如何在Spring Boot中如何返回InputStream时采用文件的模式呢？

实现思路:
    返回时,加入参数HttpServletResponse即可

注意事项:
    这种方式，就可以返回任意类型格式的数据至客户端
	pdf,excel,json,html等等

 
 public static void sendFileInResponse (HttpServletResponse response, InputStream inputStream) throws IOException {
    response.setContentType("your_content_type");
    response.setHeader("Content-Disposition", "inline;filename=your_file_name");
    OutputStream outputStream = response.getOutputStream();
    byte[] buff = new byte[2048];
    int length = 0;
    while ((length = inputStream.read(buff)) > 0) {
        outputStream.write(buff, 0, length);
        outputStream.flush();
    }
    outputStream.close();
    inputStream.close();
    response.setHeader("Cache-Control", "private");
    response.setDateHeader("Expires", 0);
}