Teacher teacher = (Teacher) request.getAttribute("teacher");
Teacher teacher = (Teacher) request.getSession().getAttribute("teacher");
	public void findExcelInfoByTecNum(HttpServletRequest request, HttpServletResponse response) {		Teacher teacher = (Teacher) request.getAttribute("teacher");		if(teacher == null) {			return;		}		List<ExcelInfo> infos = excelInfoService.findExcelByTecNum(teacher.getTecNum());		int total = SystemContext.getTotal();		if(total < 0) {			total = infos.size();		}		Map<String, Object> map = new HashMap<String, Object>();		map.put("total", total);		map.put("rows", infos);		JSONUtils.toJSON(map, response);	}