poi excel工具

导入excel返回List<List>
pom

		<!--处理2003 excel&ndash-->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>3.15</version>
		</dependency>
		<!--处理2007 excel&ndash-->
 
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
			<version>3.15</version>
		</dependency>

 /** 
    * @Description: excle转成list,指定表头几行
    * @Param:  
    * @return:   List<List<String>>
    * @Author: zzy 
    * @Date: 2019/10/15 
    */ 
    public static List<List<String>> getExcel(MultipartFile file,Integer tablehead){
        List<List<String>> list=new ArrayList<>();
        Workbook workbook=null;
        try {
            //得到Excel工作簿对象
            if(file.getOriginalFilename().endsWith("xlsx")){
                workbook=new XSSFWorkbook(file.getInputStream());
            }else {
                workbook = new HSSFWorkbook(file.getInputStream());
            }
            //得到Excel工作表对象
            Sheet sheet = workbook.getSheetAt(0);
            //得到Excel工作表的行
            for (int i=tablehead;i<=sheet.getLastRowNum();i++){
                Row row = sheet.getRow(i);
                 //第一列没有数据则跳过此行
                if(row.getCell(0)==null||!StringUtils.hasText(row.getCell(0).toString())){
                    continue;
                }
                List<String> cells=new ArrayList<>();
                //得到Excel工作表指定行的单元格
               for (int j = 0; j <= row.getLastCellNum(); j++) {
                    Cell cell = row.getCell(j);
                    if (cell != null) {
                        try {
                            cells.add(cell.getStringCellValue());
                        } catch (IllegalStateException e) {
                            long t = (long) cell.getNumericCellValue();
                            cells.add(t + "");
                        }
                    } else {
                        cells.add("");
                    }
                }
                list.add(cells);
            }
            return list;

        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }