if(total <= 0) { total = studentList.size(); }
	public void findByFactor(String json, HttpServletResponse response) {		@SuppressWarnings("unchecked")		List<Factor> factors = (List<Factor>) JSONUtils.json2Obj(json, Factor.class);		List<Student> studentList = studentInfoService.findStudentByFactor(factors);		Map<String, Object> map = new HashMap<String, Object>();		int total = SystemContext.getTotal();		map.put("total", total);		map.put("rows", studentList);		JSONUtils.toJSON(map, response);	}