用httpRequestReponse  reponse 或者Servlet的HttpServletResponse response

reponse.getOutputStream()輸出給客戶端。

獲取response和request的方法：

HttpServletRequest request = ServletActionContext.getRequest();  
  
 ServletContext servletContext = ServletActionContext.getServletContext();  
  
 request.getSession();  
  
 HttpServletResponse response = ServletActionContext.getResponse();  

ActionContext ctx = ActionContext.getContext();

HttpServletRequest request = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);

參考：http://www.iteye.com/problems/94801

http://blog.csdn.net/superit401/article/details/77683893