Action classes and wildcards with special characters 2007-01-24 - By Elie Ciment
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Hi,
I am following along the tutorials online getting started with Struts2. I am
loving it, but I noticed something bazaar and was wondering what anyone has
to say about it.
When you have an action
<action name="Login" ....>
and you add an underscore or ! followed by an asterisk (*), to make it
<action name="Login_*" ...> or <action name="Login!*" ...>
then when you reference the url http://localhost:8080/myapp/Login.action -
why does the action Login_* get called? I would think that the underscore is
now needed in order to call this action!
Basically, now LoginXyz.action does not work, yet Login.action does - as
does Login_xyz.action (which is the only one that makes sense to me). So,
does the special character have any special teatment? If so, which
characters are teated specially aside from the ! and _ characters, and is
this documented anywhere?
Thanks for your help,
EC
-- The particular case was first brought to attention in the validation
section of the tutorial (
http://struts.apache.org/2.x/docs/validating-input.html). It was suggested
that if you do not wish to validate before there was any user input, add a
wildcard (*) after a special character to the action ("_" in the article,
but in my downloaded source for the blank struts2 app it was the "!"). That
would make it Login_* (or Login!*).
Whether I go to the Login.action or the Login_any-action-but-input.action it
works and validates, returning back to the page with the validation comment
(xyz is required etc). The question struck me: why does it work for
Login.action!!?? Thanks, again.
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