**Controller层**
@PostMapping("/excelupload")
public JsonResultEntity excelupload(@RequestParam("file") MultipartFile file) {
        return excelService.analysisExcel(file);
}

**Service层**
@Override
 public JsonResultEntity analysisExcel(MultipartFile file) {
        //获取文件名称
        String fileName = file.getOriginalFilename();
        if (StringUtils.isEmpty(fileName)){
            return new JsonResultEntity("","文件不能为空");
        }
        // 获取文件后缀
        String prefix=fileName.substring(fileName.lastIndexOf("."));
        if (!prefix.toLowerCase().contains("xls") && !prefix.toLowerCase().contains("xlsx") ) {
            return new JsonResultEntity("","文件格式异常，请上传Excel文件格式");
        }
        //Excel文件--得到Excel工作簿对象
        Map<String,Object> map = new HashMap<>();
        try {
            //兼容2003及2007
            boolean isExcel2003 = true;
            if (fileName.matches("^.+\\.(?i)(xlsx)$")) {
                isExcel2003 = false;
            }
            InputStream is = file.getInputStream();
            Workbook wb = null;
            if (isExcel2003) {
                wb = new HSSFWorkbook(is);
            } else {
                wb = new XSSFWorkbook(is);
            }
            Sheet sheet = wb.getSheetAt(0);
            int coloumNum = sheet.getRow(0).getPhysicalNumberOfCells();
            int rowNum = sheet.getLastRowNum();
            //XSSFRow row = null;
            List<String> list = new ArrayList<>();
            for (int i = 0; i < coloumNum; i++) {
                Row row = sheet.getRow(0);
                String string = row.getCell(i).toString();
                list.add(string);
            }
            map.put("colNum",rowNum);
            map.put("list",list);
            return new JsonResultEntity(map);
        } catch (IOException e) {
            e.printStackTrace();
            return new JsonResultEntity("","解析失败");
        }
    }