阿里巴巴EasyExcel使用(2)-高亮和合并单元格

继续上一篇的EasyExcel,本次任务是:①高亮显示指定行的单元格的数据 ,②合并指定的单元格。

主要是红色部分代码~

一、自定义一个单元格样式

public class CustomCellWriteHandler implements CellWriteHandler { 
    private static final Logger LOGGER = LoggerFactory.getLogger(CustomCellWriteHandler.class);
    //标黄行宽集合
    private Set<Integer> yellowRowIndexs;

    //构造
    public CustomCellWriteHandler(Set<Integer> yellowRowIndexs) {
        this.yellowRowIndexs = yellowRowIndexs;
    }

    public CustomCellWriteHandler() {
    }

    @Override
    public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, 
Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
        LOGGER.info("beforeCellCreate~~~~");
    }

    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, 
        Head head, Integer relativeRowIndex, Boolean isHead) {
        LOGGER.info("afterCellCreate~~~~");
    }

    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, 
          Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
        // 这里可以对cell进行任何操作
        LOGGER.info("第{}行，第{}列写入完成。", cell.getRowIndex(), cell.getColumnIndex());
        if (CollectionUtils.isNotEmpty(yellowRowIndexs)) {
            Workbook workbook = writeSheetHolder.getSheet().getWorkbook();
            CellStyle cellStyle = workbook.createCellStyle();
            //字体
            Font cellFont = workbook.createFont();
            cellFont.setBold(true);
            cellStyle.setFont(cellFont);
            //标黄,要一起设置
            cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); //设置前景填充样式
            cellStyle.setFillForegroundColor(IndexedColors.YELLOW.getIndex());//前景填充色

            if (yellowRowIndexs.contains(cell.getRowIndex())) {
                cell.setCellStyle(cellStyle);
            }
        }
    }
}

二、测试方法

 /**
     * 写入到固定文件中,高亮显示某一行
     *
     * @throws IOException
     */
    @Test
    public void writeToExcelFile3() {
        //这里自定义一个单元格的格式(标黄的行高亮显示)
        Integer[] yellowRows = {3, 5, 7, 9};
        Set<Integer> yellowRowsSet = new HashSet<>(Arrays.asList(yellowRows));
        CustomCellWriteHandler customCellWriteHandler = new CustomCellWriteHandler(yellowRowsSet);

        //写入的文excel文件
        String fileName = "I:\temp\writeDemo3.xlsx";
        /*------------------------------分割线------------------------------*/
        //获取头和内容的策略
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = getHorizontalCellStyleStrategy();

        //列宽的策略,宽度是小单位
        Integer columnWidthArr[] = {3000, 3000, 2000, 6000};
        List<Integer> columnWidths = Arrays.asList(columnWidthArr);
        CustomSheetWriteHandler customSheetWriteHandler = new CustomSheetWriteHandler(columnWidths);

        // 根据自定义导出的字段
        String[] filds = {"uid", "name", "age", "birthday"};

        String[] headers = {"唯一识别码", "姓名", "年龄", "生日"};

        List head = getHeadByFilds(headers);

        //获取模拟的实体数据集合
        List<User> userList = getUserList();

        //这里指定头的名字去写入，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
        EasyExcel.write(fileName)
                .head(head)
                .registerWriteHandler(horizontalCellStyleStrategy)
                .registerWriteHandler(customSheetWriteHandler)
                //注册单元格式
                .registerWriteHandler(customCellWriteHandler)
                .includeColumnFiledNames(Arrays.asList(filds))
                .sheet("模板")
                .doWrite(userList);
    }

效果

三、自定义合并单元格的策略

/**
 * 自定义的合并策略,参考官方文档的LoopMergeStrategy
 */
public class MyMergeStrategy extends AbstractMergeStrategy {
    //合并坐标集合
    private List<CellRangeAddress> cellRangeAddresss;

    //构造
    public MyMergeStrategy(List<CellRangeAddress> cellRangeAddresss) {
        this.cellRangeAddresss = cellRangeAddresss;
    }

    /**
     * merge
     *
     * @param sheet
     * @param cell
     * @param head
     * @param relativeRowIndex
     */
    @Override
    protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
        //合并单元格
        /**
         *  ****加个判断:if (cell.getRowIndex() == 1 && cell.getColumnIndex() == 0) {}****
         * 保证每个cell被合并一次，如果不加上面的判断，因为是一个cell一个cell操作的，
         * 例如合并A2:A3,当cell为A2时，合并A2,A3，但是当cell为A3时，又是合并A2,A3，
         * 但此时A2,A3已经是合并的单元格了
         */

        if (CollectionUtils.isNotEmpty(cellRangeAddresss)) {
            if (cell.getRowIndex() == 1 && cell.getColumnIndex() == 0) {
                for (CellRangeAddress item : cellRangeAddresss) {
                    sheet.addMergedRegionUnsafe(item);
                }
            }
        }
    }
}

这里要加个 if (cell.getRowIndex() == 1 && cell.getColumnIndex() == 0) {} 判断条件,不然会报错,网友已经说明,可以验证一下~

四、测试合并

  /**
     * 模拟合并单元格的位置
     *
     * @return
     */
    private List<CellRangeAddress> getCellRangeAddresss() {
        List<CellRangeAddress> list = new ArrayList<>();
        //合并第4行
        CellRangeAddress item1 = new CellRangeAddress(3, 3, 0, 3);
        //合并第第6行的第一列和第二列
        CellRangeAddress item2 = new CellRangeAddress(5, 5, 0, 1);
        //合并第9行和第10行
        CellRangeAddress item3 = new CellRangeAddress(10, 11, 0, 3);

        list.add(item1);
        list.add(item2);
        list.add(item3);
        return list;

    }

  

/**
     * 写入到固定文件中,合并单元格
     *
     * @throws IOException
     */
    @Test
    public void writeToExcelFile4() {

        //定义合并单元格的坐标范围
        List<CellRangeAddress> cellRangeAddresss = getCellRangeAddresss();
        //定义合并单元格策略
        MyMergeStrategy myMergeStrategy = new MyMergeStrategy(cellRangeAddresss);

        //写入的文excel文件
        String fileName = "I:\temp\writeDemo4.xlsx";

        /*------------------------------分割线------------------------------*/
        //这里自定义一个单元格的格式(标黄的行高亮显示)
        Integer[] yellowRows = {3, 5, 7, 9};
        Set<Integer> yellowRowsSet = new HashSet<>(Arrays.asList(yellowRows));
        CustomCellWriteHandler customCellWriteHandler = new CustomCellWriteHandler(yellowRowsSet);

        //获取头和内容的策略
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = getHorizontalCellStyleStrategy();

        //列宽的策略,宽度是小单位
        Integer columnWidthArr[] = {3000, 3000, 2000, 6000};
        List<Integer> columnWidths = Arrays.asList(columnWidthArr);
        CustomSheetWriteHandler customSheetWriteHandler = new CustomSheetWriteHandler(columnWidths);

        // 根据自定义导出的字段
        String[] filds = {"uid", "name", "age", "birthday"};

        String[] headers = {"唯一识别码", "姓名", "年龄", "生日"};

        List head = getHeadByFilds(headers);

        //获取模拟的实体数据集合
        List<User> userList = getUserList();


        //这里指定头的名字去写入，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
        EasyExcel.write(fileName)
                .head(head)
                .registerWriteHandler(horizontalCellStyleStrategy)
                .registerWriteHandler(customSheetWriteHandler)
                //注册单元格式
                .registerWriteHandler(customCellWriteHandler)
                //注册合并策略
                .registerWriteHandler(myMergeStrategy)
                .includeColumnFiledNames(Arrays.asList(filds))
                .sheet("模板")
                .doWrite(userList);
    }

效果 (ps:加粗的合并区域边框是手动加上去看效果的)

五、总结

今天财务系统发布,产品和测试正在发版~正好有点空余时间好好利用~