java 使用poi导入Excel通用方法

需要的jar：

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<dependency>             <groupId>org.apache.poi</groupId>             <artifactId>poi-ooxml</artifactId>             <version>4.1.0</version> </dependency>

java代码：

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public static String importExcel(String filePath) throws Exception {        //判断文件        if (filePath != null && !"".equals(filePath)) {            File file = new File(filePath);            //判断格式            if (file.getName().endsWith(EXCEL_XLS) || file.getName().endsWith(EXCEL_XLSX)) {                //创建输入流对象                InputStream is = new FileInputStream(file);                Workbook workbook = null;                //判断excel版本号                if (file.getName().endsWith(EXCEL_XLS)) {                    workbook = new HSSFWorkbook(is);                } else if (file.getName().endsWith(EXCEL_XLSX)) {                    workbook = new XSSFWorkbook(is);                }                Map<String, Object> objectMap=new HashMap<>();                //循环表格（sheet）                for (int i = 0; i < workbook.getNumberOfSheets(); i++) {                    Sheet sheet = workbook.getSheetAt(i);                    //判断sheet是否有数据                    if (sheet.getPhysicalNumberOfRows() <= 0) {                        continue;                    }                    //存放集合                    List<Map<String, Object>> list = new ArrayList<>();                    //存放表头名字（第一行的数据）

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