@ResponseBody
@RequestMapping(value = "/DownLoadFile")
public void downLoadFile(String Id,HttpServletRequest request, HttpServletResponse response) throws Exception {
    CloseableHttpClient client = HttpClientBuilder.create().build();HttpGet get = new HttpGet("URL");
    String fileName = "baidu.jpg"
 
;
    String contentType = request.getSession().getServletContext().getMimeType(fileName);
    HttpResponse resp = client.execute(get);
    InputStream is = resp.getEntity().getContent();
    response.setContentType(contentType);
    response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=
 
\"" + fileName + "\"");
    OutputStream out = response.getOutputStream();
    byte[] bytes = IOUtils.toByteArray(is);
    out.write(bytes);
    out.flush();
    out.close();
    is.close();
    get.releaseConnection();
}