java导出Excel问题

为什么我用Java导出Excel表的时候会启动迅雷，我不想启动迅雷，想直接文件另存为...是不是代码的关系            File file = new File(resultPath);
            HttpServletResponse response = super.getResponse();

            InputStream fis = new BufferedInputStream(new FileInputStream(file));   
            byte[] buffer = new byte[fis.available()];   
            fis.read(buffer);   
            fis.close();   
            // 清空response   
            response.reset();   
            // 设置response的Header
            response.setCharacterEncoding("UTF-8"); 
            String fileName = URLEncoder.encode(file.getName(), "UTF-8"); 
response.addHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes()));   
            response.addHeader("Content-Length", "" + file.length());
            response.setContentType("application/ms-excel");
            OutputStream os = response.getOutputStream();   
            
            
            os.write(buffer);   
            os.flush();   
            os.close();