java根据链接下载pdf文件到前台

废话不多说，上代码.

controller层：

    //点击下载pdf 
    @RequestMapping(value = "/downloadPdfSDS",method = RequestMethod.GET)
    @ResponseBody
    public Object download(@RequestParam String urls) throws IOException {
        System.out.println(urls);
        Map map = productPdfService.DownloadSDS(urls);
        Object path = map.get("path");
        Object catalogNo = map.get("catalogNo");
        String downloadUrl = String.valueOf(path);
        URL url = new URL (downloadUrl);//超链接路径 例如 https://file.leyan.com/proPdf/1199258/76410-58-7-S-2-Amino-3-4-boronopheny-COA-Le070578729-Leyan.pdf
        URLConnection uc = url.openConnection();
        final HttpHeaders headers = new HttpHeaders();//设置头信息
        headers.add("Content-Type", "application/pdf");
        headers.add("Content-Disposition", "attachment; filename="+catalogNo+"-SDS"+".pdf");
        return new ResponseEntity<>(IOUtils.toByteArray(uc.getInputStream()), headers, HttpStatus.OK);
    }

前端：

 下载

js：

https://blog.csdn.net/tao111369/article/details/84308917

https://www.jianshu.com/p/40d8388761f3