java 文件下载

 

private void downloadFile(HttpServletResponse httpServletResponse, String fileName, String filePath) {

        File file = new File(filePath);

        InputStream inputStream = null;
        OutputStream outputStream = null;

        byte[] bytes = new byte[1024];

        try {
            inputStream = new FileInputStream(file);
            httpServletResponse.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            outputStream = httpServletResponse.getOutputStream();
            int i;
            while ((i = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, i);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                assert outputStream != null;
                outputStream.close();
                inputStream.close();
            } catch (Exception e) {
                e.printStackTrace();
            }

        }

    }
参考https://blog.youkuaiyun.com/weixin_40467684/article/details/91885440