spring 后台项目实现文件流转发 思路

 InputStream stream = entity.getContent();
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len;
            while ((len = stream.read(buffer)) > -1) {
                byteArrayOutputStream.write(buffer, 0, len);
            }
            byteArrayOutputStream.flush();
            InputStream newStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());

byte[] buffer = new byte[inputStream.available()];
        inputStream.read(buffer);
        inputStream.close();
        response.reset();



        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
        toClient.write(buffer);
        toClient.flush();
        toClient.close();