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);