struts2谷歌下载文件报错

struts2谷歌下载文件报错，但是IE能正常下载,有没有解决方法
filename名字为abc.xlsx

public InputStream getDownloadFile() {
  try{
   InputStream is=ServletActionContext.getServletContext().getResourceAsStream(getUrl());
   return is;
  } catch(Exception e) {
   Log.log(e);
   e.printStackTrace();
   return null;
  }
 }
 
 public String downloadFTP() {
  try {
   
   setUrl("Ftp/" + getFilename());
   System.out.print(filename);
   ServletActionContext.getResponse().setHeader("Content-Disposition",
     "attachment;fileName=\""+new String(filename.getBytes(),"ISO8859-1")+"\"");
   if(getDownloadFile() != null) {
    return SUCCESS;
   } else {
    throw new Exception("下载流为NULL！");
   }
  } catch(FileNotFoundException e) {
   Log.log(e);
   e.printStackTrace();
   setMsg("提示:下载目标文件不存在！文件路径：" + e.getMessage());
   return ERROR;
  } catch(Exception e) {
   Log.log(e);
   e.printStackTrace();
   setMsg("提示：" + e.getMessage());
   return ERROR;
  }
 }

上个世纪的技术，还有项目用呢