public ExcelReaderBuilder readCacheSelector(ReadCacheSelector readCacheSelector) {
        readWorkbook.setReadCacheSelector(readCacheSelector);
        return this;
    }
Select the cache.Default use {@link SimpleReadCacheSelector}

@param readCacheSelector
@return
fastexcel-core/src/main/java/cn/idev/excel/read/builder/ExcelReaderBuilder.java