EasyExcel导入

方式一：
Controller层

 @PostMapping("/import")
    public Result<String> importDemo(HttpServletRequest request, @RequestParam("file") MultipartFile file) {
        log.info("import.request:{}", file.getOriginalFilename());
        if (file.getOriginalFilename() == null || !file.getOriginalFilename().endsWith("xlsx")) {
            throw new Exception("只支持.xlsx类型的文件导入!");
        }
        // 读取Excel内容
        List<DemoPo> demoList;
        try {
            ExcelImportPoSoAdapter adapter = new ExcelImportPoSoAdapter();
            EasyExcelFactory.read(file.getInputStream(), DemoPo.class, adapter).doReadAll();
            Map<String, String> map = adapter.getMap();
            if (map.size() != 0){
                throw  new BizException(map.get("msg"));
            }
            demoList= adapter.demoList();
        } catch (Exception e) {
            log.error("import.error:", e);
            throw new Exception("您上传的文件格式与模板格式不一致，请检查后重新上传");
        }
        if(demoList.size() > 500){
            throw new Exception("Excel数据超出限制, 最大支持导入500条!");
        }
        if (ObjectUtil.isEmpty(demoList)) {
            throw new Exception("导入数据为空，请添加数据后再次导入");
        }
        demoUserCase.save(request, demoList);
        log.info("import:success");
        return Result.buildResult(null);
    }

Excel适配器类

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
 
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
/**
 * Excel适配器
 */
@Slf4j
@Getter
public class ExcelImportPoSoAdapter extends AnalysisEventListener<ExcelPayload> {
    
    /**
     * 数据集合
     */
    List<DemoPo> demoPoList = new ArrayList<>();
 
    // 此map用来存储错误提示
    protected Map<String, String> map = new HashMap<>();
 
     /**
     * 校验表头
     */
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        // headMap.containsKey(下标)，先判空
        // headMap.get(0).equals() 判内容是否相符
        if (!headMap.containsKey(0) || !headMap.containsKey(1)
                || !headMap.get(0).equals("enmu1") || !headMap.get(1).equals("enmu2")) {
            // 这里给demoPoList 加1条空数据，是因为doAfterAllAnalysed方法最后有判是否是空列表
            demoPoList.add(new DemoPo());
            map.put("msg", "您上传的文件格式与模板格式不一致，请检查后重新上传");
        }
    }
    @Override
    public void invoke(ExcelPayload excelPayload, AnalysisContext analysisContext) {
        demoPoList .add(excelPayload.excelPayloadToDemoPo(excelPayload));
    }
 
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        log.info("ExcelImportAdapter.doAfterAllAnalysed.success");
    }
}

service
接着写业务的逻辑校验

执行批量导入

注：注意List切片，因为sql传入参数最大限制2100个

import com.google.common.collect.Lists;
上方为该Lists导包
List<List<DemoPo>> partition = Lists.partition(demoList, 100);

方式二：
1.项目依赖
demo项目基于springboot2.2.1版本。

<?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 http://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>2.2.1.RELEASE</version>
        <relativePath/>
    </parent>

    <groupId>com.evan.easyexcel</groupId>
    <artifactId>easyexcel-basic-demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>easyexcel-basic-demo</name>
    <description>Easy excel 2.x import and export demo</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-scratchpad</artifactId>
            <version>4.1.0</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.1.6</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

2.ExcelApplication 主启动类

package com.evan.easyexcel;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ExcelApplication {

    public static void main(String[] args) {
        SpringApplication.run(ExcelApplication.class, args);
    }
}

3.定义导入和导出模型

package com.evan.easyexcel.model;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.alibaba.excel.annotation.write.style.ContentRowHeight;
import com.alibaba.excel.annotation.write.style.HeadRowHeight;
import lombok.Data;

/**
 * @ClassName ExportModel
 * @Description 导出模型
 * @Author Evan Wang
 * @Version 1.0.0
 * @Date 2020/4/1 20:55
 */
@ContentRowHeight(20)
@HeadRowHeight(25)
@ColumnWidth(25)
@Data
public class ExportModel  {

    @ExcelProperty(value = "姓名" ,index = 0)
    private String name;

    @ExcelProperty(value = "性别" ,index = 1)
    private String sex;

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

}

package com.evan.easyexcel.model;

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

/**
 * @ClassName ImportModel
 * @Description 导入模型
 * @Author Evan Wang
 * @Version 1.0.0
 * @Date 2020/4/1 20:54
 */
@Data
public class ImportModel {

    @ExcelProperty(index = 0)
    private String date;

    @ExcelProperty(index = 1)
    private String author;

    @ExcelProperty(index = 2)
    private String book;

}

4.Object与实体类转换工具类

package com.evan.easyexcel.utils.common;

import org.springframework.beans.BeanUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @ClassName ExportModel
 * @Description Object与实体类转换工具类
 * @Author Evan Wang
 * @Version 1.0.0
 * @Date 2020/4/1 20:59
 */
public class BeanConvert {
    private BeanConvert(){}
    /**
     * 将List