Example tutorial on downloading js and modifying file name-JS Tutorial-php.cn

Example tutorial on downloading js and modifying file name

零下一度

Release： 2017-05-10 11:06:45

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This article mainly introduces the code for downloading files and modifying file names in detail js, which has certain reference value. Interested friends can refer to it

js to download the file, use the tag and add the download attribute.

var a = document.createElement("a");
a.href = "XXX.com/audioStream/8a9dbae9d0859e48fc1f590fcf6d4ccc.mp3"；
a.download ="test.mp3";
a.click();

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But if you want to rename the file, it seems that js cannot do it.

So consider the background implementation, use java proxy to request, get the file setting file name, and return to the front end.

public void downFiles(HttpServletResponse response,String url,String workInfoId,int type){
    try{
      String prefix = type == 1 ? "wav" : "txt";
      url = type == 1 ? url : (url + "?textInfoId="+workInfoId);
      HttpEntity entity = Request.Get(url).
          execute().returnResponse().getEntity();
      byte[] bys = EntityUtils.toByteArray(entity);
      //获取作品名称
      Works works = this.worksDao.findByWorkId(workInfoId);
      String name = (works!=null && StringUtils.isNotBlank(works.getName())) ? works.getName() : Long.toString(new Date().getTime());
      response.setHeader("Content-Disposition", "attachment; filename="+ new String(name.getBytes("utf-8"), "ISO-8859-1")+"."+prefix);
      OutputStream out = response.getOutputStream();
      out.write(bys);
      out.close();
    }catch (Exception e){
      e.printStackTrace();
    }

  }

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