SpringBoot解析excel把数据保存到数据库

一、创建一个spring boot项目

1.1 开发工具 idea

1.2 jdk 1.8

1.3 具体项目搭建流程可以阅读我的另一篇博客（创建spring boot项目）

1.4 整体结构

SpringBoot解析excel把数据保存到数据库

二、搭建spring boot开发环境

2.1 添加pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.liyh</groupId>
    <artifactId>springboot_excel</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>springboot_excel</name>
    <description>study springboot_excel</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <!--jdbc 数据库连接-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!-- 引入阿里数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- mybatisPlus 核心库 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>
        <dependency>
            <groupId>net.sourceforge.nekohtml</groupId>
            <artifactId>nekohtml</artifactId>
            <version>1.9.15</version>
        </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>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.10</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
        </resources>
    </build>

</project>

pom.xml

2.2 配置application.yml文件

# 配置端口
server:
  port: 8086

spring:
  # 配置数据源
  datasource:
    url: jdbc:mysql://localhost:3306/db1?useSSL=false&serverTimezone=UTC
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver

  thymeleaf:
    mode: LEGACYHTML5
    # 取消模板文件缓存
    cache: false

  #设定thymeleaf文件路径 默认为src/main/resources/templates
  freemarker:
    template-loader-path: classpath:/templates

  #设定静态文件路径，js,css等
  mvc:
    static-path-pattern: /static/**

  servlet:
    multipart:
      # 设置单个文件大小
      max-file-size: 200MB
      # 设置单次请求文件的总大小
      max-request-size: 200MB

# mybatis-plus相关配置
mybatis-plus:
  # xml扫描，多个目录用逗号或者分号分隔（告诉 Mapper 所对应的 XML 文件位置）
  mapper-locations: classpath*:com/liyh/mapper/xml/*.xml
  configuration:
    # 是否开启自动驼峰命名规则映射:从数据库列名到Java属性驼峰命名的类似映射
    map-underscore-to-camel-case: true

#打印sql，保存到文件
logging:
  level:
    com.liyh.mapper: debug

2.3 编写摸板文件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<hr/>
<p>摸板下载</p>
<a href="/excel/download">下载摸板</a>
<hr/>
<p>文件上传</p>
<form action="/excel/import" method="POST" enctype="multipart/form-data">
    文件：<input type="file" name="file"/>
    <input type="submit"/>
</form>
<hr/>
</body>
</html>

2.4 创建IndexController，FileController

package com.liyh.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Author: liyh
 * @Date: 2020/10/23 17:33
 */

@Controller
public class IndexController {

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

package com.liyh.controller;

import com.liyh.entity.Result;
import com.liyh.service.ExcelService;
import com.liyh.utils.ExcelTool;
import com.liyh.utils.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 接口
 *
 * @Author: liyh
 * @Date: 2020/10/23 17:05
 */

@RestController
@RequestMapping("/excel")
public class ExcelController {

    Logger logger = LoggerFactory.getLogger(ExcelController.class);

    @Autowired
    private ExcelService excelService;

    @PostMapping("/import")
    public Result importProject(MultipartFile file) {
        String postfix = ExcelTool.getPostfix(file.getOriginalFilename());

        if (!"xlsx".equals(postfix) && !"xls".equals(postfix)) {
            return Result.error("导入失败，请选择正确的文件格式支持xlsx或xls");
        }
        return excelService.importProject(file);
    }

    @GetMapping("/download")
    public String downloadFile(HttpServletRequest request, HttpServletResponse response) {
        String fileName = "template.xlsx";
        String result = FileUtils.downloadFiles(request, response, fileName);
        if (request == null) {
            return null;
        }
        return result;
    }
}

2.4 文件工具类

package com.liyh.utils;

import org.springframework.core.io.ClassPathResource;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;

/**
 * @Author: liyh
 * @Date: 2020/11/4 16:10
 */

public class FileUtils {

    /**
     * 下载文件
     * @param request
     * @param response
     * @param fileName
     * @return
     * @throws IOException
     */
    public static String downloadFiles(HttpServletRequest request, HttpServletResponse response, String fileName){

        if (StringUtils.isEmpty(fileName)) {
            return "文件名称为空";
        }

        //设置文件路径
        ClassPathResource classPathResource = new ClassPathResource("templates/" + fileName);
        File file = null;
        try {
            file = classPathResource.getFile();
        } catch (IOException e) {
            e.printStackTrace();
            return "文件不存在";
        }

        response.setHeader("content-type", "application/octet-stream");
        // 设置强制下载不打开
        response.setContentType("application/force-download");
        // 设置文件名
        response.addHeader("Content-Disposition", "attachment;fileName=" + fileName);

        byte[] buffer = new byte[1024];
        InputStream fis = null;
        BufferedInputStream bis = null;

        try {
            fis = new FileInputStream(file);
            bis = new BufferedInputStream(fis);
            OutputStream os = response.getOutputStream();
            int i = bis.read(buffer);
            while (i != -1) {
                os.write(buffer, 0, i);
                i = bis.read(buffer);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return "文件下载成功";
    }

    /**
     * 判断文件大小
     *
     * @param file  文件
     * @param size  限制大小
     * @param unit  限制单位（B,K,M,G）
     * @return
     */
    public static boolean checkFileSize(MultipartFile file, int size, String unit) {
        if (file.isEmpty() || StringUtils.isEmpty(size) || StringUtils.isEmpty(unit)) {
            return false;
        }
        long len = file.getSize();
        double fileSize = 0;
        if ("B".equals(unit.toUpperCase())) {
            fileSize = (double) len;
        } else if ("K".equals(unit.toUpperCase())) {
            fileSize = (double) len / 1024;
        } else if ("M".equals(unit.toUpperCase())) {
            fileSize = (double) len / 1048576;
        } else if ("G".equals(unit.toUpperCase())) {
            fileSize = (double) len / 1073741824;
        }
        if (fileSize > size) {
            return false;
        }
        return true;
    }
}

FileUtils