public int getPreviousPage() {
        int back = this.getCurrentPage().intValue() - 1;

        if (back <= 0) {
            back = 1;
        }

        return back;
    }
Get default page size.

@return Returns the defaultPageSize.
inlong-tubemq/tubemq-server/src/main/java/org/apache/inlong/tubemq/server/master/web/common/BaseResult.java