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();
  }

 }