logging - How to get value from a map stored on a httpsession when running on Tomcat -


with tomcat, possible dump pile of interesting information logfile configuring appropriate valve.

for example:

       <valve classname="org.apache.catalina.valves.accesslogvalve"          directory="logs"           prefix="localhost."          suffix=".txt"          pattern='%s %b %i %{myname}s'          resolvehosts="false"/>

means:

  • %s - output http status code of response
  • %b - output bytes sent,excluding http headers, or '-' if 0
  • %i - threadid

and %{myname}s meaning output value of attribute myname stored on session.

all good. if have hashmap stored on session, can output doing like:

%{mymap}s

see http://tomcat.apache.org/tomcat-5.5-doc/config/valve.html more info.

but, want output value specific key, not entire map. have tried:

%{mymap.myatt}s

but not work. ideas how this?

looking in source accesslogvalve, search string sessionattributeelement. value doing translate %{mymap}s string, , not can drill down map.

you extend class , override createaccesslogelement method add in handler different pattern (lets %{mymap.myatt}m), , handle logic in similar fashion sessionattributeelement class, split header session attribute name , map key.


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