//调用封装好的工具
ExcelImportUtil importUtil = new ExcelImportUtil(file);
//调用导入的方法，获取sheet表的内容
List<Map<String, String>> maps = importUtil.readExcelContent();


FileInputStream fileInputStream = IoUtil.toStream(file);
BufferedReader reader = IoUtil.getReader(fileInputStream, "UTF-8");
Stream<String> lines = reader.lines();