Two ways to get the object of HttpServletRequest

In Struts 2 , you can use the following two methods to get the HttpServletRequest object.However

Struts 2 documentation is recommended second method ServletRequestAware instead of ServletActionContext.

1. ServletActionContext

Get the HttpServletRequest object directly from org.apache.struts2.ServletActionContext.

import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
 
public class LocaleAction{
 //business logic
 public String execute() {
  HttpServletRequest request = ServletActionContext.getRequest();
  return "SUCCESS";
 }
}

2. ServletRequestAware

Make your class implements the org.apache.struts2.interceptor.ServletRequestAware.

When Struts 2 ‘servlet-config‘ interceptor is seeing that an Action class is implemented theServletRequestAware interface, it will pass a HttpServletRequest reference to the requested Action class via the setServletRequest() method.

import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ServletRequestAware;
 
public class LocaleAction implements ServletRequestAware{
 
 HttpServletRequest request;
 
 //business logic
 public String execute() {
  String param = getServletRequest().getParameter("param");
  return "SUCCESS";
 
 }
 
 public void setServletRequest(HttpServletRequest request) {
  this.request = request;
 }
 
 public HttpServletRequest getServletRequest() {
  return this.request;
 }
}

Struts 2 documentation is recommended ServletRequestAware instead of ServletActionContext.

Reference : http://www.mkyong.com/struts2/how-to-get-the-httpservletrequest-in-struts-2/