/**
 * 直接将excell输出到流
 */
@GetMapping("/download")
public void download(HttpServletResponse response) throws IOException {
    String fileName = java.net.URLEncoder.encode("新建文件.xlsx", "UTF-8");
    response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + fileName + "\"; filename*=utf-8''" + fileName);
    // 查询数据
    List<Student> students = studentService.list();

    new Workbook().addSheet(new ListSheet<>(students)).writeTo(response.getOutputStream()); // <- 直接写到Response流
}