你的 SuperAction 类是否没有初始化 session 啊，看下面，在 setServletRequest() 有给session 辅助哦：

package action;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.interceptor.ServletResponseAware;

import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionSupport;

//所有Action动作的父类

public class SuperAction extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware {

/**

* 

*/

private static final long serialVersionUID = 7727505312022359301L;

protected HttpServletRequest request;  //请求对象

protected HttpServletResponse response;  //响应对象

protected HttpSession session;  //会话对象

protected ServletContext application;  // 全局对象

@Override

public void setServletContext(ServletContext application) {

this.application = application;

}

@Override

public void setServletResponse(HttpServletResponse response) {

this.response = response;

}

@Override

public void setServletRequest(HttpServletRequest request) {

this.request = request;

this.session = this.request.getSession();

}

}