js下载文件并修改文件名

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

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();    }  }