excelTypeEnum), list.get(0).getClass()).sheet(sheetName).doWrite(list);
    }

    /**
     * 导出 Excel :一个 sheet,带表头
     * 自定义WriterHandler 可以定制行列数据进行灵活化操作
     *
     * @param response HttpServletResponse
     * @param fileName 导出的文件名
     */
    public static void writeExcel(HttpServletResponse response, String fileName,
                                  ExcelTypeEnum excelTypeEnum, List... lists) throws ExcelException {
        ExcelWriter excelWriter = null;
        try {
            excelWriter = EasyExcel.write(getOutputStream(fileName, response, excelTypeEnum)).build();
            for (int count = 0; count < lists.length; count++) {
                if (CollectionUtils.isEmpty(lists[count])) {
                    continue;
                }
                String sheetName = lists[count].get(0).getClass().getAnnotation(SheetName.class).value();
                sheetName = StrUtil.isNotBlank(sheetName) ? sheetName : "sheet" + (count + 1);
                WriteSheet writeSheet = EasyExcel.writerSheet(count, sheetName)
                        .head(lists[count].get(0).getClass())
                        .build();
                excelWriter.write(lists[count], writeSheet);
            }
        } finally {
            if (excelWriter != null) {
                excelWriter.finish();
            }
        }

    }




    /**
     * 导出文件时为Writer生成OutputStream
     */
    private static OutputStream getOutputStream(String fileName, HttpServletResponse response, ExcelTypeEnum excelTypeEnum) throws ExcelException {
        //创建本地文件
        String filePath = fileName + excelTypeEnum.getValue();
        try {
            fileName = new String(filePath.getBytes(), StandardCharsets.ISO_8859_1);
            response.setCharacterEncoding(StandardCharsets.UTF_8.name());
            response.setContentType("application/vnd.ms-excel");
            response.addHeader("Content-Disposition", "filename=" + fileName);
            return response.getOutputStream();
        } catch (IOException e) {
            throw new ExcelException(ResultCode.File.CREATE_FILE_FAILED);
        }
    }

    /**
     * 返回 ExcelReader
     *
     * @param excel 需要解析的 Excel 文件
     */

    /*
    public static ExcelReader getReader(MultipartFile excel) throws ExcelException {
        String fileName = excel.getOriginalFilename();
        if (fileName == null) {
            throw new ExcelException(ResultCode.File.FILE_FORMAT_ERROR);
        }
        if (!fileName.toLowerCase().endsWith(ExcelTypeEnum.XLS.getValue()) && !fileName.toLowerCase().endsWith(ExcelTypeEnum.XLSX.getValue())) {
            throw new ExcelException(ResultCode.File.FILE_FORMAT_ERROR);
        }
        InputStream inputStream;
        try {
            inputStream = excel.getInputStream();
            return EasyExcel.read(inputStream).build();
        } catch (IOException e) {
            //do something
        }
        return null;
    }

    */


    /**
     * 利用BeanCopy转换list
     */
    public static <T> List<T> getExtendsBeanList(List<?> list, Class<T> typeClazz) {
        return BeanConvertUtils.copyList(list, typeClazz);
    }








    /**
     * 生成excel模板
     *
     * @param response
     * @param fileName    下载的文件名,
     * @param sheetName   sheet名
     * @param data        导出的数据
     * @param model       导出的头
     * @param heardHeight 头行高
     */
    public static void createTemplate(HttpServletResponse response, String fileName,
                                      String sheetName, List<? extends Object> data,
                                      Class<?> model, int heardHeight)  {

        HorizontalCellStyleStrategy horizontalCellStyleStrategy = setMyCellStyle();
        EasyExcel.write(getOutputStream(fileName, response, ExcelTypeEnum.XLSX), model).
                excelType(ExcelTypeEnum.XLSX).sheet(sheetName)
                .registerWriteHandler(new TemplateCellWriteHandler(heardHeight))
                .registerWriteHandler(horizontalCellStyleStrategy)
                .doWrite(data);
    }


    /**
     * 创建我的cell  策略
     *
     * @return
     */
    public static HorizontalCellStyleStrategy setMyCellStyle() {

        // 头的策略
        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
        // 设置表头居中对齐
        headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        // 颜色
        headWriteCellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        WriteFont headWriteFont = new WriteFont();
        headWriteFont.setFontHeightInPoints((short) 10);
        // 字体
        headWriteCellStyle.setWriteFont(headWriteFont);
        headWriteCellStyle.setWrapped(true);

        // 内容的策略
        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
        // 设置内容靠中对齐
        contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);
        // 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
        // 这里 需要指定写用哪个class去写,然后写到第一个sheet,名字为模板 然后文件流会自动关闭

        return horizontalCellStyleStrategy;
    }






    /**
     * 读取 Excel(第一个 sheet)  指定行开始读取
     * @param excel  文件
     * @param rowType  模板实体类
     * @param header   指定不读取的表头行数,
     * @param <T>
     * @return   集合数据
     * @throws ExcelException
     */
    public static <T> List<T> readFirstSheetExcel(MultipartFile excel, Class<T> rowType,int header) throws ExcelException {
        ExcelReader reader = getReader(excel, header);
        if (reader == null) {
            return new ArrayList<>();
        }
        return readExcel(reader, rowType, 0);
    }



    /**
     *
     * @param excel 需要解析的 Excel 文件
     * @param header 指定不读取表头行数,
     * @return
     * @throws ExcelException
     */
    public static ExcelReader getReader(MultipartFile excel,int header) throws ExcelException {
        String fileName = excel.getOriginalFilename();
        if (fileName == null) {
            throw new ExcelException(ResultCode.File.FILE_FORMAT_ERROR);
        }
        if (!fileName.toLowerCase().endsWith(ExcelTypeEnum.XLS.getValue()) && !fileName.toLowerCase().endsWith(ExcelTypeEnum.XLSX.getValue())) {
            throw new ExcelException(ResultCode.File.FILE_FORMAT_ERROR);
        }
        InputStream inputStream;
        try {
            inputStream = excel.getInputStream();
            return EasyExcel.read(inputStream).
                    headRowNumber(header).
                    build();
        } catch (IOException e) {
            //do something
        }
        return null;
    }

}

 

2 实体类:



/**
 *
 * excel 模板demo    还可以加一些属性的格式化注解   比如时间
 * @author: kuangql@fadada.com
 * @date: 2020/11/25 15:16
 * @description: TODO
 */
@Data
public class DemoExcelEntity {

    public static final String bigTitle= "填写须知: \n" +
            "1.第1、2行为固定结构,不可更改;以下示例行,导入前请先删除\n" +
            "2.请严格按照填写规则输入数据,不合规的数据无法成功导入";

    @ExcelProperty(value = {bigTitle,"姓名(必填)"}, index = 0)
    private String userName;

    @ExcelProperty(value = {bigTitle,"性别(必填)"}, index = 1)
    private String userSexName;

    @ExcelProperty(value = {bigTitle,"手机号码(必填)"}, index = 2)
    private String userMobile;

    @ExcelProperty(value = {bigTitle,"出生年月(必填)"}, index = 3)
    private String userBirthday;

    @ExcelProperty(value = {bigTitle,"工作单位(必填)"}, index = 4)
    private String deptName;

    @ExcelProperty(value = {bigTitle,"职务(必填)"}, index = 5)
    private String unitPosition;

    @ExcelProperty(value = {bigTitle,"干部类别(必填)"}, index = 6)
    private String leaderTypeName;

    @ExcelProperty(value = {bigTitle,"用户状态(必填)"}, index = 7)
    private String userStatusName;




    /**
     * 每个模板的首行高度, 换行数目+2 乘以15
     */
    public   static int getHeadHeight(){
        return  (StringUtils.getCharCounts(bigTitle,"\n")+2)*15;
    }
}

  

 

 

 

/**
 * 用于输出 导入的时候,错误信息输出
 * @author: kuangql@fadada.com
 * @date: 2020/11/27 13:37
 * @description: TODO
 */
@Data
public class DemoExcelEntityError extends DemoExcelEntity {


    /**
     * 说明:  该对象只针对导入的时候,在用户上传的文件后面追加一列错误信息描述
     */


    @ExcelProperty(value = {bigTitle,"错误描述"}, index = 8)
    private String errorMessage;


}

 



/**
 * excel通用单元格格式类
 * @description:
 * @author:
 * @time: 2020/9/20 9:54
 */
public class TemplateCellWriteHandler implements CellWriteHandler {

    /**
     * 模板的首行行高 ,通过构造器注入
     */
    private  int height;

    public TemplateCellWriteHandler(int height) {
        this.height = height;
    }

    @Override
    public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {

    }

    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {

    }

    @Override
    public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {

    }




    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
        Workbook workbook = writeSheetHolder.getSheet().getWorkbook();
        CellStyle cellStyle = workbook.createCellStyle();
        Font font = workbook.createFont();
        if (cell.getRowIndex() == 0) {
            font.setFontHeightInPoints((short) 10);
            font.setFontName("宋体");
            //加粗
            font.setBold(true);
            cellStyle.setFont(font);
            cellStyle.setAlignment(HorizontalAlignment.CENTER);
            cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            //设置 自动换行
            cellStyle.setWrapText(true);
            Row row = cell.getRow();
            row.setHeightInPoints(height);
        } if (cell.getRowIndex() == 1) {
            font.setFontHeightInPoints((short) 11);
            font.setFontName("宋体");
            font.setBold(true);
            cellStyle.setFont(font);
            cellStyle.setAlignment(HorizontalAlignment.LEFT);
            cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            //设置 自动换行
            cellStyle.setWrapText(true);
            Row row = cell.getRow();
            row.setHeightInPoints(26);
        }
        cell.setCellStyle(cellStyle);

    }
}

  


 

posted @ 2020-11-27 15:54  夏风中的Young_Uncle  阅读(16868)  评论(6编辑  收藏  举报