THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
| Info |
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The example code for this tutorial, |
| Wiki Markup |
| {info}The example code for this tutorial, Wildcard_Method_Struts2_Ant or Wildcard_Method_Struts2_Mvn, is available on Code - http://code.google.com/p/struts2-examples/downloads/list After downloading and unzipping the file, you'll have a folder named Wildcard_Method_Struts2_Ant (or Wildcard_Method_Struts2_Mvn). In that folder will be a README.txt file with instructions on now to build and run the example application. {info} h3. Introduction In this tutorial |
Introduction
In this tutorial we'll
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cover
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how
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to
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configure
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an
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action
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node
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in
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the
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struts.xml
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configuration
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file
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so
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that
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one
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action
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node
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can
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be
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used
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to
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relate
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several
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different
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Action
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URLs
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to
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specific
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methods
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of
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the
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Action
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class.
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This
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will
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reduce
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the
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number
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of
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action
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nodes
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we
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must
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write
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in
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the
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struts.xml
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configuration
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file.
| Tip |
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| } The [ |http://struts.apache.org/mail.html]is an excellent place to get help. If you are having a problem getting the tutorial example applications to work search the Struts 2 mailing list. If you don't find an answer to your problem, post a question on the mailing list. {tip} h3. Example Application The example application that supports this tutorial |
Example Application
The example application that supports this tutorial (Wildcard_Method_Struts2
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available
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at
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http://code.google.com/p/struts2-examples/downloads/list
.)
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shows
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how
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to
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use
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Struts
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2's
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wildcard
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method
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selection
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methodology.
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The
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example
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application
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is
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just
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a
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simple
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one
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that
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lists
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some
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people
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and
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lets
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you
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edit
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them,
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delete
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them,
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and
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add
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a
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new
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person
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to
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the
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list.
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Everything
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that
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the
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application
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needs
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to
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do
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with
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a
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Person
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(the
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model
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class)
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is
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controlled
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by
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the
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Struts
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2
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ActionSupport
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class
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PersonAction.
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The
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PersonAction
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class
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has
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several
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different
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methods
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(e.g.
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create,
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edit,
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delete)
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that
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are
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called
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depending
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on
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what
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the
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user
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wants
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to
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do.
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Wildcard
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Method
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Selection
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Without
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using
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the
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wildcard
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method
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selection
...
technique,
...
I'd
...
have
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to
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write
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an
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action
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mapping
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node
...
in
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the
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Struts
...
2
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configuration
...
file
...
for
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each
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separate
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action
...
I'd
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want
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to
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call.
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For
...
example:
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} <action name="createPerson" class="org.apache.struts.tutorials.wildcardmethod.action.PersonAction" method="create"> <result name="input">input.jsp</result> <result name="success">view.jsp</result> </action> <action name="editPerson" class="org.apache.struts.tutorials.wildcardmethod.action.PersonAction" method="edit"> <result name="input">input.jsp</result> <result name="success">view.jsp</result> </action> {code} |
So
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even
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for
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this
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simple
...
application,
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I'd
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have
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to
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write
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four
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separate
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action
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mapping
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nodes
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(create,
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edit,
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delete,
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saveOrUpdate)
...
in
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the
...
configuration
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file.
...
So
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you
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can
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easily
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see
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that
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a
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more
...
complex
...
application
...
can
...
have
...
dozens
...
of
...
action
...
mapping
...
nodes.
...
To
...
implement
...
the
...
wildcard
...
method
...
selection
...
technique
...
to
...
enable
...
the
...
Struts
...
2
...
framework
...
to
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dynamically
...
select
...
the
...
correct
...
method
...
to
...
call
...
at
...
runtime
...
you
...
just
...
need
...
to
...
use
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the
...
wildcard
...
character,
...
*,
...
in
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your
...
name
...
value
...
and
...
an
...
attribute
...
value
...
place
...
holder
...
(
...
{1
...
}
...
)
...
for
...
the
...
method
...
value.
...
For
...
example:
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} <action name="*Person" class="org.apache.struts.tutorials.wildcardmethod.action.PersonAction" method="{1}"> <result name="success">view.jsp</result> <result name="input">input.jsp</result> </action> {code} |
The
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*
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is
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the
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wildcard
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character.
...
Any
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action
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name
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values
...
that
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end
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in
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"Person"
...
will
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be
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handled
...
by
...
this
...
action
...
mapping.
...
Whatever
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value
...
is
...
before
...
"Person"
...
will
...
be
...
the
...
value
...
used
...
for
...
the
...
method
...
attribute
...
(the
...
{1}
...
place
...
holder
...
will
...
be
...
replaced
...
with
...
that
...
value).
...
For
...
example
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this
...
URL:
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http://localhost:8080/Wildcard_Method_Struts_2_Mvn/createPerson.action
...
will
...
be
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be
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processed
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by
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the
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the
...
above
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action
...
mapping
...
and
...
method
...
create
...
of
...
class
...
action.PersonAction
...
will
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be
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called.
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While
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this
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URL
http://localhost:8080/Wildcard_Method_Struts_2_Mvn/deletePerson.action
...
will
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cause
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the
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delete
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method
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of
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class
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action.PersonAction
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to
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be
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called.
...
What
...
happens
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if
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we
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have
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a
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URL
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with
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nothing
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in
...
front
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of
...
Person?
...
For
...
example:
...
http://localhost:8080/Wildcard_Method_Struts_2_Mvn/Person.action
...
If
...
there
...
is
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no
...
value
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in
...
front
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of
...
Person,
...
then
...
the
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Struts
...
2
...
framework
...
will
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call
...
the
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execute
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method
...
of
...
the
...
class
...
action.PersonAction.
...
Dynamic
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Method
...
Invocation
...
The
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wildcard
...
method
...
selection
...
technique
...
explained
...
above
...
should
...
not
...
be
...
confused
...
with
...
the
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"Dynamic
...
Method
...
Invocation"
...
technique.
...
The
...
Struts
...
2
...
documentation
...
explains
...
this
...
technique
...
(which
...
uses
...
the
...
bang,
...
!,
...
operator
...
in
...
the
...
action
...
name)
...
and
...
recommends
...
against
...
using
...
the
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"Dynamic
...
Method
...
Invocation"
...
technique
...
due
...
to
...
security
...
and
...
other
...
reasons
...
related
...
to
...
how
...
this
...
technique
...
is
...
implemented
...
internally.
...
The
...
Struts
...
2
...
documentation
...
also
...
recommends
...
turning
...
off
...
the
...
option
...
to
...
use
...
the
...
dynamic
...
method
...
invocation
...
by
...
setting
...
struts.enable.DynamicMethodInvocation
...
to
...
FALSE
...
in
...
the
...
Struts
...
configuration.
...
Summary
By using the wildcard method selection technique explained above, you can significantly reduce the number of action mapping nodes you need to write and manage in the Struts 2 XML configuration file.