private boolean isBlankString(String pageSizeString) {
        if (pageSizeString == null) {
            return true;
        }

        return pageSizeString.trim().length() == 0;

    }
Determine if the string is blank

@param pageSizeString   pagesize value
@return result
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/web/common/BaseResult.java