springboot 导出文件

@ResponseBody
@RequestMapping("/export")
public byte[] exportPhone(HttpServletResponse response) throws UnsupportedEncodingException {
    StringBuffer buff = new StringBuffer();
    List<User> users = userService.findAll();
    for (int i = 0; i < users.size(); i++) {
        buff.append(users.get(i).toString());
        buff.append("\r\n");
    }
    String fileName = "用户" + StringUtil.dateFormat("yyyy年MM月dd日HH时mm分ss秒", new Date()) + ".txt";
    fileName = URLEncoder.encode(fileName, "UTF-8");
    response.setContentType("application/octet-stream");
    response.setHeader("Content-disposition", "attachment;filename=" + fileName);
    return buff.toString().getBytes();
}