struts2 action中获得HttpServletRequest四种方式

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package com.lk.struts;

import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
* @author Administrator
* 在action中获得HttpServletRequest四种方式
*/
public class Login extends ActionSupport implements ServletRequestAware,RequestAware{
private HttpServletRequest req1=null;
private HttpServletRequest req2=null;
private HttpServletRequest req3=null;
private HttpServletRequest req4=null;

public String execute(){
  HttpServletRequest req2 = ServletActionContext.getRequest();
  req4 = (HttpServletRequest) ActionContext.getContext().get(org.apache.struts2.StrutsStatics.HTTP_REQUEST);
  return "success";
}

public void setServletRequest(HttpServletRequest request) {
req1=request;
}

public void setRequest(Map<String, Object> request) {
req3 = (HttpServletRequest) request;
}

}