清浏览器缓存，浏览器缓存,FacesContext

清浏览器缓存，浏览器缓存,FacesContext

FacesContext facesContext = FacesContext.getCurrentInstance();       HttpServletResponse response =   (HttpServletResponse)facesContext.getExternalContext().getResponse();       response.addHeader("Pragma", "no-cache");       response.addHeader("Cache-Control", "no-cache");       response.addHeader("Cache-Control", "no-store");       response.addHeader("Cache-Control", "private");       response.addHeader("Cache-Control", "must-revalidate");       response.addIntHeader("Expires", -1);//该片段来自于http://byrx.net