Java实现文件点击没反应的方法

Ext.Ajax.request({
url : '/yjy/training/TrainingTimeAction.do?method=downLoadAttchById',
params : {
timeId : timeids
},
success : function(response,options){
var result = Ext.util.JSON.decode(response.responseText);
Ext.Msg.alert("下载成功");
},
failure :function(response,options){
var result = Ext.util.JSON.decode(response.responseText);
Ext.Msg.alert("下载失败"+result.message);
}
});

String timeId = request.getParameter("timeId");
      String sql = "select doc_name from CPER.EHRTRAIN_item_DOCUMENT where item_id = ?";
      DbHelper dbHelper = new DbHelper();
      Object[] params = new Object[]{timeId};
      String fileName = (String)dbHelper.runSQLScalar(sql, params);
      String filePath = ServerPathUtil.getPathRoot()+"WEB-INF/cache/train_item_file/train_item_file_"+timeId+"/"+fileName;
      File file = new File(filePath);
      if(!file.exists()){
        logger.debug("文件不存在");
        throw new IOException("the file not exists");
      }
      response.setContentLength((int) file.length());
      OutputStream o = response.getOutputStream();
      byte b[] = new byte[5000];
      //response.setContentType("application/x-msdownload");
      response.setContentType("application/vnd.ms-excel");
      response.setContentLength((int)file.length());
      response.setHeader("Content-Disposition","attachment; filename="+fileName);
      FileInputStream in = new FileInputStream(file);
      int n; 
      while ((n = in.read(b)) != -1) {
        o.write(b, 0, n);
      }
      in.close();
    }catch(Exception e){
      e.printStackTrace();
    }

window.open('/yjy/training/TrainingTimeAction.do?method=downLoadAttchById&timeId=' + timeids);