阿里开源Easy-Excel单元格样式调整

最近项目需要导出Excel, 而且Excel的表头不固定, 还涉及表头合并和样式调整, 以及某些列需要千位分隔符和百分比, 在Github上找到了阿里开源的Easy-Excel

引入依赖

    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>easyexcel</artifactId>
        <version>1.1.2-beta5</version>
    </dependency>

定义需要导出的类

@ExcelProperty注解式用来标记字段在Excel中的表头, value值支持多级表头, 用一级表头一致框架自动会对表头进行合并, index是用来标记字段在Excel中的顺序(不是Excel中的位置), 因为项目实际需求中有几个字段是可选导出的, 所以index没有设置成连续的; 其次, 导出的字段中总量要求有千位分隔符, 两个满足率字段要求有百分号, 因此需要单独设置单元格样式

@EqualsAndHashCode(callSuper = true)
@Data
@Accessors(chain = true)
public class BasePurchaseExecutionResponse extends BaseRowModel {

    /**
     * 序号
     */
    @ExcelProperty(value = {"", "", "序号"}, index = 0)
    private String num;
    /**
     * 供应商类型
     */
    @ExcelProperty(value = {"", "", "供应商类型"}, index = 1)
    private String supplierType;
    /**
     * 品牌
     */
    @ExcelProperty(value = {"", "", "品牌"}, index = 2)
    private String brandNameListString;

    /**
     * 年份
     */
    @ExcelProperty(value = {"", "", "年份"}, index = 3)
    private String productYear;
    /**
     * 产品季节
     */
    @ExcelProperty(value = {"", "", "产品季节"}, index = 4)
    private String productSeason;
    /**
     * 总量
     */
    @ExcelProperty(value = {"", "", "总量"}, index = 9)
    private int totalShipment;
    /**
     * 计划交期满足率
     */
    @ExcelProperty(value = {"", "", "计划交期满足率"}, index = 10)
    private String planDeliverRate;
    /**
     * 确认交期满足率
     */
    @ExcelProperty(value = {"", "", "确认交期满足率"}, index = 11)
    private String confirmDeliverRate;

}

写一个样式类实现Easy-Excel提供的WriteHandler接口

/**
 * @author Eric on 2019/4/5.
 * @version 1.0
 */
public class StyleExcelHandler implements WriteHandler {

    @Override
    public void sheet(int i, Sheet sheet) {
    }

    @Override
    public void row(int i, Row row) {
    }

    @Override
    public void cell(int i, Cell cell) {
        // 从第二行开始设置格式，第一行是表头
        Workbook workbook = cell.getSheet().getWorkbook();
        CellStyle cellStyle = createStyle(workbook);
        if (cell.getRowIndex() > 2) {
            if (i == 5) {
                DataFormat dataFormat = workbook.createDataFormat();
                // 设置千位分隔符
                cellStyle.setDataFormat(dataFormat.getFormat("#,##0"));
            }
            if (i == 7 || i == 6) {
                String stringCellValue = cell.getStringCellValue();
                cell.setCellValue(new BigDecimal(stringCellValue.replaceAll("%", "")).divide(new BigDecimal(100), 8, BigDecimal.ROUND_HALF_UP).setScale(4, BigDecimal.ROUND_HALF_UP).doubleValue());
                // 设置百分比
                cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat("0.00%"));
            }
            if (i == 0 || i == 3) {
                cell.setCellValue(Long.parseLong(cell.getStringCellValue()));
            }
        }
        cell.getRow().getCell(i).setCellStyle(cellStyle);
    }

    /**
      * 实际中如果直接获取原单元格的样式进行修改, 最后发现是改了整行的样式, 因此这里是新建一个样* 式
      */
    private CellStyle createStyle(Workbook workbook) {
        CellStyle cellStyle = workbook.createCellStyle();
        // 下边框
        cellStyle.setBorderBottom(BorderStyle.THIN);
        // 左边框
        cellStyle.setBorderLeft(BorderStyle.THIN);
        // 上边框
        cellStyle.setBorderTop(BorderStyle.THIN);
        // 右边框
        cellStyle.setBorderRight(BorderStyle.THIN);
        // 水平对齐方式
        cellStyle.setAlignment(HorizontalAlignment.CENTER);
        // 垂直对齐方式
        cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
        return cellStyle;
    }
}

写一个测试类

@Test
public void test3() throws IOException {
        StyleExcelHandler handler = new StyleExcelHandler();
        OutputStream outputStream = new FileOutputStream("D://2007.xlsx");
        // 这里要把上面创建的样式类通过构造函数传入
        ExcelWriter writer = new ExcelWriter(null, outputStream, ExcelTypeEnum.XLSX, true, handler);
        Sheet sheet1 = new Sheet(1, 1, BasePurchaseExecutionResponse.class, "含供应商和地区", null);
        sheet1.setAutoWidth(true);
        writer.write(createResponseList(), sheet1);
        writer.finish();
        outputStream.close();
}

/**
 * 创建数据集合
 *
 * @return
 */
private List<? extends BaseRowModel> createResponseList() {
    List<BasePurchaseExecutionResponse> responses = new ArrayList<>();
    for (int i = 1; i <= 10; i++) {
        BasePurchaseExecutionResponse response = new BasePurchaseExecutionResponse().setTotalShipment(i * 1000000)
                .setConfirmDeliverRate(i + "%").setAddiOtherNum(i * 100000)
                .setNum(String.valueOf(i)).setProductSeason("冬").setProductYear("19")
                .setSupplierType("本厂").setBrandNameListString("耐特")
                .setPlanDeliverRate(i * 2 + "%");
        responses.add(response);
    }
    return responses;
}

不足之处

1. 样式的设置可维护性太差, 通过在样式类中硬编码各个列号对应的样式确实不好, 问题点在于, 单元格样式的创建需要workbook对象实例才可以, 框架本身并没有提供获取workbook的方法, 因此, 如果想要在其他地方设置样式的话, 可以通过反射的方式来获取workbook对象

导出的Excel