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Apache Struts 2 Documentation
How can we access the HttpServletRequest
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You can obtain the request by asking the ActionContext or implementing ServletRequestAware. Implementing ServletRequestAware is preferred.

## Ask the ActionContext

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

## Implement ServletRequestAware

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 ServletRequestAware interface.
  - The ServletRequestAware interface expects a `setServletRequest` method. You may wish to include a companion `getServletRequest` method.
- At runtime, call `getServletRequest` to obtain a reference to the request object.
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  When the `servlet-config` Interceptor sees that an Action implements ServletRequestAware, it passes a reference to the request the Action's `setServletRequest` method.

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  It is more difficult to test Actions with runtime dependencies on HttpServletRequest. Only implement ServletRequestAware as a last resort. If the use case cannot be solved by one of the other `servet-config` interfaces (ApplicationAware, SessionAware, ParameterAware), consider whether an custom Interceptor could be used instead of Action code. (Review how `servlet-config` works for examples of what can be done.)

  @see struts-default.xml
  @see org.apache.struts.action2.interceptor.ServletRequestAware
  @see org.apache.struts.action2.interceptor.ServletConfigInterceptor