easyexcel常见问题分析

news2025/4/25 6:59:51

文章目录

一、读取数字多了很多小数位的精度问题

一、读取数字多了很多小数位的精度问题

浮点型转成BigDecimal的时候会出现精度问题，例如
在这里插入图片描述
这儿设置的实体类对象类型是String，默认用到的是StringNumberConverter转换器
2.1.4 版本

public class StringNumberConverter implements Converter<String> {

    @Override
    public Class supportJavaTypeKey() {
        return String.class;
    }

    @Override
    public CellDataTypeEnum supportExcelTypeKey() {
        return CellDataTypeEnum.NUMBER;
    }

    @Override
    public String convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,
        GlobalConfiguration globalConfiguration) {
        // If there are "DateTimeFormat", read as date
        if (contentProperty != null && contentProperty.getDateTimeFormatProperty() != null) {
            return DateUtils.format(
                DateUtil.getJavaDate(cellData.getNumberValue().doubleValue(),
                    contentProperty.getDateTimeFormatProperty().getUse1904windowing(), null),
                contentProperty.getDateTimeFormatProperty().getFormat());
        }
        // If there are "NumberFormat", read as number
        if (contentProperty != null && contentProperty.getNumberFormatProperty() != null) {
            return NumberUtils.format(cellData.getNumberValue(), contentProperty);
        }
        // Excel defines formatting
        if (cellData.getDataFormat() != null) {
            if (DateUtil.isADateFormat(cellData.getDataFormat(), cellData.getDataFormatString())) {
                return DateUtils.format(DateUtil.getJavaDate(cellData.getNumberValue().doubleValue(),
                    globalConfiguration.getUse1904windowing(), null));
            } else {
            	// 直接返回NumberValue，对弈的类型为BigDecimal，因为BigDecimal由double转换而来
            	// 出现了精度读取的问题，所以此时直接读取NumberValue，精度不准确的时候多出很多小数点
            	// 这种情况不是必现的,613999.06是个例子
                return NumberUtils.format(cellData.getNumberValue(), contentProperty);
            }
        }
        // Default conversion number
        return NumberUtils.format(cellData.getNumberValue(), contentProperty);
    }

    @Override
    public CellData convertToExcelData(String value, ExcelContentProperty contentProperty,
        GlobalConfiguration globalConfiguration) {
        return new CellData(new BigDecimal(value));
    }
}

2.2.8 版本

public class StringNumberConverter implements Converter<String> {

    @Override
    public Class supportJavaTypeKey() {
        return String.class;
    }

    @Override
    public CellDataTypeEnum supportExcelTypeKey() {
        return CellDataTypeEnum.NUMBER;
    }

    @Override
    public String convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,
        GlobalConfiguration globalConfiguration) {
        // If there are "DateTimeFormat", read as date
        if (contentProperty != null && contentProperty.getDateTimeFormatProperty() != null) {
            return DateUtils.format(
                DateUtil.getJavaDate(cellData.getNumberValue().doubleValue(),
                    contentProperty.getDateTimeFormatProperty().getUse1904windowing(), null),
                contentProperty.getDateTimeFormatProperty().getFormat());
        }
        // If there are "NumberFormat", read as number
        if (contentProperty != null && contentProperty.getNumberFormatProperty() != null) {
            return NumberUtils.format(cellData.getNumberValue(), contentProperty);
        }
        // Excel defines formatting
        if (cellData.getDataFormat() != null && !StringUtils.isEmpty(cellData.getDataFormatString())) {
        	// 直接返回doubleValue，对弈的类型为double，转成String不会出现精度问题
            return NumberDataFormatterUtils.format(cellData.getNumberValue().doubleValue(), cellData.getDataFormat(),
                cellData.getDataFormatString(), globalConfiguration);
        }
        // Default conversion number
        return NumberUtils.format(cellData.getNumberValue(), contentProperty);
    }

    @Override
    public CellData convertToExcelData(String value, ExcelContentProperty contentProperty,
        GlobalConfiguration globalConfiguration) {
        return new CellData(new BigDecimal(value));
    }
}