default T convertToJavaData(ReadCellData<?> cellData, ExcelContentProperty contentProperty,
                                GlobalConfiguration globalConfiguration) throws Exception {
        throw new UnsupportedOperationException("The current operation is not supported by the current converter.");
    }
Convert excel objects to Java objects

@param cellData            Excel cell data.NotNull.
@param contentProperty     Content property.Nullable.
@param globalConfiguration Global configuration.NotNull.
@return Data to put into a Java object
@throws Exception Exception.
fastexcel-core/src/main/java/cn/idev/excel/converters/Converter.java