java file download

@RestController
@RequestMapping("api")
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class DownloadApi {

    @RequestMapping("/download")
    @ResponseBody
    public void download(HttpServletResponse response) {
        String filename = "文件名称.txt";
        String content = "文件内容";
        try (ServletOutputStream outStr = response.getOutputStream();
             BufferedOutputStream buff = new BufferedOutputStream(outStr)) {
            response.setCharacterEncoding("UTF-8");
            // 设置响应的内容类型
            response.setContentType(MediaType.TEXT_PLAIN_VALUE);
            // 设置文件的名称和格式
            response.setHeader("Content-Disposition", "attachment;filename=" +
                    new String(filename.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1));
            buff.write(content.getBytes(StandardCharsets.UTF_8));
            buff.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}