根据minio地址，下载文件流

下载文件转流一

public void downloadPdf(HttpServletResponse response) {
    try {
        String fileName = minioPdfConfig.getFileName();

        response.setContentType("application/pdf");
        response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
// 拼写文件下载信息
        String downloadApi = String.format(ChinaTowerApiConstants.FILE_DOWNLOAD,
                minioPdfConfig.getBucketName(), fileName);
// 下载文件并转成字节
        byte[] buffer = HttpUtil.downloadBytes(chinaTowerConfig.getMinioUrl() + downloadApi);

        // 清空response
        response.reset();
        try {
            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    } catch (Exception e) {
        e.printStackTrace();
        throw new BaseException(e.getMessage());
    }
}

下载文件转流2

    public void downloadPdf(HttpServletResponse httpServletResponse) throws IOException {
        RequestBody emptyRequestBody = RequestBody.create(null, new byte[0]);
        OkHttpClient okHttpClient = new OkHttpClient();
        String fileName = minioPdfConfig.getFileName();
        String downloadApi = String.format("/ChinatowerFile/download/%s/%s",
                minioPdfConfig.getBucketName(), fileName);
        // return chinaTowerConfig.getMinioUrl() + downloadApi;
        Request request = new Request.Builder().url(chinaTowerConfig.getMinioUrl()+downloadApi).post(emptyRequestBody).build();
        Response response = okHttpClient.newCall(request).execute();
        if(200 != response.code()){
            throw new BaseException("文件下载失败");
        }
        InputStream inputStream = response.body().byteStream();
        // 创建 ByteArrayOutputStream 用于收集所有读取的字节
        ServletOutputStream outputStream = httpServletResponse.getOutputStream();
        byte[] buffer = new byte[1024];
        int bytesRead;
        // 读取 InputStream 并写入 ByteArrayOutputStream
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
    }

直接返回url下载

    public String downloadPdf() {
        String fileName = minioPdfConfig.getFileName();
        String downloadApi = String.format("/ChinatowerFile/download/%s/%s",
                minioPdfConfig.getBucketName(), fileName);
        return chinaTowerConfig.getMinioUrl() + downloadApi;
    }