<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>3.14</version>
</dependency>
<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi-ooxml</artifactId>
  <version>3.14</version>
</dependency>

HSSF － 提供讀寫Microsoft Excel XLS格式檔案的功能
XSSF － 提供讀寫Microsoft Excel OOXML XLSX格式檔案的功能
HWPF － 提供讀寫Microsoft Word DOC格式檔案的功能
HSLF － 提供讀寫Microsoft PowerPoint格式檔案的功能
HDGF － 提供讀Microsoft Visio格式檔案的功能
HPBF － 提供讀Microsoft Publisher格式檔案的功能
HSMF － 提供讀Microsoft Outlook格式檔案的功能

/**
 * 使用poi讀取表格數(shù)據(jù)
 * @throws Exception
 */
@Test
public void test1() throws Exception {
    // 1、加載指定的文件進(jìn)行讀取
    XSSFWorkbook excel = new XSSFWorkbook(new FileInputStream("C:\\Users\\zhong\\Desktop\\poi.xlsx"));
    // 2、讀取表格中的Sheet頁，通過索引決定
    XSSFSheet sheetAt = excel.getSheetAt(0);
    // 3、讀取Sheet頁中的行數(shù)據(jù)
    for (Row row : sheetAt) {
        // 4、讀取每一行數(shù)據(jù)的單元格數(shù)據(jù)（如果涉及到類型裝轉(zhuǎn)換的可能出現(xiàn)報錯消息，后期通過代碼進(jìn)行判斷即可）
        for (Cell cell : row) {
            System.out.print(cell+"   ");
        }
        System.out.println();
    }
    // 5、關(guān)閉讀取文件的流
    excel.close();
}

/**
 * 使用poi讀取文件的第二種方式
 * @throws Exception
 */
@Test
public void test2() throws Exception {
    // 1、加載指定的文件進(jìn)行讀取
    XSSFWorkbook excel = new XSSFWorkbook(new FileInputStream("C:\\Users\\zhong\\Desktop\\poi.xlsx"));
    // 2、讀取表格中的Sheet頁，通過索引決定
    XSSFSheet sheetAt = excel.getSheetAt(0);
    // 3、獲取當(dāng)前工作表中最后一個行號,注意行號是從0開啟的
    int lastRowNum = sheetAt.getLastRowNum();
    // 4、遍歷獲取到的行號
    for (int i = 0; i <= lastRowNum; i++) {
        // 5、根據(jù)行號獲取到每一行的數(shù)據(jù)
        XSSFRow row = sheetAt.getRow(i);
        // 6、獲取到當(dāng)前最后一個單元格索引
        short lastCellNum = row.getLastCellNum();
        // 7、遍歷當(dāng)前的單元格獲取到具體的數(shù)據(jù)
        for (int j = 0; j < lastCellNum; j++) {
            // 獲取到單元格的對象
            XSSFCell cell = row.getCell(j);
            // 輸出獲取到的數(shù)據(jù)
            System.out.print(cell + "   ");
        }
        System.out.println();
    }
    // 8、釋放資源
    excel.close();
}

/**
 * poi寫出數(shù)據(jù)到磁盤
 */
@Test
public void test3() throws Exception {
    // 1、創(chuàng)建工作簿
    XSSFWorkbook excel = new XSSFWorkbook();
    // 2、創(chuàng)建工作簿中的表對象
    XSSFSheet sheet = excel.createSheet("創(chuàng)建表");
    // 3、創(chuàng)建第一行（表頭）
    XSSFRow row1 = sheet.createRow(0);
    // 4、在行中創(chuàng)建單元格數(shù)據(jù)
    row1.createCell(0).setCellValue("姓名");
    row1.createCell(1).setCellValue("省份");
    row1.createCell(2).setCellValue("城市");
    row1.createCell(3).setCellValue("年齡");
    // 5、創(chuàng)建第二行
    XSSFRow row2 = sheet.createRow(1);
    // 6、創(chuàng)建第6行的數(shù)據(jù)
    row2.createCell(0).setCellValue("張三");
    row2.createCell(1).setCellValue("遼寧");
    row2.createCell(2).setCellValue("上海");
    row2.createCell(3).setCellValue("50");
    // 7、創(chuàng)建一個字節(jié)輸出流，將數(shù)據(jù)保存到本地
    FileOutputStream fileOutputStream = new FileOutputStream(new File("C:\\Users\\zhong\\Desktop\\aaa.xlsx"));
    excel.write(fileOutputStream);
    fileOutputStream.flush();
    // 8、關(guān)閉輸出
    excel.close();
    System.out.println("數(shù)據(jù)導(dǎo)出成功");
}

-- auto-generated definition
create table t_ordersetting
(
    id           int auto_increment
        primary key,
    orderDate    date null comment '約預(yù)日期',
    number       int  null comment '可預(yù)約人數(shù)',
    reservations int  null comment '已預(yù)約人數(shù)'
)
    charset = utf8;

public class OrderSetting implements Serializable{
    private Integer id ;
    private Date orderDate;//預(yù)約設(shè)置日期
    private int number;//可預(yù)約人數(shù)
    private int reservations ;//已預(yù)約人數(shù)

    public OrderSetting() {
    }

    public OrderSetting(Date orderDate, int number) {
        this.orderDate = orderDate;
        this.number = number;
    }
}

//下載模板文件
downloadTemplate(){
    window.location.href="../../template/ordersetting_template.xlsx" rel="external nofollow" ;
}

<el-upload action="/ordersetting/upload.do"
           name="excelFile"
           :show-file-list="false"
           :on-success="handleSuccess"
           :before-upload="beforeUpload">
    <el-button type="primary">上傳文件</el-button>
</el-upload>

// 上傳之前進(jìn)行文件格式校驗(yàn)
beforeUpload(file){
    const isXLS = file.type === 'application/vnd.ms-excel';
    if(isXLS){
        return true;
    }
    const isXLSX = file.type === 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
    if (isXLSX) {
        return true;
    }
    this.$message.error('上傳文件只能是xls或者xlsx格式!');
    return false;
},
// 上傳成功提示
handleSuccess(response, file) {
    if(response.flag){
        this.$message({
            message: response.message,
            type: 'success'
        });
    }else{
        this.$message.error(response.message);
    }
    console.log(response, file, fileList);
},

package com.zcl.utils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
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.springframework.web.multipart.MultipartFile;

public class POIUtils {
    private final static String xls = "xls";
    private final static String xlsx = "xlsx";
    private final static String DATE_FORMAT = "yyyy/MM/dd";
    /**
     * 讀入excel文件，解析后返回
     * @param file
     * @throws IOException
     */
    public static List<String[]> readExcel(MultipartFile file) throws IOException {
        //檢查文件
        checkFile(file);
        //獲得Workbook工作薄對象
        Workbook workbook = getWorkBook(file);
        //創(chuàng)建返回對象，把每行中的值作為一個數(shù)組，所有行作為一個集合返回
        List<String[]> list = new ArrayList<String[]>();
        if(workbook != null){
            for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
                //獲得當(dāng)前sheet工作表
                Sheet sheet = workbook.getSheetAt(sheetNum);
                if(sheet == null){
                    continue;
                }
                //獲得當(dāng)前sheet的開始行
                int firstRowNum  = sheet.getFirstRowNum();
                //獲得當(dāng)前sheet的結(jié)束行
                int lastRowNum = sheet.getLastRowNum();
                //循環(huán)除了第一行的所有行
                for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
                    //獲得當(dāng)前行
                    Row row = sheet.getRow(rowNum);
                    if(row == null){
                        continue;
                    }
                    //獲得當(dāng)前行的開始列
                    int firstCellNum = row.getFirstCellNum();
                    //獲得當(dāng)前行的列數(shù)
                    int lastCellNum = row.getPhysicalNumberOfCells();
                    String[] cells = new String[row.getPhysicalNumberOfCells()];
                    //循環(huán)當(dāng)前行
                    for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
                        Cell cell = row.getCell(cellNum);
                        cells[cellNum] = getCellValue(cell);
                    }
                    list.add(cells);
                }
            }
            workbook.close();
        }
        return list;
    }

    //校驗(yàn)文件是否合法
    public static void checkFile(MultipartFile file) throws IOException{
        //判斷文件是否存在
        if(null == file){
            throw new FileNotFoundException("文件不存在！");
        }
        //獲得文件名
        String fileName = file.getOriginalFilename();
        //判斷文件是否是excel文件
        if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
            throw new IOException(fileName + "不是excel文件");
        }
    }
    public static Workbook getWorkBook(MultipartFile file) {
        //獲得文件名
        String fileName = file.getOriginalFilename();
        //創(chuàng)建Workbook工作薄對象，表示整個excel
        Workbook workbook = null;
        try {
            //獲取excel文件的io流
            InputStream is = file.getInputStream();
            //根據(jù)文件后綴名不同(xls和xlsx)獲得不同的Workbook實(shí)現(xiàn)類對象
            if(fileName.endsWith(xls)){
                //2003
                workbook = new HSSFWorkbook(is);
            }else if(fileName.endsWith(xlsx)){
                //2007
                workbook = new XSSFWorkbook(is);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return workbook;
    }
    public static String getCellValue(Cell cell){
        String cellValue = "";
        if(cell == null){
            return cellValue;
        }
        //如果當(dāng)前單元格內(nèi)容為日期類型，需要特殊處理
        String dataFormatString = cell.getCellStyle().getDataFormatString();
        if(dataFormatString.equals("m/d/yy")){
            cellValue = new SimpleDateFormat(DATE_FORMAT).format(cell.getDateCellValue());
            return cellValue;
        }
        //把數(shù)字當(dāng)成String來讀，避免出現(xiàn)1讀成1.0的情況
        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
            cell.setCellType(Cell.CELL_TYPE_STRING);
        }
        //判斷數(shù)據(jù)的類型
        switch (cell.getCellType()){
            case Cell.CELL_TYPE_NUMERIC: //數(shù)字
                cellValue = String.valueOf(cell.getNumericCellValue());
                break;
            case Cell.CELL_TYPE_STRING: //字符串
                cellValue = String.valueOf(cell.getStringCellValue());
                break;
            case Cell.CELL_TYPE_BOOLEAN: //Boolean
                cellValue = String.valueOf(cell.getBooleanCellValue());
                break;
            case Cell.CELL_TYPE_FORMULA: //公式
                cellValue = String.valueOf(cell.getCellFormula());
                break;
            case Cell.CELL_TYPE_BLANK: //空值
                cellValue = "";
                break;
            case Cell.CELL_TYPE_ERROR: //故障
                cellValue = "非法字符";
                break;
            default:
                cellValue = "未知類型";
                break;
        }
        return cellValue;
    }
}

/**
 * 項(xiàng)目名稱：health_parent
 * 描述：預(yù)約管理控制器
 *
 * @author zhong
 * @date 2022-06-18 14:50
 */
@RestController
@RequestMapping("/ordersetting")
public class OrderSettingController {
    /**
     * 遠(yuǎn)程調(diào)用預(yù)約管理的服務(wù)接口
     */
    @Reference
    private OrderSettingService orderSettingService;

    /**
     * 文件上傳，實(shí)現(xiàn)預(yù)約管理的批量導(dǎo)入
     * @param excelFile
     * @return
     */
    @RequestMapping("/upload")
    public Result upload(@RequestParam("excelFile") MultipartFile excelFile){
        try {
            // 1、使用工具類解析上傳的數(shù)據(jù)
            List<String[]> list = POIUtils.readExcel(excelFile);
            // 將讀取的表格數(shù)據(jù)轉(zhuǎn)換為表格預(yù)約對象數(shù)據(jù)
            List<OrderSetting> data = new ArrayList<>();
            // 2、處理解析的數(shù)據(jù)
            for (String[] strings : list) {
                // 獲取到導(dǎo)入數(shù)據(jù)行的第一個單元格(預(yù)約時間)
                String orderSate = strings[0];
                // 獲取到導(dǎo)入數(shù)據(jù)行的第二個單元格（預(yù)約姓名）
                String number = strings[1];
                // 將重新獲取到的數(shù)據(jù)添加到預(yù)約集合中
                OrderSetting orderSetting = new OrderSetting(new Date(orderSate), Integer.parseInt(number));
                data.add(orderSetting);
            }
            // 2、通過dubbo遠(yuǎn)程調(diào)用服務(wù)實(shí)現(xiàn)數(shù)據(jù)批量導(dǎo)入到數(shù)據(jù)庫
            orderSettingService.add(data);

        } catch (IOException e) {
            e.printStackTrace();
            return new Result(false, MessageConstant.IMPORT_ORDERSETTING_FAIL);
        }
        return new Result(true, MessageConstant.IMPORT_ORDERSETTING_SUCCESS);
    }
}

package com.zcl.service.impl;

import com.alibaba.dubbo.config.annotation.Service;
import com.itheima.pojo.OrderSetting;
import com.zcl.dao.OrderSettingDao;
import com.zcl.service.OrderSettingService;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * 項(xiàng)目名稱：health_parent
 * 描述：預(yù)約管理接口實(shí)現(xiàn)類
 *
 * @author zhong
 * @date 2022-06-18 15:09
 */
@Service(interfaceClass = OrderSettingService.class)
@Transactional
public class OrderSettingImpl implements OrderSettingService {
    /**
     * 注入保存數(shù)據(jù)
     */
    @Autowired
    private OrderSettingDao orderSettingDao;

    /**
     * 批量上傳業(yè)務(wù)實(shí)現(xiàn)
     * @param data
     */
    @Override
    public void add(List<OrderSetting> data) {
        // 判斷集合數(shù)據(jù)是否為空
        if(data != null && data.size() > 0){
            // 判斷當(dāng)前日期是否已經(jīng)進(jìn)行了預(yù)約設(shè)置
            for (OrderSetting datum : data) {
                // 根據(jù)日期查詢預(yù)約消息
                long count = orderSettingDao.findCountByOrderDate(datum.getOrderDate());
                if(count > 0){
                    // 已進(jìn)行預(yù)約管理，執(zhí)行更新操作
                    orderSettingDao.editNumberByOrderDate(datum);
                }else{
                    // 添加預(yù)約設(shè)置
                    orderSettingDao.add(datum);
                }
            }
        }else{

        }
    }
}

package com.zcl.dao;

import com.itheima.pojo.OrderSetting;

import java.util.Date;

/**
 * 項(xiàng)目名稱：health_parent
 * 描述：預(yù)約管理數(shù)據(jù)訪問層
 *
 * @author zhong
 * @date 2022-06-18 15:13
 */
public interface OrderSettingDao {
    /**
     * 添加預(yù)約數(shù)據(jù)
     * @param orderSetting
     */
    void add(OrderSetting orderSetting);

    /**
     * 修改預(yù)約數(shù)據(jù)
     * @param orderSetting
     */
    void editNumberByOrderDate(OrderSetting orderSetting);

    /**
     * 查詢預(yù)約數(shù)據(jù)的總數(shù)
     * @param orderDate
     * @return
     */
    long findCountByOrderDate(Date orderDate);
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zcl.dao.OrderSettingDao">
    <!--添加預(yù)約嘻嘻嘻-->
    <insert id="add" parameterType="com.itheima.pojo.OrderSetting">
        insert into t_ordersetting (orderDate,number,reservations)
        values (#{orderDate},#{number},#{reservations});
    </insert>

    <!--根據(jù)日期修改預(yù)約信息-->
    <update id="editNumberByOrderDate" parameterType="com.itheima.pojo.OrderSetting">
        update t_ordersetting
        set number = #{number}
        where orderDate = #{orderDate}
    </update>

    <!--根據(jù)日期查詢數(shù)據(jù)-->
    <select id="findCountByOrderDate" parameterType="date" resultType="java.lang.Long">
        select count(id)
        from t_ordersetting
        where orderDate = #{orderDate}
    </select>
</mapper>