Struts 2 mapping interceptors to action

Struts 2 developers are used to declare the actions belong to a package that extend the “

struts-default

“, which contains the default set of interceptors.

<package name="default" namespace="/" extends="struts-default">
<action name="testingAction"
class="com.mkyong.common.action.TestingAction" >
<result name="success">pages/result.jsp</result>
</action>
</package>

The default set of interceptors are grouped as “

defaultStack

” in

struts-default.xml

file, which is located in the

struts2-core.jar

file. The “

defaultStack

” provides all the core Struts 2 functionality, which is suit the need of most application.

Mapping interceptor to action

To map other interceptors to action, use the “

interceptor-ref

” element.

<package name="default" namespace="/" extends="struts-default">
<action name="testingAction"
class="com.mkyong.common.action.TestingAction" >
<interceptor-ref name="timer"/>
<interceptor-ref name="logger"/>
<result name="success">pages/result.jsp</result>
</action>
</package>

In above snippet code, it map the “

timer

” and “

logger

” interceptors to the “

TestingAction

” action class via “

interceptor-ref

” element.

The interceptors will fire in the order they’re declared.

Since the “

TestingAction

” is declared it’s own interceptors, it’s immediate loses all the inherit default set of interceptors, you must explicitly declare the “

defaultStack

” in order to use it, see below example.

<package name="default" namespace="/" extends="struts-default">
<action name="testingAction"
class="com.mkyong.common.action.TestingAction" >
<interceptor-ref name="timer"/>
<interceptor-ref name="logger"/>
<interceptor-ref name="defaultStack"/>
<result name="success">pages/result.jsp</result>
</action>
</package>