Java | SpringBoot+Mybatis+poi+Thymeleaf实现excel文件数据导入到数据库以及从数据库将数据导出成excel（详细）

这个项目中excel版本需要是2007+版本，该程序在office 2016上测试通过，导出的excel文件后缀是.xls，导入的excel文件后缀是.xlsx

一、dependencies（Maven依赖）

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!--thymeleaf-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
            <version>2.2.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>
    </dependencies>

二、application.properties（核心配置文件）

#修改端口号
server.port=8888
#定义项目的访问目录
server.servlet.context-path=/springboot
####MyBatis配置
#数据库驱动
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#数据库连接地址
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/excel?characterEncoding=utf8
#数据库用户名
spring.datasource.username=root
#数据库用户密码
spring.datasource.password=123456
#映射文件的位置
mybatis.mapper-locations=classpath:com/springboot/dao/*Dao.xml
#类型别名
mybatis.type-aliases-package=com.springboot.entity
#####Thymeleaf配置文件
spring.thymeleaf.cache=false
spring.thymeleaf.mode=HTML
#编码
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.check-template=true
#类型
spring.thymeleaf.servlet.content-type=text/html
#前缀
spring.thymeleaf.prefix=classpath:/templates/
#后缀
spring.thymeleaf.suffix=.html
#日志
logging.level.root=info
logging.level.com.springboot.dao=debug

三、Controller

package com.springboot.controller;

import com.springboot.servie.CarService;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;

@Controller
public class CarController {
    @Autowired
    private CarService carService;

    @RequestMapping("/index")
    public String carList() {
        return "index";
    }

    // 将excel导入到数据库
    @RequestMapping("/insertCarByExcel")
    public ModelAndView insertCarByExcel(@RequestParam("file") MultipartFile multipartFile) {
        ModelAndView modelAndView = new ModelAndView("complete");
        Integer integer = carService.insertCarByExcel(multipartFile);
        if (integer > 0) {
            modelAndView.addObject("msg", "通过Excel插入成功！");
            return modelAndView;
        }
        modelAndView.addObject("msg", "通过Excel插入失败！");
        return modelAndView;
    }

    // 将数据库导出成excel
    @RequestMapping("/exportCarByExcel")
    public void exportCarByExcel(HttpServletResponse response) {
        HSSFWorkbook workbook = carService.exportExcel();
        // 获取输出流
        OutputStream os = null;
        try {
            // 获取输出流
            os = response.getOutputStream();
            // 重置输出流
            response.reset();
            // 设定输出文件头
            response.setHeader("Content-disposition",
                    "attachment; filename=" + new String("car".getBytes("GB2312"), "8859_1") + ".xls");
            // 定义输出类型
            response.setContentType("application/msexcel");
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                assert os != null;
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

四、CarService

package com.springboot.servie;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.web.multipart.MultipartFile;

public interface CarService {

    Integer insertCarByExcel(MultipartFile multipartFile);

    HSSFWorkbook exportExcel();
}

五、CarServiceImpl

package com.springboot.servie.impl;

import com.springboot.dao.CarDao;
import com.springboot.entity.Car;
import com.springboot.servie.CarService;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

@Service
public class CarServiceImpl implements CarService {
    @Autowired
    private CarDao carDao;

    @Override
    public Integer insertCarByExcel(MultipartFile multipartFile) {
        List<Car> carList = new ArrayList<>();
        try {
            // 创建都Excel工作簿文件的引用
            XSSFWorkbook sheets = new XSSFWorkbook(multipartFile.getInputStream());
            // 获取Excel工作表总数
            int numberOfSheets = sheets.getNumberOfSheets();
            for (int i = 0; i < numberOfSheets; i++) {
                XSSFSheet sheet = sheets.getSheetAt(i);
                for (int j = 1; j < sheet.getLastRowNum() + 1; j++) {
                    Car car = new Car();
                    for (int k = 1; k < sheet.getRow(j).getPhysicalNumberOfCells(); k++) {
                        DataFormatter dataFormatter = new DataFormatter();
                        String stringCellValue = dataFormatter.formatCellValue(sheet.getRow(j).getCell(k));
                        switch (k) {
                            case 1:
                                car.setName(stringCellValue);
                                break;
                            case 2:
                                car.setPrice(Integer.parseInt(stringCellValue));
                                break;
                            case 3:
                                car.setColour(stringCellValue);
                                break;
                            case 4:
                                car.setBrand(stringCellValue);
                                break;
                        }
                    }
                    carList.add(car);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return carDao.insertCar(carList);
    }

    @Override
    public HSSFWorkbook exportExcel() {
        // 创建Execl工作薄
        HSSFWorkbook hssfWorkbook = new HSSFWorkbook();
        // 在Excel工作簿中建一工作表
        HSSFSheet sheet = hssfWorkbook.createSheet("car");
        HSSFRow row = sheet.createRow(0);
        row.createCell(0).setCellValue(new HSSFRichTextString("主键(id)"));
        row.createCell(1).setCellValue(new HSSFRichTextString("名称(name)"));
        row.createCell(2).setCellValue(new HSSFRichTextString("价格(price)"));
        row.createCell(3).setCellValue(new HSSFRichTextString("颜色(colour)"));
        row.createCell(4).setCellValue(new HSSFRichTextString("品牌(brand)"));
        List<Car> cars = carDao.carList();
        Iterator<Car> iterator = cars.iterator();
        int num = 1;
        while (iterator.hasNext()) {
            Car car = iterator.next();
            HSSFRow rowNum = sheet.createRow(num);
            rowNum.createCell(0).setCellValue(new HSSFRichTextString(car.getId().toString()));
            rowNum.createCell(1).setCellValue(new HSSFRichTextString(car.getName()));
            rowNum.createCell(2).setCellValue(new HSSFRichTextString(car.getPrice().toString()));
            rowNum.createCell(3).setCellValue(new HSSFRichTextString(car.getColour()));
            rowNum.createCell(4).setCellValue(new HSSFRichTextString(car.getBrand()));
            num++;
        }
        return hssfWorkbook;
    }
}

六、CarDao

package com.springboot.dao;

import com.springboot.entity.Car;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
@Mapper
public interface CarDao {
    /**
     * 查询全部的车信息
     *
     * @return
     */
    List<Car> carList();

    /**
     * 批量添加车信息
     *
     * @param cars
     * @return
     */
    Integer insertCar(List<Car> cars);
}

七、CarDao.xml

<?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.springboot.dao.CarDao">
    <select id="carList" resultType="car">
        select id,name,price,colour,brand from car
    </select>
    <insert id="insertCar">
        insert into car values
        <foreach collection="list" separator="," item="item">
            (0,#{item.name},#{item.price},#{item.colour},#{item.brand})
        </foreach>
    </insert>
</mapper>

八、Entity

package com.springboot.entity;

import lombok.Data;

@Data
public class Car {
    private Integer id;
    private String name;
    private Integer price;
    private String colour;
    private String brand;
}

九、前端

1、car.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
<h1>导入的excel表头必须和数据库字段一致</h1>
<form action="/springboot/insertCarByExcel" enctype="multipart/form-data" method="post">
    <input type="file" name="file">
    <input type="submit" value="导入"/>
</form>
<br>
<input type="button" value="导出" onclick="exportExcel()"/>
<script>
    function exportExcel() {
        window.location.href = "/springboot/exportCarByExcel"
    }
</script>
</body>
</html>

2、success.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>success</title>
</head>
<body>
<h1>success</h1>
<h1 th:text="${msg}"></h1>
</body>
</html>

十、数据库脚本

DROP TABLE IF EXISTS `car`;
CREATE TABLE `car` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `name` varchar(255) DEFAULT NULL COMMENT '名称',
  `price` int(11) DEFAULT NULL COMMENT '价格',
  `colour` varchar(255) DEFAULT NULL COMMENT '颜色',
  `brand` varchar(255) DEFAULT NULL COMMENT '品牌',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COMMENT='汽车';
LOCK TABLES `car` WRITE;
INSERT INTO `car` VALUES (1,'东风',150,'黑色','东风'),(2,'丰田',100,'白色','丰田'),(3,'本田',120,'蓝色','本田'),(4,'东风',150,'黑色','东风'),(5,'丰田',100,'白色','丰田'),(6,'本田',120,'蓝色','本田'),(7,'东风',150,'黑色','东风');
UNLOCK TABLES;