@Override
    public BigDecimal convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty,
                                        GlobalConfiguration globalConfiguration) {
        if (cellData.getBooleanValue()) {
            return BigDecimal.ONE;
        }
        return BigDecimal.ZERO;
    }
Converts Excel cell data to Java type BigDecimal.
If the cell data represents true, returns BigDecimal.ONE, otherwise returns BigDecimal.ZERO.

@param cellData               Excel cell data.
@param contentProperty        Excel content property.
@param globalConfiguration    Global configuration.
@return                       Returns the converted BigDecimal object.
fastexcel-core/src/main/java/cn/idev/excel/converters/bigdecimal/BigDecimalBooleanConverter.java