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You can obtain the request parameters by asking the ActionContext or implementing ParameterAware. Implementing ParameterAware is preferred.
The request parameters are available on the ActionContext instance, which is made available via ThreadLocal.
Map parameters = ActionContext.getContext().getParameters();
Preferred
servlet-config Interceptor is included in the Action's stack.servlet-config.setParameters method. You may wish to include a companion getParameters method.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