首先引入相关依赖

 <!--解析office相关文件-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>
 <!--解析office相关文件-->

工具类

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

public class OfficeUtils {

    protected static final Logger logger = LoggerFactory.getLogger(OfficeUtils.class);

    public static Map<Integer, Map<Integer, Object>> readExcelContentz(MultipartFile file) throws Exception {
        Map<Integer, Map<Integer, Object>> content = new HashMap<Integer, Map<Integer, Object>>();
        // 上传文件名
        Workbook wb = getWb(file);
        if (wb == null) {
            throw new BusinessException(ErrorType.WORK_BOOK_EMPTY);
        }
        Sheet sheet = wb.getSheetAt(0);
        // 得到总行数
        int rowNum = sheet.getLastRowNum();
        Row row = sheet.getRow(0);
        int colNum = row.getPhysicalNumberOfCells();
        // 正文内容应该从第二行开始,第一行为表头的标题
        for (int i = 1; i <= rowNum; i++) {
            row = sheet.getRow(i);
            int j = 0;
            Map<Integer, Object> cellValue = new HashMap<Integer, Object>();
            while (j < colNum) {
                Object obj = getCellFormatValue(row.getCell(j));
                cellValue.put(j, obj);
                j++;
            }
            content.put(i, cellValue);

        }
        return content;
    }

    //根据Cell类型设置数据
    private static Object getCellFormatValue(Cell cell) {
        Object cellvalue = "";
        if (cell != null) {
            switch (cell.getCellTypeEnum()) {
                case NUMERIC:
                    cellvalue = String.valueOf(cell.getNumericCellValue());
                    break;
                case FORMULA: {
                    cellvalue = cell.getDateCellValue();
                    break;
                }
                case STRING:
                    cellvalue = cell.getRichStringCellValue().getString();
                    break;
                default:
                    cellvalue = "";
            }
        } else {
            cellvalue = "";
        }
        return cellvalue;
    }

    private static Workbook getWb(MultipartFile mf) {
        String filepath = mf.getOriginalFilename();
        String ext = filepath.substring(filepath.lastIndexOf("."));
        Workbook wb = null;
        try {
            InputStream is = mf.getInputStream();
            if (".xls".equals(ext)) {
                wb = new HSSFWorkbook(is);
            } else if (".xlsx".equals(ext)) {
                wb = new XSSFWorkbook(is);
            } else {
                wb = null;
            }
        } catch (FileNotFoundException e) {
            logger.error("FileNotFoundException", e);
        } catch (IOException e) {
            logger.error("IOException", e);
        }
        return wb;
    }
}

service层

public Map<Integer, Map<Integer,Object>> addCustomerInfo(MultipartFile file) {
    Map<Integer, Map<Integer,Object>> map = new HashMap<>();
    try {
        map = ReadExcelUtil.readExcelContentz(file);
    } catch (Exception e) {
        e.printStackTrace();
    }
    //excel数据存在map里，map.get(0).get(0)为excel第1行第1列的值，此处可对数据进行处理
}

controller层

@PostMapping
public String add(@RequestParam("file")MultipartFile file){
    Map<Integer, Map<Integer,Object>> map = customerService.addCustomerInfo(file);
    return "success";
}

至此，基本完成Excel的解析。