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Apache Struts 2 Documentation
How can we access request parameters passed into an Action
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You can obtain the request parameters by asking the ActionContext or implementing ParameterAware. Implementing ParameterAware is preferred.

## Ask the ActionContext

The request parameters are available on the ActionContext instance, which is made available via ThreadLocal.

    Map parameters = ActionContext.getContext().getParameters();

## Implement HttpParametersAware

Preferred

- Ensure that `servlet-config` Interceptor is included in the Action's stack.
  - The default stack already includes `servlet-config`.
- Edit the Action so that it implements the HttpParametersAware interface.
  - The HttpParametersAware interface expects a `setParameters` method. You may wish to include a companion `getParameters` method.
- At runtime, call `getParameters` to obtain an object representing the request parameters.

When the `servlet-config` Interceptor sees that an Action implements ParameterAware, it passes a Map of the request parameters to the Action's `setParameters` method.

see struts-default.xml and org.apache.struts.action2.interceptor.Servlet Config Interceptor