/**     * 下载文件     * @param msg     */    public boolean printOutFile(String fileFullName,String fileName) {        if (fileFullName == null || "".equals(fileFullName)) {            return false;        }        File file=new File(fileFullName);        if(!file.exists()){            return false;        }        try {            HttpServletResponse response=ServletActionContext.getResponse();            response.setContentType("application/octet-stream");            response.addHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "UTF-8"));            response.addHeader("Content-Length", file.length()+"");            response.setContentLength(((Long)file.length()).intValue());                        ServletOutputStream os=response.getOutputStream();            FileInputStream fis=new FileInputStream(file);                        int size=0;            byte[] buffer=new byte[4096];            while((size=fis.read(buffer))!=-1){                os.write(buffer,0,size);            }            os.flush();            os.close();            fis.close();            return true;                    } catch (IOException e) {            e.printStackTrace();        }        return false;    }