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  • Writing Interceptors

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Overwrite destroy to release resources on application shutdown.

Thread Safety

Notewarning

Interceptors must be thread-safe!

A Struts 2 Action instance is created for every request and do not need to be thread-safe. Conversely, Interceptors are shared between requests and must be thread-safe.

AbstractInterceptor

The AbstractInterceptor class provides an empty implementation of init and destroy, and can be used if these methods are not going to be implemented.

Mapping

TODO

Interceptors are declared using the interceptor element, nested inside the interceptors element. Example from struts-default.xml:

Code Block
XML
XML

<struts>
   ...

   <package name="struts-default">
      <interceptors>
         <interceptor name="alias" class="com.opensymphony.xwork2.interceptor.AliasInterceptor"/>
         <interceptor name="autowiring" class="com.opensymphony.xwork2.spring.interceptor.ActionAutowiringInterceptor"/>
         ...
      </interceptors>
   </package>

   ...
</struts>

Example

Assuming there is an action of type "MyAction", with a setDate(Date) method, this simple interceptor will set the date of the action to the current date:

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