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

## Ask the ActionContext

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

## Implement ServletResponseAware

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

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  It is more difficult to test Actions with runtime dependencies on HttpServletReponse. Only implement ServletResponseAware as a last resort. A better approach to solving a use case involving the response may be with a custom Result Type.

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