Struts2的Action中获取ServletActionContext.getPageContext()==null


package com.InteriorDesign.action;import javax.servlet.ServletConfig;
import javax.servlet.jsp.PageContext;import org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.springframework.stereotype.Component;import com.opensymphony.xwork2.ActionSupport;@SuppressWarnings("serial")
@Component("forwardAction")
public class ForwardAction extends ActionSupport {

private Logger logger=Logger.getLogger(ForwardAction.class);

public String execute(){
   logger.info("============");
   
   logger.info(ServletActionContext.getResponse()==null);
   
   logger.info(ServletActionContext.getPageContext()==null);
   
   logger.info(ServletActionContext.getPageContext().getServletConfig()==null);
   
   return "success";
}

}
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception java.lang.NullPointerException
com.InteriorDesign.action.ForwardAction.execute(ForwardAction.java:25)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
请问各位大侠有知道如何获取PageContext对象的吗？谢谢