I checked it a little, so I made a note. .. ..
--Mechanism for describing common processing of Servlet and jsp
--Automatically called before calling or terminating the Servlet
--Continued, if you want to call the next filter, call chain.doFilter ()
** → Rice At the last filter, the servlet is called **
--Create and use a class that implements the java.servlet.Filter interface --Methods that can be used (arguments are omitted because it will be long)
--java.servlet.FilterConfig interface --Specified in the argument of init () method --Used to get the parameters specified in web.xml --java.servlet.FilterChain interface --Specified in the argument of doFilter () method --Multiple filters are called (called filter chain)
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