文件下载始终是Knife4j.txt

项目依赖： `dependency group: 'com.github.xiaoymin', name: 'knife4j-spring-boot-starter', version: '3.0.2'`

下载代码：

```
//  下载代码：
 @GetMapping(value = "/download/{tableName}", produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
    @Operation(summary = "按表下载生成的代码模板信息")
    @ApiOperationSupport(order = 9900203)
    public void download(@PathVariable String tableName, HttpServletRequest req, HttpServletResponse resp) throws IOException {
        File file = new File(generatorService.generator(Arrays.asList(tableName)));
        String zipPath = file.getPath() + ".zip";
        ZipUtil.zip(file.getPath(), zipPath);
        FileUtils.downloadFile(req, resp, new File(zipPath), true);
    }

// FileUtils相关
   public static void downloadFile(HttpServletRequest request, HttpServletResponse response, File file,
                                    boolean deleteOnExit) {
        response.setCharacterEncoding(request.getCharacterEncoding());
        //1.设置文件ContentType类型，这样设置，会自动判断下载文件类型
        response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(file);
            response.addHeader("Content-Disposition", "attachment;filename=" + file.getName());
            IOUtils.copy(fis, response.getOutputStream());
            response.flushBuffer();
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                    if (deleteOnExit) {
                        file.deleteOnExit();
                    }
                } catch (IOException e) {
                    log.error(e.getMessage(), e);
                }
            }
        }
    }
```
已经全部按照FAQ中的说明进行设置，但是下载的时候显示的还是knife4j.txt，没有显示下载链接。浏览器直接请求显示正常。
异常信息如下：
![输入图片说明](https://images.gitee.com/uploads/images/2021/0205/181249_cb7e8fcf_5486.png "屏幕截图.png")

GVP 萧明/knife4j

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GVP萧明/knife4j

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