The call of servlet and filter

Filter is created when the server starts.
servlet can only be created when it is called.
if you associate servlet with Filter by configuring web.xml,
then when accessing a specific servlet, you will first access the corresponding Filter

.

how can I associate filter with servlet if web.xml, is not configured?

Filter servlet
Mar.04,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bc95d3-2f6b7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bc95d3-2f6b7.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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