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2022年8月我更新了新的导入导出方法更简单使用easyexcel实现Excel数据导入以及数据库数据导出成Excel

一、前期配置

1、依赖

        <!--SpringBoot整合easyExcel实现Excel的导入出-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.1.4</version>
        </dependency>
        <!-- mybatis-plus依赖-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>

二、使用步骤

1、Entity实体类

@ColumnWidth(30)//注释在具体属性上,设置单独列。注释在类上,统一设置列宽
@HeadRowHeight(30)//设置表头行高
@ContentRowHeight(20)//统一设置数据行行高
@ApiModel(value = "User对象", description = "")
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @ExcelProperty(value = "主键ID", index = 0)
    @ApiModelProperty(value = "主键ID")
    @TableId(value = "id", type = IdType.ASSIGN_ID)
    private Long id;

    @ExcelProperty(value = "姓名", index = 1)
    @ApiModelProperty(value = "姓名")
    private String name;

    @ExcelProperty(value = "年龄", index = 2)
    @ApiModelProperty(value = "年龄")
    private Integer age;

    @ExcelProperty(value = "邮箱", index = 3)
    @ApiModelProperty(value = "邮箱")
    private String email;

    @ExcelProperty(value = "创建时间", index = 4)
    @TableField(fill = FieldFill.INSERT)
    @ApiModelProperty(value = "创建时间")
    private Date createTime;

    @ExcelProperty(value = "最后修改时间", index = 5)
    @TableField(fill = FieldFill.INSERT_UPDATE)
    @ApiModelProperty(value = "最后修改时间")
    private Date updateTime;


    /**
     * 逻辑删除（0 未删除、1 删除）
     */
    @ExcelProperty(value = "逻辑删除", index = 6)
    @TableField(fill = FieldFill.INSERT)
    @ApiModelProperty(value = "逻辑删除（0 未删除、1 删除）")
    private Integer deleteFlag;

    @ExcelProperty(value = "最后修改时间", index = 7)
    @Version
    @TableField(fill = FieldFill.INSERT)
    @ApiModelProperty(value = "版本号（用于乐观锁， 默认为 1）")
    private Integer version;

    public Integer getVersion() {
        return version;
    }

    public void setVersion(Integer version) {
        this.version = version;
    }

    public static long getSerialVersionUID() {
        return serialVersionUID;
    }

    public Integer getDeleteFlag() {
        return deleteFlag;
    }

    public void setDeleteFlag(Integer deleteFlag) {
        this.deleteFlag = deleteFlag;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public Date getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", email='" + email + '\'' +
                ", createTime=" + createTime +
                ", updateTime=" + updateTime +
                ", deleteFlag=" + deleteFlag +
                '}';
    }
}

2、Mapper层

public interface UserMapper extends BaseMapper<User> {

}

3、自定义AnalysisEventListener

public class ExcelListener extends AnalysisEventListener {
    //可以通过实例获取该值
    private List<Object> datas = new ArrayList<Object>();

    @Override
    public void invoke(Object o, AnalysisContext analysisContext) {
        datas.add(o);//数据存储到list，供批量处理，或后续自己业务逻辑处理。
        doSomething(o);//根据自己业务做处理
    }

    private void doSomething(Object object) {
        //1、入库调用接口
    }

    public List<Object> getDatas() {
        return datas;
    }

    public void setDatas(List<Object> datas) {
        this.datas = datas;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        // datas.clear();//解析结束销毁不用的资源
    }
}

4、Controller层

package com.example.ceshi.controller;


import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.EasyExcelFactory;
import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.metadata.Sheet;
import com.alibaba.excel.support.ExcelTypeEnum;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.ceshi.entity.User;
import com.example.ceshi.mapper.UserMapper;
import com.example.ceshi.utils.ExcelListener;
import com.example.ceshi.utils.JsonData;
import org.springframework.beans.factory.annotation.Autowired;
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;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.List;

/**
 * <p>
 * 前端控制器
 * </p>
 *
 * @author lcy
 * @since 2021-02-25
 */
@RestController
public class UserController {

    @Autowired
    UserMapper userMapper;

    @RequestMapping("myImport")
    public JsonData myImport(MultipartFile file) {
        try {
            //获取文件名
            String filename = file.getOriginalFilename();
            //获取文件流
            InputStream inputStream = file.getInputStream();
            //实例化实现了AnalysisEventListener接口的类
            ExcelListener listener = new ExcelListener();

            EasyExcelFactory.read(inputStream, User.class, listener).headRowNumber(1).build().readAll();
            //获取数据
            List<Object> list = listener.getDatas();
            if (list.size() > 1) {
                for (int i = 0; i < list.size(); i++) {
                    User user = (User) list.get(i);
                    System.out.println(user.toString());
                    //使用mybatis-plus添加到数据库
                    userMapper.insert(user);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return JsonData.buildSuccess();
    }

    @RequestMapping("myExport")
    public void myExport(HttpServletResponse response, HttpServletRequest request) {

        try {
            String filenames = "111111";
            String userAgent = request.getHeader("User-Agent");
            if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
                filenames = URLEncoder.encode(filenames, "UTF-8");
            } else {
                filenames = new String(filenames.getBytes("UTF-8"), "ISO-8859-1");
            }
            response.setContentType("application/json.ms-exce");
            response.setCharacterEncoding("utf-8");
            response.addHeader("Content-Disposition", "filename=" + filenames + ".xlsx");

            // Step1：创建一个 QueryWrapper 对象
            QueryWrapper<User> queryWrapper = new QueryWrapper<>();

            // Step2： 构造查询条件
            queryWrapper
                    .select("*");

            // Step3：执行查询
            List<User> userList = userMapper.selectList(queryWrapper);

            EasyExcel.write(response.getOutputStream(), User.class).sheet("sheet").doWrite(userList);
        } catch (Exception e) {
            e.printStackTrace();
        }


    }


}

5、Util工具类

package com.example.ceshi.utils;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

import java.io.Serializable;

@ApiModel("接口实体类")
public class JsonData implements Serializable{

    /**
     * 状态码 0表示成功过，-1,-2,-3、、、为失败
     */
    @ApiModelProperty("状态码 0表示成功过，-1,-2,-3、、、为失败")
    private Integer code;

    /**
     * 业务数据
     */
    @ApiModelProperty("业务数据")
    private Object data;

    /**
     * 信息表示
     */
    @ApiModelProperty("信息表示")
    private String msg;

    public JsonData() {
    }

    public JsonData(Integer code, Object data, String msg) {
        this.code = code;
        this.data = data;
        this.msg = msg;
    }


    /**
     * 成功，不用返回数据
     *
     * @return
     */
    public static JsonData buildSuccess() {
        return new JsonData(0, null, null);
    }

    /**
     * 成功，返回数据
     *
     * @param data
     * @return
     */
    public static JsonData buildSuccess(Object data) {
        return new JsonData(0, data, null);
    }

    /**
     * 成功，返回数据
     *
     * @param msg
     * @return
     */
    public static JsonData buildSuccess(String msg) {
        return new JsonData(0, null, msg);
    }

    /**
     * 成功，返回数据，信息
     * @param data
     * @param msg
     * @return
     */
    public static JsonData buildSuccess(Object data,String msg) {
        return new JsonData(0, data, msg);
    }


    /**
     * 失败，固定状态码
     *
     * @param msg
     * @return
     */
    public static JsonData buildError(String msg) {
        return new JsonData(-1, null, msg);
    }


    /**
     * 失败，自定义错误码和信息
     *
     * @param code
     * @param msg
     * @return
     */
    public static JsonData buildError(Integer code, String msg) {
        return new JsonData(code, null, msg);
    }


    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

三、数据与接口截图

1、Excel

2、数据库中信息

3、批量导入接口

4、批量导出Excel接口

四、下载地址

需要代码我已经上传啦
下载地址