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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.

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

...

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 ParameterAware HttpParametersAware interface.
- The ParameterAware HttpParametersAware interface expects a setParameters method. You may wish to include a companion getParameters method.
At runtime, call getParameters to obtain a Map an object representing the request parameters.

...

Info
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.

Tip
To unit test a ParameterAware Action, create your own Map with the pertinent request parameters and call `setParameters` as part of the test's `setUp` method.

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